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Journal articles on the topic 'Bifunctional Electrocatalyst'

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Author: Grafiati
Published: 6 September 2023

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1

Karuppiah, Chelladurai, Balamurugan Thirumalraj, Srinivasan Alagar, Shakkthivel Piraman, Ying-Jeng Jame Li, and Chun-Chen Yang. "Solid-State Ball-Milling of Co3O4 Nano/Microspheres and Carbon Black Endorsed LaMnO3 Perovskite Catalyst for Bifunctional Oxygen Electrocatalysis." Catalysts 11, no. 1 (January 7, 2021): 76. http://dx.doi.org/10.3390/catal11010076.

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Developing a highly stable and non-precious, low-cost, bifunctional electrocatalyst is essential for energy storage and energy conversion devices due to the increasing demand from the consumers. Therefore, the fabrication of a bifunctional electrocatalyst is an emerging focus for the promotion and dissemination of energy storage/conversion devices. Spinel and perovskite transition metal oxides have been widely explored as efficient bifunctional electrocatalysts to replace the noble metals in fuel cell and metal-air batteries. In this work, we developed a bifunctional catalyst for oxygen reduction and oxygen evolution reaction (ORR/OER) study using the mechanochemical route coupling of cobalt oxide nano/microspheres and carbon black particles incorporated lanthanum manganite perovskite (LaMnO3@C-Co3O4) composite. It was synthesized through a simple and less-time consuming solid-state ball-milling method. The synthesized LaMnO3@C-Co3O4 composite was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, Brunauer-Emmett-Teller (BET) analysis, X-ray diffraction spectroscopy, and micro-Raman spectroscopy techniques. The electrocatalysis results showed excellent electrochemical activity towards ORR/OER kinetics using LaMnO3@C-Co3O4 catalyst, as compared with Pt/C, bare LaMnO3@C, and LaMnO3@C-RuO2 catalysts. The observed results suggested that the newly developed LaMnO3@C-Co3O4 electrocatalyst can be used as a potential candidate for air-cathodes in fuel cell and metal-air batteries.
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2

Karuppiah, Chelladurai, Balamurugan Thirumalraj, Srinivasan Alagar, Shakkthivel Piraman, Ying-Jeng Jame Li, and Chun-Chen Yang. "Solid-State Ball-Milling of Co3O4 Nano/Microspheres and Carbon Black Endorsed LaMnO3 Perovskite Catalyst for Bifunctional Oxygen Electrocatalysis." Catalysts 11, no. 1 (January 7, 2021): 76. http://dx.doi.org/10.3390/catal11010076.

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Developing a highly stable and non-precious, low-cost, bifunctional electrocatalyst is essential for energy storage and energy conversion devices due to the increasing demand from the consumers. Therefore, the fabrication of a bifunctional electrocatalyst is an emerging focus for the promotion and dissemination of energy storage/conversion devices. Spinel and perovskite transition metal oxides have been widely explored as efficient bifunctional electrocatalysts to replace the noble metals in fuel cell and metal-air batteries. In this work, we developed a bifunctional catalyst for oxygen reduction and oxygen evolution reaction (ORR/OER) study using the mechanochemical route coupling of cobalt oxide nano/microspheres and carbon black particles incorporated lanthanum manganite perovskite (LaMnO3@C-Co3O4) composite. It was synthesized through a simple and less-time consuming solid-state ball-milling method. The synthesized LaMnO3@C-Co3O4 composite was characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, Brunauer-Emmett-Teller (BET) analysis, X-ray diffraction spectroscopy, and micro-Raman spectroscopy techniques. The electrocatalysis results showed excellent electrochemical activity towards ORR/OER kinetics using LaMnO3@C-Co3O4 catalyst, as compared with Pt/C, bare LaMnO3@C, and LaMnO3@C-RuO2 catalysts. The observed results suggested that the newly developed LaMnO3@C-Co3O4 electrocatalyst can be used as a potential candidate for air-cathodes in fuel cell and metal-air batteries.
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3

Madan, Chetna, and Aditi Halder. "Nonprecious Multi-Principal Metal Systems As the Air Electrode for a Solid-State Rechargeable Zinc-Air Battery." ECS Meeting Abstracts MA2022-02, no. 64 (October 9, 2022): 2327. http://dx.doi.org/10.1149/ma2022-02642327mtgabs.

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Zinc-air battery technology is gaining recognition as a promising energy storage device to be used in portable electronics and electric vehicles. Despite possessing high theoretical energy density, environmental and operational safety, and easy accessibility of zinc reservoirs, the successful commercialization of zinc-air batteries suffers due to the poor oxygen electrocatalysis kinetics at the air cathode. The kinetically inept oxygen reduction and oxygen evolution reactions at the cathode lead to a large overpotential barrier and poor charge-discharge cyclic performance of the rechargeable zinc-air battery. This work demonstrates designing a multi-principal metal bifunctional electrocatalyst that is directly deposited on conductive, porous, and flexible substrates to eliminate the necessity of polymeric binders. The flexible bifunctional oxygen electrocatalyst used for the cathode of solid-state ZAB is assembled with gel polymer electrolyte and zinc anode giving excellent charge-discharge cyclic stability and constant discharge voltage (close to 1.65 V). These multi-principal metal electrocatalysts constituting quasi-equimolar concentration, provide numerous combinations of surface functionality, multiple adsorption sites, and electronic environments thus enabling better optimization of the catalytic performance.
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4

Gaolatlhe, Lesego, Augustus Kelechi Lebechi, Aderemi Bashiru Haruna, Thapelo Prince Mofokeng, Patrick Vaati Mwonga, and Kenneth Ikechukwu Ozoemena. "High Entropy Spinel Oxide As a Bifunctional Electrocatalyst for Rechargeable Zinc-Air Battery." ECS Meeting Abstracts MA2022-02, no. 7 (October 9, 2022): 2419. http://dx.doi.org/10.1149/ma2022-0272419mtgabs.

