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Journal articles on the topic 'ZnCo2O4'

Author: Grafiati
Published: 6 September 2023

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1

Wang, Jinjin, Tianfeng Ye, Yanqun Shao, Zhiyuan Lu, Yuting Lin, Huixuan Wu, Guoyong Li, Kongfa Chen, and Dian Tang. "Flower-Like Nanostructured ZnCo2O4/RuO2 Electrode Materials for High Performance Asymmetric Supercapacitors." Journal of The Electrochemical Society 168, no. 12 (December 1, 2021): 120553. http://dx.doi.org/10.1149/1945-7111/ac42a4.

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RuO2 is well known to be an active and expensive metal oxide. In the paper, ZnCo2O4/RuO2 nanocomposites were synthesized by simple hydrothermal, impregnation and calcination methods. Due to the multifunctional bridge structure, RuO2 could not only effectively inhibit the volume change of ZnCo2O4 in long-term work but also provide more redox active sites. The forbidden bandwidth was reduced and the conductivity was improved after doping RuO2. Compared with ZnCo2O4, the density of state of ZnCo2O4/RuO2 tended to a higher energy level. ZnCo2O4/3 wt% RuO2 electrode exhibited an excellent specific capacitance (1346.56 F g−1) and cyclic stability in 6 M KOH aqueous solution. For the first time, the electrochemical performance of ZnCo2O4/RuO2//IrO2-ZnO ASC has been evaluated in two-electrode configurations. The supercapacitor exhibited an excellent energy density of 40.89 W h kg−1 at the power density of 740 W kg−1 and a high capacitance retention of 87.5% even after 7000 cycles at a scanning rate of 100 mV s−1. The ZnCo2O4/RuO2 was a promising electrode material for supercapacitors.
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2

Kim, Hyun Jung, In Chang Song, Jae Ho Sim, Hyo Jin Kim, Do Jin Kim, Young Eon Ihm, and Woong Kil Choo. "Effect of Growth Condition on the Electrical and Magnetic Properties of Sputtered ZnCo2O4 Films." Materials Science Forum 449-452 (March 2004): 509–12. http://dx.doi.org/10.4028/www.scientific.net/msf.449-452.509.

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We report on the effect of the oxygen partial pressure ratio in the sputtering gas mixture on the electrical and magnetic properties of cubic spinel ZnCo2O4 thin films grown by reactive magnetron sputtering. The conduction type and carrier concentration in ZnCo2O4 films were found to be dependent on the oxygen partial pressure ratio. The maximum electron and hole concentration at 300 K were estimated to be as high as 1.37 × 1020 cm-3 and 2.81 × 1020 cm-3, respectively. While an antiferromagnetic coupling was found for n-type ZnCo2O4, a ferromagnetic interaction was observable in p-type ZnCo2O4, indicating hole-induced ferromagnetic transition in spinel ZnCo2O4.
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3

Rajesh, John, and Kwang-Soon Ahn. "Facile Hydrothermal Synthesis and Supercapacitor Performance of Mesoporous Necklace-Type ZnCo2O4 Nanowires." Catalysts 11, no. 12 (December 13, 2021): 1516. http://dx.doi.org/10.3390/catal11121516.

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In this work, mesoporous ZnCo2O4 electrode material with necklace-type nanowires was synthesized by a simple hydrothermal method using water/ethylene glycol mixed solvent and subsequent calcination treatment. The ZnCo2O4 nanowires were assembled by several tiny building blocks of nanoparticles which led to the growth of necklace-type nanowires. The as-synthesized ZnCo2O4 nanowires had porous structures with a high surface area of 25.33 m2 g−1 and with an average mesopore of 23.13 nm. Due to the higher surface area and mesopores, the as-prepared necklace-type ZnCo2O4 nanowires delivered a high specific capacity of 439.6 C g−1 (1099 F g−1) at a current density of 1 A g−1, decent rate performance (47.31% retention at 20 A g−1), and good cyclic stability (84.82 % capacity retention after 5000 cycles). Moreover, a hybrid supercapacitor was fabricated with ZnCo2O4 nanowires as a positive electrode and activated carbon (AC) as a negative electrode (ZnCo2O4 nanowires//AC), which delivered an energy density of 41.87 Wh kg−1 at a power density of 800 W kg−1. The high electrochemical performance and excellent stability of the necklace-type ZnCo2O4 nanowires relate to their unique architecture, high surface area, mesoporous nature, and the synergistic effect between Zn and Co metals.
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4