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Rechargeable zinc-air battery (RZAB) represents one of the ‘beyond-the-lithium-ion’ battery technologies with great potential for renewable energy storage. It is safe, environmentally benign, and excellent potential for affordable applications in resource-limited countries, ranging from residential and industrial electricity supply, transport (e.g., electric vehicles) to mobile and consumer electronics markets. RZABs possess high theoretical specific energy density of 1086 Wh/kg, which is 5 times greater than that of the conventional lithium-ion battery (LIB). The key challenge that conspires against the widespread commercialization of RZAB is the sluggish oxygen reaction kinetics that impedes reversibility of the system. Thus, it has become quite critical to develop low-cost and high-performance bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) [1,2]. High entropy materials (HEMs) have emerged as electrocatalysts for ORR and OER. HEMs contain five or more metals in equal proportions. Their unique conformational entropy and physico-chemical properties (including lattice distortion, synergistic effects amongst the different metals, and rich defect chemistries) promise to improve the kinetics of ORR / OER and electrochemical cycling stability. In this work, the high entropy spinel oxide, (CoCuFeMnNi)3O4 supported on conductive carbon has been synthesized and characterised using XRD, XPS, HRTEM, SEM and others. Preliminary electrochemistry shows improved ORR/OER kinetics. This presentation will discuss the performance of the initial lab-based RZAB using this electrocatalyst. References AB Haruna and KI Ozoemena, Manganese-based bifunctional electrocatalysts for zinc-air batteries, Opin. Electrochem. 2020, 21, 219-224 AK Ipadeola, AB Haruna, L Gaolatlhe, AK Lebechi, J Meng, QQ Pang, K Eid, AM Abdullah, and KI Ozoemena, Efforts at Enhancing Bifunctional Electrocatalysis and Related Events for Rechargeable Zinc-Air Batteries; ChemElectroChem 2021, 8, 3998-4018
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5

Zhang, Tian, Bikun Zhang, Qiong Peng, Jian Zhou, and Zhimei Sun. "Mo2B2 MBene-supported single-atom catalysts as bifunctional HER/OER and OER/ORR electrocatalysts." Journal of Materials Chemistry A 9, no. 1 (2021): 433–41. http://dx.doi.org/10.1039/d0ta08630d.

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6

Qin, Xupeng, Oluwafunmilola Ola, Jianyong Zhao, Zanhe Yang, Santosh K. Tiwari, Nannan Wang, and Yanqiu Zhu. "Recent Progress in Graphene-Based Electrocatalysts for Hydrogen Evolution Reaction." Nanomaterials 12, no. 11 (May 25, 2022): 1806. http://dx.doi.org/10.3390/nano12111806.

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Hydrogen is regarded as a key renewable energy source to meet future energy demands. Moreover, graphene and its derivatives have many advantages, including high electronic conductivity, controllable morphology, and eco-friendliness, etc., which show great promise for electrocatalytic splitting of water to produce hydrogen. This review article highlights recent advances in the synthesis and the applications of graphene-based supported electrocatalysts in hydrogen evolution reaction (HER). Herein, powder-based and self-supporting three-dimensional (3D) electrocatalysts with doped or undoped heteroatom graphene are highlighted. Quantum dot catalysts such as carbon quantum dots, graphene quantum dots, and fullerenes are also included. Different strategies to tune and improve the structural properties and performance of HER electrocatalysts by defect engineering through synthetic approaches are discussed. The relationship between each graphene-based HER electrocatalyst is highlighted. Apart from HER electrocatalysis, the latest advances in water electrolysis by bifunctional oxygen evolution reaction (OER) and HER performed by multi-doped graphene-based electrocatalysts are also considered. This comprehensive review identifies rational strategies to direct the design and synthesis of high-performance graphene-based electrocatalysts for green and sustainable applications.
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7

Singh, Harish, McKenzie Marley Hines, Shatadru Chakravarty, and Manashi Nath. "Multi-Walled Carbon Nanotube Supported Manganese Selenide As Highly Active Bifunctional OER and ORR Electrocatalyst." ECS Meeting Abstracts MA2022-01, no. 34 (July 7, 2022): 1376. http://dx.doi.org/10.1149/ma2022-01341376mtgabs.

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Transition metal selenides have attracted intensive interest as cost-effective electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) because of the continuous thrust in sustainable energy conversion. In this article a Mn-based bifunctional electrocatalyst, MnSe has been identified which shows efficient OER and ORR activity in alkaline medium. The catalytic activity could be further enhanced by using multiwalled carbon nanotubes (MWCNT) asadditives which increases the charge transfer and electronic conductivity of the catalyst composite. This MnSe@MWCNT catalyst composite exhibits a very low overpotential of 210 mV at 50 mA cm-2 when deposited on Ni foam, which outperforms state-of-the-art RuO2 as well as other oxide and Mn-based electrocatalysts. Furthermore, the composite’s facile OER kinetics was evidenced by its small Tafel slope of 54.76 mV dec–1 and low charge transfer resistance, indicating quick transport of the reactant species. The MnSe@MWCNT also exhibited efficient electrocatalytic activity for ORR with a Eonset of 0.94 V, which is among the best reported till date for chalcogenide based ORR electrocatalysts. More importantly, this MnSe-based ORR electrocatalyst exhibits high degree of methanol tolerance, showing no degradation of catalyst performance in presence of copious quantities of methanol, thereby out-performing state-of-the-art Pt electrocatalyst. The catalyst compositie also exhibited exceptional functional and compositional stability for OER and ORR after prolonged period of continuous operation in alkaline medium. The surface Raman analysis after OER revealed the retention of manganese selenide surface with evidence of Mn-oxo coordination confirming the formation of mixed anionic (oxy)selenide as the active surface for OER. Such efficient bifunctional OER and ORR activity makes this MnSe based catalyst attractive for overall electrolysis in regenerative as well as direct methanol fuel cells.
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8

Jeon, Jaeeun, Kyoung Ryeol Park, Kang Min Kim, Daehyeon Ko, HyukSu Han, Nuri Oh, Sunghwan Yeo, Chisung Ahn, and Sungwook Mhin. "CoFeS2@CoS2 Nanocubes Entangled with CNT for Efficient Bifunctional Performance for Oxygen Evolution and Oxygen Reduction Reactions." Nanomaterials 12, no. 6 (March 16, 2022): 983. http://dx.doi.org/10.3390/nano12060983.

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Exploring bifunctional electrocatalysts to lower the activation energy barriers for sluggish electrochemical reactions for both the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are of great importance in achieving lower energy consumption and higher conversion efficiency for future energy conversion and storage system. Despite the excellent performance of precious metal-based electrocatalysts for OER and ORR, their high cost and scarcity hamper their large-scale industrial application. As alternatives to precious metal-based electrocatalysts, the development of earth-abundant and efficient catalysts with excellent electrocatalytic performance in both the OER and the ORR is urgently required. Herein, we report a core–shell CoFeS2@CoS2 heterostructure entangled with carbon nanotubes as an efficient bifunctional electrocatalyst for both the OER and the ORR. The CoFeS2@CoS2 nanocubes entangled with carbon nanotubes show superior electrochemical performance for both the OER and the ORR: a potential of 1.5 V (vs. RHE) at a current density of 10 mA cm−2 for the OER in alkaline medium and an onset potential of 0.976 V for the ORR. This work suggests a processing methodology for the development of the core–shell heterostructures with enhanced bifunctional performance for both the OER and the ORR.
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9

Wang, Chengcheng, Ziheng Zheng, Zian Chen, Xinlei Luo, Bingxue Hou, Mortaza Gholizadeh, Xiang Gao, Xincan Fan, and Zanxiong Tan. "Enhancement on PrBa0.5Sr0.5Co1.5Fe0.5O5 Electrocatalyst Performance in the Application of Zn-Air Battery." Catalysts 12, no. 7 (July 20, 2022): 800. http://dx.doi.org/10.3390/catal12070800.

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Due to the insufficient stability and expensive price of commercial precious metal catalysts like Pt/C and IrO2, it is critical to study efficiently, stable oxygen reduction reaction as well as oxygen evolution reaction (ORR/OER) electrocatalysts of rechargeable Zn-air batteries. PrBa0.5Sr0.5Co1.5Fe0.5O5 (PBSCF) double perovskite was adopted due to its flexible electronic structure as well as higher electro catalytic activity. In this study, PBSCF was prepared by the citrate-EDTA method and the optimized amount of PBSCF-Pt/C composite was used as a potential ORR/OER bifunctional electrocatalyst in 0.1 M KOH. The optimized composite exhibited excellent OER intrinsic activity with an onset potential of 1.6 V and Tafel slope of 76 mV/dec under O2-saturated 0.1 M KOH. It also exhibited relatively competitive ORR activity with an onset potential of 0.9 V and half-wave potential of 0.78 V. Additionally, Zn–air battery with PBSCF composite catalyst showed relatively good stability. All these results illustrate that PBSCF-Pt/C composite is a promising bifunctional electrocatalyst for rechargeable Zn-air batteries.
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10

Liang, Yunxia, Qiaojuan Gong, Xiaoling Sun, Nengneng Xu, Pengni Gong, and Jinli Qiao. "Fabrication of CoMN2O4 loaded nitrogen-doped graphene as bifunctional electrocatalyst for rechargeable zinc-air batteries." Functional Materials Letters 13, no. 08 (November 2020): 2051046. http://dx.doi.org/10.1142/s1793604720510467.

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Designing durable and low-cost electrocatalysts for zinc-air batteries is critical, which plays an essential role in oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In this paper, the CoMn2O4/N-RGO bifunctional electrocatalyst was synthesized by a facile hydrothermal method. The electrocatalytic performance was tested toward ORR and OER under alkaline condition (0.1[Formula: see text]M KOH). The XRD, SEM and other characterization analyses were used to investigate the physicochemical properties of materials. The results showed that the electrochemical activity of CoMn2O4/N-RGO showed high power density (354[Formula: see text]mW[Formula: see text]cm[Formula: see text], small charge/discharge voltage drop (0.70[Formula: see text]V) and excellent stability cycle (200[Formula: see text]h), which are superior to the noble metal Pt/C+IrO2 electrocatalyst (the voltage drop: 0.60[Formula: see text]V at initial and 0.85[Formula: see text]V after 13[Formula: see text]h). This work provided a new method for developing the bifunctional material in zinc-air batteries.
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11

Wang, Fan, Rui Tian, Xingzhong Guo, Yang Hou, Chang Zou, and Hui Yang. "Construction of Petal-Like Ag NWs@NiCoP with Three-Dimensional Core-Shell Structure for Overall Water Splitting." Nanomaterials 12, no. 7 (April 4, 2022): 1205. http://dx.doi.org/10.3390/nano12071205.

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High-efficiency, good electrical conductivity and excellent performance electrocatalysts are attracting growing attention in the field of overall water splitting. In order to achieve the desirable qualities, rational construction of the structure and chemical composition of electrocatalysts is of fundamental importance. Herein, petal-like structure Ni0.33Co0.67P shells grown on conductive silver nanowires (Ag NWs) cores as bifunctional electrocatalysts for overall water splitting were synthesized through a facile hydrothermal method and phosphorization. The resultant three-dimensional core-shell petal-like structure Ag NWs@Ni0.33Co0.67P possesses excellent catalytic activities in alkaline conditions with the overpotential of 259 mV for the oxygen evolution reaction (OER), 121 mV for the hydrogen evolution reaction (HER) and a full cell voltage of 1.64 V to reach the current density of 10 mA cm−2. Highly conductive Ag NWs as cores and high surface area petal-like Ni0.33Co0.67P as shells can endow outstanding catalytic performance for the bifunctional electrocatalyst. Thus, the synthetic strategy of the three-dimensional core-shell structure Ag NWs@Ni0.33Co0.67P considerably advances the practice of Ag NWs toward electrocatalysts.
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12

Luo, Wen-Bin, Shu-Lei Chou, Jia-Zhao Wang, and Hua-Kun Liu. "A B4C nanowire and carbon nanotube composite as a novel bifunctional electrocatalyst for high energy lithium oxygen batteries." Journal of Materials Chemistry A 3, no. 36 (2015): 18395–99. http://dx.doi.org/10.1039/c5ta04374c.

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13

Chen, Jun Jie, and De Guang Xu. "Recent Development and Applications in Electrodes for URFC." International Letters of Chemistry, Physics and Astronomy 47 (February 2015): 165–77. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.47.165.