Narasimharao, Katabathini, Mohamed Mokhtar M. Mostafa, Zahra M. Al-Amshany, and Wejdan Bajafar. "Mechanochemical Synthesized CaO/ZnCo2O4 Nanocomposites for Biodiesel Production." Catalysts 13, no. 2 (February 13, 2023): 398. http://dx.doi.org/10.3390/catal13020398.

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Biodiesel has been recognized as an environmentally friendly, renewable alternative to fossil fuels. In this work, CaO/ZnCo2O4 nanocomposites were successfully synthesized via simple mechanochemical reaction between ZnCo2O4 and CaO powders by varying the CaO loading from 5 to 20 wt.%. The synthesized materials were found to be highly efficient heterogeneous catalysts for transesterification of tributyrin with methanol to produce biodiesel. The nanocomposite, which contained 20 wt.% CaO and 80 wt.% ZnCo2O4 (CaO/ZnCo2O4-20), exhibited superior and stable transesterification activity (98% conversion) under optimized reaction conditions (1:12 TBT to methanol molar ratio, 5 wt.% catalyst and 180 min. reaction time). The experimental results revealed that the reaction mechanism on the CaO/ZnCo2O4 composite followed pseudo first-order kinetics. The physicochemical characteristics of the synthesized nanocomposites were measured using X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), Fourier-transformed infrared spectroscopy (FTIR), X-ray photoelectron spectrometer (XPS), N2-physisorption, and CO2- temperature-programmed desorption (CO2-TPD) techniques. The results indicated the existence of coalescence between the CaO and ZnCo2O4 particles, Additionally, the CaO/ZnCo2O4-20 catalyst was found to possess the greater number of highly basic sites and high porosity, which are the key factors affecting catalytic performance in transesterification reactions.
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5

Lin, En-Syuan, Feng-Sheng Chao, Chen-Jui Liang, Chi-Jung Chang, Alex Fang, Chung-Kwei Lin, Yu-Cheng Chang, Chien-Yie Tsay, Jerry J. Wu, and Chin-Yi Chen. "Hydrothermal Synthesis of Co3O4/ZnCo2O4 Core-Shell Nanostructures for High-Performance Supercapacitors." Journal of The Electrochemical Society 168, no. 12 (December 1, 2021): 123502. http://dx.doi.org/10.1149/1945-7111/ac3a27.

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Supercapacitive properties of Co/ZnCo oxide composite with a core–shell nanostructure (Co3O4/ZnCo2O4) prepared directly onto a nickel foam substrate by a two-step hydrothermal method were investigated. The synthesized core–shell structure consisted of some ∼40–100 nm in thick flaky ZnCo2O4 deposits coated onto the surface of Co3O4 nanorods measuring ∼150 nm in diameter. The specific capacitance value of the Co3O4/ZnCo2O4 core–shell nanostructure synthesized by hydrothermal at 130 °C for a ZnCo2O4 deposition time of 2 h can attain 1804 F g−1 at a scan rate of 5 mV s−1. Furthermore, the core–shell structured electrode still exhibited a relatively good capacitance retention of more than 93% after 3000 CV cycles due to the superior structural support of Co3O4 scaffolds. The Co3O4/ZnCo2O4 core–shell structure exhibits excellent electrochemical performances and, as such, is one of the more promising active materials in pseudocapacitor applications.
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Yang, Qianqian, Yifei Xu, Xiaodong Xue, Ning Zhang, Rui Feng, Meng Sun, Tao Yan, and Liangguo Yan. "Constructing an efficient ZnCo2O4/ZnIn2S4 composite with boosted visible-light photocatalytic hydrogen evolution." Materials Express 12, no. 3 (March 1, 2022): 426–34. http://dx.doi.org/10.1166/mex.2022.2059.