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The design of electrodes for URFC (unitised regenerative polymer electrolyte fuel cells) requires a delicate balancing of transport media. Gas transport, electrons and protons must be carefully optimised to provide efficient transport to and from the electrochemical reaction sites. This review is a survey of recent literature with the objective to identify common components and design and assembly methods for URFC electrodes, focusing primarily on the development of a better performing bifunctional electrocatalyst for the oxygen reduction and water oxidation. Advances in unitised regenerative fuel cells study have yielded better performing oxygen electrocatalysts capable of improving energy efficiency with longer endurance and less performance degradation over time. Fuel cells using these electrocatalyst have a possible future as a source of energy.
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Chen, Jun Jie, and De Guang Xu. "Recent Development and Applications in Electrodes for URFC." International Letters of Chemistry, Physics and Astronomy 47 (February 24, 2015): 165–77. http://dx.doi.org/10.56431/p-o13q11.

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The design of electrodes for URFC (unitised regenerative polymer electrolyte fuel cells) requires a delicate balancing of transport media. Gas transport, electrons and protons must be carefully optimised to provide efficient transport to and from the electrochemical reaction sites. This review is a survey of recent literature with the objective to identify common components and design and assembly methods for URFC electrodes, focusing primarily on the development of a better performing bifunctional electrocatalyst for the oxygen reduction and water oxidation. Advances in unitised regenerative fuel cells study have yielded better performing oxygen electrocatalysts capable of improving energy efficiency with longer endurance and less performance degradation over time. Fuel cells using these electrocatalyst have a possible future as a source of energy.
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15

Kagkoura, Antonia, Raul Arenal, and Nikos Tagmatarchis. "Sulfur-Doped Carbon Nanohorn Bifunctional Electrocatalyst for Water Splitting." Nanomaterials 10, no. 12 (December 3, 2020): 2416. http://dx.doi.org/10.3390/nano10122416.

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Sulfur-doped carbon nanohorns (S-CNHs) were prepared by an easy one-pot solvothermal process and were employed as efficient electrocatalysts towards water splitting. Initially, oxidation of CNHs followed by thermal treatment with the Lawesson’s reagent resulted in the formation of S-CNHs with the sulfur content determined as high as 3%. The S-CNHs were thoroughly characterized by spectroscopic, thermal and electron microscopy imaging means and then electrocatalytically screened. Specifically, S-CNHs showed excellent activity and durability for both O2 and H2 evolution reactions, by showing low overpotential at 1.63 and −0.2 V vs. RHE for oxygen and hydrogen evolution reaction, respectively. Additionally, S-CNHs showed significantly lower Tafel slope value and lower current resistance compared to oxidized and pristine CNHs for both electrocatalytic reactions. The outstanding electrocatalytic properties and high conductivity, along with the high S-doping level, render S-CNHs a promising bifunctional electrocatalyst for water splitting.
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16

Sachdeva, Parrydeep Kaur, Shuchi Gupta, and Chandan Bera. "Designing an efficient bifunctional electrocatalyst heterostructure." Chemical Communications 57, no. 74 (2021): 9426–29. http://dx.doi.org/10.1039/d1cc02492b.

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Doped graphene and Janus molybdenum dichalcogenide heterostructures form efficient bifunctional electrocatalysts for oxygen and hydrogen evolutions with boosted electron transport at the heterojunction.
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17

Alimbekova, Amina, Akmal Kosimov, Gulnara Yusibova, Jaan Aruväli, Maike Käärik, Jaan Leis, and Nadezda Kongi. "Sacrificial Template-Assisted Mechanochemical Production of Highly Active Bifunctional Fe-N-C Catalysts." ECS Meeting Abstracts MA2022-01, no. 35 (July 7, 2022): 1475. http://dx.doi.org/10.1149/ma2022-01351475mtgabs.

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Bifunctional catalyst materials development for energy storage and conversion technologies is notoriously demanding in terms of electrochemistry (low stability, sluggish kinetics and high total overpotential (∆E)) and logistics (environmental safety, production methodologies and cost). Noble metal electrocatalysts are proven to be good bifunctional catalysts and as a result are being used as benchmark catalysts. However, the environmental and economic sustainability is severely compromised due to the scarcity of these metals. The alternative option is based on first-row transition metal heteroatom-doped carbon materials. Low cost, high availability, great electrocatalytic activity and stability promise to be a suitable noble metal free catalyst for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). This work showcases a high performance Fe-N-C type material with sustainable synthesis and efficient activity towards ORR and OER. Unlike various classical methods for electrocatalyst synthesis, the developed methodology combines mechanochemistry and application of sacrificial template, which yields materials with superior bifunctional oxygen electrocatalytic performance.
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18

He, Xiong, Jiayang Cai, Jie Zhou, Qiyi Chen, Qijun Zhong, Jinghua Liu, Zijun Sun, Dezhi Qu, and Yudong Li. "Facile Electrochemical Synthesis of Bifunctional Needle-like Co-P Nanoarray for Efficient Overall Water Splitting." Molecules 28, no. 16 (August 17, 2023): 6101. http://dx.doi.org/10.3390/molecules28166101.

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The development of low-cost and high-performance bifunctional electrocatalysts for overall water splitting is still challenging. Herein, we employed a facile electrodeposition method to prepare bifunctional cobalt phosphide for overall water splitting. The needle-like cobalt phosphide (Co-P-1) nanoarray is uniformly distributed on nickel foam. Co-P-1 exhibits excellent electrocatalytic activity for hydrogen evolution reaction (HER, 85 mV at 10 mA/cm2, 60 mV/dec) and oxygen evolution reaction (OER, 294 mV at 50 mA/cm2, 60 mV/dec). The cell-voltage of 1.60 V is found to achieve the current density of 10 mA/cm2 for overall water splitting in the two-electrode system, comparable to that of previously reported Pt/C/NF||RuO2/NF. The excellent electrocatalytic performance can be attributed to the needle-like structure with more active sites, accelerated charge transfer and evolved bubbles’ release. This work can provide new approach to the development of a bifunctional electrocatalyst for overall water splitting.
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Zhu, Jie, Mao Sun, Shujie Liu, Xianhu Liu, Kan Hu, and Lei Wang. "Study of active sites on Se-MnS/NiS heterojunctions as highly efficient bifunctional electrocatalysts for overall water splitting." Journal of Materials Chemistry A 7, no. 47 (2019): 26975–83. http://dx.doi.org/10.1039/c9ta10860b.