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Herein, a novel ZnCo2O4/ZnIn2S4 composite was prepared through a novel one-pot refluxing wet chemistry process successfully. The phase structure, micro morphology and optical properties of photocatalyst were analyzed through XRD, SEM, XPS and UV-vis spectroscopy. The photocatalysis of the prepared specimens were assessed by the photocatalytic hydrogen evolution with visible-light (λ > 420 nm). Consequently, the ZnCo2O4/ZnIn2S4 photocatalyst displayed better photocatalysis than the original constituents for hydrogen evolution. Moreover, the corresponding maximized hydrogen production rate of ZnCo2O4/ZnIn2S4 composite loaded with 15% ZnCo2O4 was 3713.4 μmol · h−1 · g−1, which registered approximately 10.2 folds higher than pristine ZnIn2S4. Moreover, the ZnCo2O4/ZnIn2S4 composite manifested superior stability during the photocatalytic reactions. In addition, the underlying mechanism for the outstanding performance of hydrogen production was revealed as well. This research offers inspiration for the rational creation of high-efficiency photocatalytic agents for hydrogen evolution.
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Aruchamy, Kanakaraj, Athinarayanan Balasankar, Subramaniyan Ramasundaram, and Tae Hwan Oh. "Recent Design and Synthesis Strategies for High-Performance Supercapacitors Utilizing ZnCo2O4-Based Electrode Materials." Energies 16, no. 15 (July 25, 2023): 5604. http://dx.doi.org/10.3390/en16155604.

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ZnCo2O4 has emerged as a promising electrode material for supercapacitor applications due to its unique properties and potential for high-performance energy storage. As a transition metal oxide, ZnCo2O4 offers eco-friendly characteristics and favorable diffusion properties, making it an attractive candidate for sustainable energy storage systems. However, the poor conductivity and low surface area of ZnCo2O4 have posed challenges for its optimal utilization in supercapacitors. Various innovative approaches have been explored to overcome these limitations, including the development of ZnCo2O4 with different morphologies such as core-shell and porous structures. This review work aims to provide a comprehensive analysis of diverse synthesis methods employed in recent studies, including hydrothermal growth, solvothermal synthesis, wet chemical methods, and miscellaneous synthesis techniques, each offering unique advantages and influencing the properties of the synthesized materials. The synthesis conditions, such as precursor concentrations, temperature, annealing time, and the incorporation of dopants or additional materials, were found to play a crucial role in determining the electrochemical performance of ZnCo2O4-based supercapacitor electrodes. Core-shell heterostructures based on ZnCo2O4 exhibited versatility and tunability, with the choice of shell material significantly impacting the electrochemical performance. The incorporation of different materials in composite electrodes, as well as doping strategies, proved effective in enhancing specific capacitance, stability, surface area, and charge transfer characteristics. Controlled synthesis of ZnCo2O4 with diverse morphologies and porosity was crucial in improving mechanical strength, surface area, and ion diffusion capabilities. The findings provide valuable insights for the design and engineering of high-performance supercapacitor electrodes based on ZnCo2O4, and suggest exciting avenues for further exploration, including advanced characterization techniques, novel doping strategies, scale-up of synthesis methods, and integration into practical supercapacitor devices. Continued research and development in this field will contribute to the advancement of energy storage technologies and the realization of efficient and sustainable energy storage systems.
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8

Zhao, Wenjia, Zhaoping Shi, Yongbing Qi, and Jipeng Cheng. "The Carbon-Coated ZnCo2O4 Nanowire Arrays Pyrolyzed from PVA for Enhancing Lithium Storage Capacity." Processes 8, no. 11 (November 20, 2020): 1501. http://dx.doi.org/10.3390/pr8111501.