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20

Liu, Kai, Hongpu Huang, Yuxin Zhu, Shupeng Wang, Zixi Lyu, Xiao Han, Qin Kuang, and Shuifen Xie. "Edge-segregated ternary Pd–Pt–Ni spiral nanosheets as high-performance bifunctional oxygen redox electrocatalysts for rechargeable zinc–air batteries." Journal of Materials Chemistry A 10, no. 7 (2022): 3808–17. http://dx.doi.org/10.1039/d1ta10585j.

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Ultrathin Pd45Pt44Ni11 spiral nanosheets with abundant Pt/Ni-segregated edges exhibit excellent ORR and OER dual-electrocatalysis in alkaline, showcasing a workable air cathode electrocatalyst for high-efficiency and rechargeable Zn–air batteries.
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21

Venkatkarthick, R., D. J. Davidson, S. Ravichandran, S. Vengatesan, G. Sozhan, and S. Vasudevan. "Eco-friendly and facilely prepared silica modified amorphous titania (TiO2–SiO2) electrocatalyst for the O2 and H2 evolution reactions." Catalysis Science & Technology 5, no. 11 (2015): 5016–22. http://dx.doi.org/10.1039/c5cy00805k.

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A silica modified amorphous titania (TiO2–SiO2) electrocatalyst was prepared by a simple, cheap, and scalable preparation procedure. The catalyst is active in the oxygen and hydrogen evolution reactions, leading to a promising bifunctional electrocatalyst.
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22

Liu, Hengqi, Depeng Zhao, Meizhen Dai, Xiaofei Zhu, Fengyu Qu, Ahmad Umar, and Xiang Wu. "PEDOT decorated CoNi2S4 nanosheets electrode as bifunctional electrocatalyst for enhanced electrocatalysis." Chemical Engineering Journal 428 (January 2022): 131183. http://dx.doi.org/10.1016/j.cej.2021.131183.

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23

Mathialagan, Kowsalya, Saranya T, Ammu Surendran, Ditty Dixon, Nishanthi S.T., and Aiswarya Bhaskar. "(Digital Presentation) Development of Bifunctional Oxygen Electrocatalysts for Electrically Rechargeable Zinc-Air Batteries." ECS Meeting Abstracts MA2022-02, no. 4 (October 9, 2022): 403. http://dx.doi.org/10.1149/ma2022-024403mtgabs.

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Zinc-air battery is a promising battery system as it possesses high theoretical energy density and is cost-effective3. The theoretical energy density of a Zinc-air battery is 1086 Wh kg-1, which is five times greater than that of lithium-ion batteries2. Moreover, zinc metal is one of the most abundant metals in the earth’s crust and is inexpensive. Rechargeable metal-air batteries operate based on two fundamental electrochemical reactions as Oxygen Reduction Reaction (ORR) during discharge and Oxygen Evolution Reaction (OER) during recharge processes, respectively3. Electrocatalytic activity of the bifunctional electrocatalyst towards these two oxygen reactions will decide the performance of the battery1. Recent advancements in catalyst development are the fabrication of rechargeable air electrodes using a single active material that is capable of bifunctionally catalyzing ORR and OER3. The development of bifunctional catalysts with high activity is necessary for rechargeable metal-air batteries, such as zinc-air batteries3. In this work, a perovskite-type LaFeO3 material was synthesized using a citric acid-assisted sol-gel method and is investigated as bifunctional oxygen electrocatalyst for electrically rechargeable zinc-air batteries. Structural studies using X-ray diffraction revealed the formation of phase pure LaFeO3 in space group Pbnm. This catalyst displayed considerable bifunctional catalytic activity for both oxygen reduction (0.74 V vs. RHE) and oxygen evolution reactions (0.40 V vs. RHE at 10 mA cm-2) in 1 M KOH electrolyte. Electrically rechargeable zinc-air batteries assembled using LaFeO3 as the oxygen electrocatalyst deliver a specific capacity of 936.38 mAh g( Zn) -1 after the 1st discharge. Further details will be discussed in the poster. Financial support from Department of Science and Technology, Govt. of India under research grant number DST/TMD/MECSP/2K17/20 is gratefully acknowledged. References: [01] Y. Li, M. Gong, et. al., Nature communications, 4, (2013), 1-7 [02] P. Gu, M. Zheng, et. al., Journal of Material Chemistry, (2017), 1-17 [03] D. U. Lee, P. Xu, et. al., Journal of Material Chemistry, 4, (2016), 7107-7134
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24

Sasikala, N., K. Ramya, and K. S. Dhathathreyan. "Bifunctional electrocatalyst for oxygen/air electrodes." Energy Conversion and Management 77 (January 2014): 545–49. http://dx.doi.org/10.1016/j.enconman.2013.10.010.

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25

Li, Yang, Wei Zhou, Juncai Dong, Yun Luo, Pengfei An, Juan Liu, Xin Wu, Guilan Xu, Huabin Zhang, and Jian Zhang. "Interface engineered in situ anchoring of Co9S8 nanoparticles into a multiple doped carbon matrix: highly efficient zinc–air batteries." Nanoscale 10, no. 5 (2018): 2649–57. http://dx.doi.org/10.1039/c7nr07235j.

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Pan, Qingyan, Xinsheng Chen, Hui Liu, Weijin Gan, Naixiu Ding, and Yingjie Zhao. "Crystalline porphyrin-based graphdiyne for electrochemical hydrogen and oxygen evolution reactions." Materials Chemistry Frontiers 5, no. 12 (2021): 4596–603. http://dx.doi.org/10.1039/d1qm00285f.

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Singh, Vijay K., Umesh T. Nakate, Priyanuj Bhuyan, Jinyu Chen, Duy Thanh Tran, and Sungjune Park. "Mo/Co doped 1T-VS2 nanostructures as a superior bifunctional electrocatalyst for overall water splitting in alkaline media." Journal of Materials Chemistry A 10, no. 16 (2022): 9067–79. http://dx.doi.org/10.1039/d2ta00488g.

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Rajalakshmi, R., C. Viswanathan, and N. Ponpandian. "Sm3+ rare-earth doping in non-noble metal oxide –WO3 grown on carbon cloth fibre as a bifunctional electrocatalyst for high-performance water electrolysis." Sustainable Energy & Fuels 5, no. 22 (2021): 5851–65. http://dx.doi.org/10.1039/d1se01563j.

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Rajalakshmi, R., C. Viswanathan, and N. Ponpandian. "Sm3+ rare-earth doping in non-noble metal oxide –WO3 grown on carbon cloth fibre as a bifunctional electrocatalyst for high-performance water electrolysis." Sustainable Energy & Fuels 5, no. 22 (2021): 5851–65. http://dx.doi.org/10.1039/d1se01563j.

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Hu, Wenhui, Qing Wang, Shanshan Wu, and Yongmin Huang. "Facile one-pot synthesis of a nitrogen-doped mesoporous carbon architecture with cobalt oxides encapsulated in graphitic layers as a robust bicatalyst for oxygen reduction and evolution reactions." Journal of Materials Chemistry A 4, no. 43 (2016): 16920–27. http://dx.doi.org/10.1039/c6ta08103g.

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31

Xiao, Xin, Dekang Huang, Yanping Luo, Man Li, Mingkui Wang, and Yan Shen. "Ultrafine Pt nanoparticle decoration with CoP as highly active electrocatalyst for alcohol oxidation." RSC Advances 6, no. 102 (2016): 100437–42. http://dx.doi.org/10.1039/c6ra21938a.

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32

Rajagopal, Kayalvizhi, Murugavel Kathiresan, Arulmozhi Rajaram, Abirami Natarajan, and Kumaresan Natesan. "Development of robust noble-metal free lanthanum, neodymium doped Li1.05Ni0.5Mn1.5O4 as a bifunctional electrocatalyst for electrochemical water splitting." RSC Advances 13, no. 34 (2023): 23829–40. http://dx.doi.org/10.1039/d3ra04495e.

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33

Marsudi, Maradhana Agung, Yuanyuan Ma, Bagas Prakoso, Jayadi Jaya Hutani, Arie Wibowo, Yun Zong, Zhaolin Liu, and Afriyanti Sumboja. "Manganese Oxide Nanorods Decorated Table Sugar Derived Carbon as Efficient Bifunctional Catalyst in Rechargeable Zn-Air Batteries." Catalysts 10, no. 1 (January 1, 2020): 64. http://dx.doi.org/10.3390/catal10010064.

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Despite its commercial success as a primary battery, Zn-air battery is struggling to sustain a reasonable cycling performance mainly because of the lack of robust bifunctional electrocatalysts which smoothen the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) taking place on its air-cathode. Composites of carbon/manganese oxide have emerged as a potential solution with high catalytic performance; however, the use of non-renewable carbon sources with tedious and non-scalable synthetic methods notably compromised the merit of being low cost. In this work, high quantity of carbon is produced from renewable source of readily available table sugar by a facile room temperature dehydration process, on which manganese oxide nanorods are grown to yield an electrocatalyst of MnOx@AC-S with high oxygen bifunctional catalytic activities. A Zn-air battery with the MnOx@AC-S composite catalyst in its air-cathode delivers a peak power density of 116 mW cm−2 and relatively stable cycling performance over 215 discharge and charge cycles. With decent performance and high synthetic yield achieved for the MnOx@AC-S catalyst form a renewable source, this research sheds light on the advancement of low-cost yet efficient electrocatalyst for the industrialization of rechargeable Zn-air battery.
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Gao, Xiaolan, and Ge Li. "Ultrasmall Co9S8 nanocrystals on Carbon Nanoplates for Efficient Bifunctional Oxygen Electrocatalysis." ECS Meeting Abstracts MA2022-01, no. 49 (July 7, 2022): 2074. http://dx.doi.org/10.1149/ma2022-01492074mtgabs.

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Electrochemical energy storage and conversion technologies based on electrocatalysis have been attracting more and more attention addressing increasing concerns on fossil fuel crisis and environmental deterioration. Fuel cells, zinc-air batteries, and water electrolyzer are believed to be promising candidates due to the environmental friendliness and high efficiency. These systems are associated with key reactions including oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Due to slow kinetics of these reactions, efficient electrocatalysts, e.g., Pt for ORR and RuOx/IrOx for OER, are usually required to overcome the energy barrier in electrochemical reactions to increase the reaction rate. However, the most advanced electrocatalysts are still based on above-mentioned noble metals with high cost and scarcity, which inevitably retards the large-scale commercialization of these noble metal-based energy systems. It is of great significance to replace noble metal catalysts with earth-abundant, cost-effective, and highly efficient catalysts. Here, we reported the controlled synthesis of ultrafine Co9S8 nanocrystals embedded in N, S-codoped multilayer-assembled carbon nanoplates (Co9S8/NSCP) for highly efficient oxygen electrocatalysis. The bifunctional Co9S8/NSCP electrocatalyst displays a high half-wave potential for ORR, and a low overpotential for OER in 0.1M KOH at a current density of 10 mA cm -2, much better than those of single component counterparts (Co9S8 or carbon) and comparable to noble metal catalysts. The high performance of Co9S8/NSCP can be attributed to the rationally designed hierarchical architecture with nanosized Co9S8 nanocrystals, rich N, S-codopants, highly exposed surface area, and protective graphitic layers, providing abundant active sites with full utilization and stable carbon support towards fast catalytic kinetics and durability. This work will promote further research on the development of highly efficient and stable non-noble metal electrocatalysts for ORR and OER.
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Amaro-Gahete, Juan, José A. Salatti-Dorado, Almudena Benítez, Dolores Esquivel, Valentín García-Caballero, Miguel López-Haro, Juan J. Delgado, Manuel Cano, Juan J. Giner-Casares, and Francisco J. Romero-Salguero. "Surface Diels–Alder adducts on multilayer graphene for the generation of edge-enriched single-atom FeN4 sites for ORR and OER electrocatalysis." Sustainable Energy & Fuels 6, no. 6 (2022): 1603–15. http://dx.doi.org/10.1039/d2se00004k.