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In this paper, ZnCo2O4 nanowire arrays with a uniform carbon coating were introduced when polyvinyl alcohol (PVA) served as the carbon source. The coating process was completed by a facile bath method in PVA aqueous solution and subsequent pyrolyzation. The PVA-derived carbon-coated ZnCo2O4 nanowire array composites can be used directly as the binder-free and self-supported anode materials for lithium-ion batteries. In the carbon-coated ZnCo2O4 composites, the carbon layer carbonized from PVA can accelerate the electron transfer and accommodate the volume swing during the cycling process. The lithium storage properties of the carbon-coated ZnCo2O4 composites are investigated. It is believed that the novel carbon-coating method is universal and can be applied to other nanoarray materials.
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9

Chang, Xin, Xiangyang Xu, Zhifeng Gao, Yingrui Tao, Yixuan Yin, Guangyu He, and Haiqun Chen. "Activation of persulfate by heterogeneous catalyst ZnCo2O4–RGO for efficient degradation of bisphenol A." Canadian Journal of Chemistry 98, no. 12 (December 2020): 771–78. http://dx.doi.org/10.1139/cjc-2020-0192.

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A nanocomposite, reduced graphene oxide (RGO) modified ZnCo2O4 (ZnCo2O4–RGO) was synthesized via one-step solvothermal method for activating persulfate (PS) to degrade bisphenol A (BPA). The morphology and structure of the nanocomposite were identified by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. RGO provides nucleation sites for ZnCo2O4 to grow and inhibits the agglomeration of the nanoparticles. The influence of different reaction conditions on the oxidation of BPA catalyzed by ZnCo2O4–RGO was investigated, including the content of RGO, the dosage of catalyst, the concentration of humic acid (HA), anions in the environment, the reaction temperature, and pH. BPA can be totally degraded within 20 min under optimized reaction conditions. The presence of HA, Cl−, and NO3− only has a slight effect on the oxidation of BPA, whereas the presence of either H2PO4− or HCO3− can greatly inhibit the reaction. ZnCo2O4–RGO shows good cycling stability and practical application potential. A reaction mechanism of the degradation of BPA was also explored.
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10

Li, Wang, Yulin Guo, Yan Liu, Wen Yang, Jifan Hu, and Jiangwei Ma. "A controllable surface etching strategy for MOF-derived porous ZnCo2O4@ZnO/Co3O4 oxides and their sensing properties." RSC Advances 13, no. 36 (2023): 24936–43. http://dx.doi.org/10.1039/d3ra05135h.

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A surface etching strategy was proposed for the controllable synthesis of MOF-derived ZnCo2O4@ZnO/Co3O4 oxides, and the ZnCo2O4@ZnO/Co3O4-6 h sensor device exhibits the highest response and excellent selectivity to 100 ppm methanal at 200 °C.
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11

Prasad, Kumcham, Gutturu Rajasekhara Reddy, Megala Rajesh, P. Reddi Babu, Gnanendra Shanmugam, N. John Sushma, M. Siva Pratap Reddy, Borelli Deva Prasad Raju, and Koduru Mallikarjuna. "Electrochemical Performance of 2D-Hierarchical Sheet-Like ZnCo2O4 Microstructures for Supercapacitor Applications." Crystals 10, no. 7 (July 1, 2020): 566. http://dx.doi.org/10.3390/cryst10070566.

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With the rapid improvement of the global economy, the role of energy has become even more vital in the 21st century. In this regard, energy storage/conversion devices have become a major, worldwide research focus. In response to this, we have prepared two-dimensional (2D)-hierarchical sheet-like ZnCo2O4 microstructures for supercapacitor applications using a simple hydrothermal method. The 2D-hierarchical sheet-like morphologies with large surface area and smaller thickness enhanced the contact area of active material with the electrolyte, which increased the utilization rate. We investigated the electrochemical performance of sheet-like ZnCo2O4 microstructures while using Cyclic voltammetry (CV), Galvanostatic charge-discharge (GCD), and Electrochemical impedance spectroscopy (EIS) analysis. The electrochemical results demonstrated that the ZnCo2O4 electrode possesses 16.13 mF cm−2 of areal capacitance at 10 µA cm−2 of current density and outstanding cycling performance (170% of capacitance is retained after 1000 cycles at 500 µA cm−2). The high areal capacitance and outstanding cycling performance due to the unique sheet-like morphology of the ZnCo2O4 electrode makes it an excellent candidate for supercapacitor applications.
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12

Fu, Yu, Shuhong Ba, Lu Feng, Ping Xia, Wendong Sun, Bo Zhang, Yuanyu Zhao, Jianing Tian, and Fei Wang. "Study on the catalytic performance of a new double-shell composite energetic material." Journal of Physics: Conference Series 2566, no. 1 (August 1, 2023): 012001. http://dx.doi.org/10.1088/1742-6596/2566/1/012001.