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36

Li, Junzhi, Guodong Wei, Yukun Zhu, Yunlong Xi, Xuexue Pan, Yuan Ji, Igor V. Zatovsky, and Wei Han. "Hierarchical NiCoP nanocone arrays supported on Ni foam as an efficient and stable bifunctional electrocatalyst for overall water splitting." Journal of Materials Chemistry A 5, no. 28 (2017): 14828–37. http://dx.doi.org/10.1039/c7ta03947f.

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37

Hu, Hao, Yuhua Xie, Farhad M. D. Kazim, Konggang Qu, Min Li, Zhikun Xu, and Zehui Yang. "Synergetic FeCo nanorods embedded in nitrogen-doped carbon nanotubes with abundant metal–NCNT heterointerfaces as efficient air electrocatalysts for rechargeable zinc–air batteries." Sustainable Energy & Fuels 4, no. 10 (2020): 5188–94. http://dx.doi.org/10.1039/d0se01023e.

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Guo, Jianing, Tingting Li, Qiuli Wang, Ningyuan Zhang, Yuanhui Cheng, and Zhonghua Xiang. "Superior oxygen electrocatalysts derived from predesigned covalent organic polymers for zinc–air flow batteries." Nanoscale 11, no. 1 (2019): 211–18. http://dx.doi.org/10.1039/c8nr08330d.

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The in situ synthesis of a bifunctional electrocatalyst based on a predesigned covalent organic polymer was reported. Remarkably, the obtained catalyst affords a remarkable bifunctional electrocatalytic performance with a small potential gap between E1/2 and Ej=10 of 0.650 V.
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39

Wang, Jing, Shuwei Zhang, Haihong Zhong, Nicolas Alonso-Vante, Dianqing Li, Pinggui Tang, and Yongjun Feng. "Nitrogen-Doped Ordered Mesoporous Carbons Supported Co3O4 Composite as a Bifunctional Oxygen Electrode Catalyst." Surfaces 2, no. 2 (March 29, 2019): 229–40. http://dx.doi.org/10.3390/surfaces2020018.

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It is increasingly useful to develop bifunctional catalysts for oxygen reduction and oxygen evolution reaction (ORR and OER) for fuel cells, metal-air rechargeable batteries, and unitized regenerative cells. Here, based on the excellent conductivity and stability of ordered mesoporous carbons, and the best ORR and OER activity of Co3O4, the composite Co3O4/N-HNMK-3 was designed and manufactured by means of a solvothermal method, using ordered N-doped mesoporous carbon (N-HNMK-3) as substrate, and then the bifunctional electrocatalytic performance corresponding to ORR, OER in alkaline media was carefully investigated. The results showed that Co3O4/N-HNMK-3 composite, a non-precious metal centered electrocatalyst, displayed excellent ORR performance (activity, selectivity, and stability) close to that of commercial 20 wt.% Pt/C and a promising OER activity near 20 wt.% RuO2/C. The outstanding bifunctional activities of Co3O4/N-HNMK-3 was assessed with the lowest △E value of 0.86 V (EOER,10 mA cm−2-EORR,−3 mA cm−2) with respect to the two commercial precious metal-based electrocatalysts.
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Niu, Weixing, Yani Guan, Yuhong Luo, Guihua Liu, and Jingde Li. "A macroporous titanium oxynitride-supported bifunctional oxygen electrocatalyst for zinc–air batteries." Catalysis Science & Technology 11, no. 24 (2021): 7922–31. http://dx.doi.org/10.1039/d1cy01328a.

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41

Ipadeola, Adewale K., and Kenneth I. Ozoemena. "Alkaline water-splitting reactions over Pd/Co-MOF-derived carbon obtained via microwave-assisted synthesis." RSC Advances 10, no. 29 (2020): 17359–68. http://dx.doi.org/10.1039/d0ra02307h.

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42

Sun, Chaoyang, Hui Wang, Shan Ji, Xuyun Wang, Vladimir Linkov, Xinlong Tian, Long Yao, Jiarui Zhao, and Rongfang Wang. "Layer-structured FeCo bihydroxide as an ultra-stable bifunctional electrocatalyst for water splitting at high current densities." Sustainable Energy & Fuels 5, no. 10 (2021): 2747–52. http://dx.doi.org/10.1039/d1se00380a.

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43

Wu, Aiping, Ying Gu, Bairui Yang, Han Wu, Haijing Yan, Yanqing Jiao, Dongxu Wang, Chungui Tian, and Honggang Fu. "Porous cobalt/tungsten nitride polyhedra as efficient bifunctional electrocatalysts for overall water splitting." Journal of Materials Chemistry A 8, no. 43 (2020): 22938–46. http://dx.doi.org/10.1039/d0ta09620b.

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44

Afaq, Muhammad, Muhammad Shahid, Iqbal Ahmad, Sheraz Yousaf, Amira Alazmi, M. H. H. Mahmoud, Islam H. El Azab, and Muhammad Farooq Warsi. "Large-scale sonochemical fabrication of a Co3O4–CoFe2O4@MWCNT bifunctional electrocatalyst for enhanced OER/HER performances." RSC Advances 13, no. 28 (2023): 19046–57. http://dx.doi.org/10.1039/d3ra03117a.

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45

Janani, Gnanaprakasam, Yujin Chae, Subramani Surendran, Yelyn Sim, Woosung Park, Jung Kyu Kim, and Uk Sim. "Rational Design of Spinel Oxide Nanocomposites with Tailored Electrochemical Oxygen Evolution and Reduction Reactions for ZincAir Batteries." Applied Sciences 10, no. 9 (May 1, 2020): 3165. http://dx.doi.org/10.3390/app10093165.

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The unique physical and chemical properties of spinels have made them highly suitable electrocatalysts in oxygen evolution reaction and oxygen reduction reaction (OER & ORR). Zinc–air batteries (ZABs), which are safer and more cost-effective power sources than commercial lithium-ion batteries, hinge on ORR and OER. The slow kinetics of the air electrode reduce its high theoretical energy density and specific capacity, which limits its practical applications. Thus, tuning the performance of the electrocatalyst and cathode architecture is vital for improving the performance of ZABs, which calls for exploring spinel, a material that delivers improved performance. However, the structure–activity relationship of spinel is still unclear because there is a lack of extensive information about it. This study was performed to address the promising potential of spinel as the bifunctional electrocatalyst in ZABs based on an in-depth understanding of spinel structure and active sites at the atomic level.
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46

Zahoor, Awan. "Effect of varying percentages of Co3O4 Nanoparticles on the Behavior of (ORR/OER) Bifunctional Co3O4/α-MnO2 Electrocatalyst." TECCIENCIA 18, no. 34 (December 12, 2023): 43–52. http://dx.doi.org/10.18180/tecciencia.2023.34.4.

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Among all type of batteries, Lithium Air Batteries (LAB) are considered to be the most effective due to their highest energy density of around 11900 Wh/kg but there are some major issues are being faced by LAB such as large overpotential, poor cycle life, low current density, and decreased energy efficiency. The solution to these issues is primarily dependent on the proper selection of an electrocatalyst. A new approach for using a bi-functional electrocatalyst produced excellent results. Here, Co3O4/α-MnO2 composite has been considered as a bifunctional catalyst because cobalt oxide performed well in the Oxygen Evolution Reaction (OER) process while manganese oxide performed well in the Oxygen Reduction Reaction (ORR) process. A simple two-step hydrothermal process is used in this work to synthesize Co3O4/α-MnO2. This work focuses on the behavior of the composite electrocatalyst when varying percentages of Cobalt oxide (5%, 10%, 15%, and 20%) are deposited on the alpha-Manganese Oxide nanorods. The primary characteristics of each sample with different percentages of Cobalt Oxide are examined, and the performance of each sample is compared to one another. Several testing techniques like Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV), X-Ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) are performed on the samples. The combination of cobalt oxide and manganese oxide showed a synergistic effect and work as a bifunctional electrocatalyst. As the percentage of Co3O4 deposited on the α-MnO2 nanorod increased, it behaves more like an OER electrocatalyst leading to a decrease in charging potential. This work will help in finding an optimum amount of Co3O4 that should be deposited on α-MnO2 nanorods to get an efficient (ORR/OER) bifunctional electrocatalyst.
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47

Zahoor, Awan, Ghadia Ahmed, Muhammad Amir, Faaz Butt Butt, and as Naqvi. "Effect of varying percentages of Co3O4 Nanoparticles on the Behavior of (ORR/OER) Bifunctional Co3O4/α-MnO2 Electrocatalyst." TECCIENCIA 18, no. 34 (February 2, 2023): 43–52. http://dx.doi.org/10.18180/tecciencia.2022.34.4.

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Among all type of batteries, Lithium Air Batteries (LAB) are considered to be the most effective due to their highest energy density of around 11900 Wh/kg but there are some major issues are being faced by LAB such as large overpotential, poor cycle life, low current density, and decreased energy efficiency. The solution to these issues is primarily dependent on the proper selection of an electrocatalyst. A new approach for using a bi-functional electrocatalyst produced excellent results. Here, Co3O4/α-MnO2 composite has been considered as a bifunctional catalyst because cobalt oxide performed well in the Oxygen Evolution Reaction (OER) process while manganese oxide performed well in the Oxygen Reduction Reaction (ORR) process. A simple two-step hydrothermal process is used in this work to synthesize Co3O4/α-MnO2. This work focuses on the behavior of the composite electrocatalyst when varying percentages of Cobalt oxide (5%, 10%, 15%, and 20%) are deposited on the alpha-Manganese Oxide nanorods. The primary characteristics of each sample with different percentages of Cobalt Oxide are examined, and the performance of each sample is compared to one another. Several testing techniques like Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV), X-Ray Diffraction (XRD), and Scanning Electron Microscopy (SEM) are performed on the samples. The combination of cobalt oxide and manganese oxide showed a synergistic effect and work as a bifunctional electrocatalyst. As the percentage of Co3O4 deposited on the α-MnO2 nanorod increased, it behaves more like an OER electrocatalyst leading to a decrease in charging potential. This work will help in finding an optimum amount of Co3O4 that should be deposited on α-MnO2 nanorods to get an efficient (ORR/OER) bifunctional electrocatalyst.
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48

Liu, Huanhuan, Zhenhua Yan, Xiang Chen, Jinhan Li, Le Zhang, Fangming Liu, Guilan Fan, and Fangyi Cheng. "Electrodeposition of Pt-Decorated Ni(OH)2/CeO2 Hybrid as Superior Bifunctional Electrocatalyst for Water Splitting." Research 2020 (December 15, 2020): 1–11. http://dx.doi.org/10.34133/2020/9068270.

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The facile synthesis of highly active and stable bifunctional electrocatalysts to catalyze water splitting is attractive but challenging. Herein, we report the electrodeposition of Pt-decorated Ni(OH)2/CeO2 (PNC) hybrid as an efficient and robust bifunctional electrocatalyst. The graphite-supported PNC catalyst delivers superior hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities over the benchmark Pt/C and RuO2, respectively. For overall water electrolysis, the PNC hybrid only requires a cell voltage of 1.45 V at 10 mA cm−2 and sustains over 85 h at 1000 mA cm−2. The remarkable HER/OER performances are attributed to the superhydrophilicity and multiple effects of PNC, in which Ni(OH)2 and CeO2 accelerate HER on Pt due to promoted water dissociation and strong electronic interaction, while the electron-pulling Ce cations facilitate the generation of high-valence Ni OER-active species. These results suggest the promising application of PNC for H2 production from water electrolysis.
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Wu, Zexing, Dazong Nie, Min Song, Tiantian Jiao, Gengtao Fu, and Xien Liu. "Facile synthesis of Co–Fe–B–P nanochains as an efficient bifunctional electrocatalyst for overall water-splitting." Nanoscale 11, no. 15 (2019): 7506–12. http://dx.doi.org/10.1039/c9nr01794a.

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50

Wang, Wei, Haitao Wang, Yang Yu, Zexing Wu, Muhammad Asif, and Hongfang Liu. "Metallic cobalt modified MnO–C nanocrystalline composites as an efficient bifunctional oxygen electrocatalyst." Catalysis Science & Technology 8, no. 2 (2018): 480–85. http://dx.doi.org/10.1039/c7cy01957b.

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