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Abstract To improve the pyrolysis of ammonium perchlorate (AP), the effects of P-N junction metal oxides with different coating sequences on thermal decomposition were compared. AP / ZnO / ZnCo2O4 double-shell composite energetic materials and AP / ZnCo2O4 / ZnO double-shell composite energetic materials were manufactured by the liquid phase deposition method. XRD, FT-IR, and TEM characterize the structure of samples. The self-catalytic properties of double-shell composite energetic materials were investigated by differential thermal analysis (DTA). XRD, FT-IR, and TEM results show the formation of a P-N junction. The double-shell composite energetic material was successfully prepared and had a good coating effect. DTA results show the Pyrolytic peak of AP / ZnO / ZnCo2O4 double-shell composite energetic materials has been drowned to 262.85 °C. The decomposition peak of AP / ZnCo2O4 / ZnO double-shell composite energetic material is 272.31 °C, and the difference between the two is obvious. The coating of N-type metal semiconductor material can greatly improve the autocatalytic performance of the material, giving a new idea for designing AP catalysts.
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13

Dong, J. Y., N. Zhang, S. Y. Lin, T. T. Chen, M. Y. Zhang, L. L. Wu, H. Gao, and X. T. Zhang. "Effect of Morphology of ZnCo2O4 Nanostructures on Electrochemical Performance." Nano 11, no. 08 (August 2016): 1650089. http://dx.doi.org/10.1142/s1793292016500892.

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The ZnCo2O4 nanorods and nanosheets were grown on nickel foam by a facile and effective hydrothermal method, respectively. The effect of the morphologies of the nanostructures on electrochemical performance was investigated. Importantly, ZnCo2O4 nanorod electrodes with a high specific surface area exhibited a higher specific capacitance of 2457.4 F g[Formula: see text] at 2 A g[Formula: see text] and remarkable cycling stability with capacitance retention of 97.7% after 1000 cycles, which are superior to those of ZnCo2O4 nanosheet electrodes. Such a result is well explained. The investigation on the electrochemical properties of these two nanostructures as electrodes confirmed that the morphology of active materials has an important impact on electrochemical properties.
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Tan, Vu T., La The Vinh, Tran Ngoc Khiem, and Huynh Dang Chinh. "Facile Template In-Situ Fabrication of ZnCo2O4 Nanoparticles with Highly Photocatalytic Activities under Visible-Light Irradiation." Bulletin of Chemical Reaction Engineering & Catalysis 14, no. 2 (August 1, 2019): 404. http://dx.doi.org/10.9767/bcrec.14.2.3613.404-412.

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High specific surface area ZnCo2O4 nanoparticles were prepared via a sacrificial template accelerated hydrolysis by using nanoparticles of ZnO with highly polar properties as a template. The obtained ZnCo2O4 nanoparticles were characterized by the method of scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) surface area measurements, Transmission electron microscopy (TEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The obtained nanoparticles were performed as a photocatalyst for the degradation of methylene blue in aqueous solution under visible irradiation. The photocatalytic degradation rate of methylene blue onto the synthesized ZnCo2O4 was higher than that of commercial ZnO and synthesized ZnO template. Copyright © 2019 BCREC Group. All rights reserved.
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15

Murai, Ryota, Minoru Maeda, Kouichi Takase, Yoshiki Takano, and Tadataka Watanabe. "Magnetic Properties of Spinel Cobaltite A Co2O4 (A=Zn and Li)." Solid State Phenomena 257 (October 2016): 115–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.257.115.

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We synthesized polycrystals of cobaltite spinels LiCo2O4, ZnCo2O4, and their mixed crystal (Li1-xZnx)Co2O4, and performed the magnetic susceptibility and specific heat measurements. LiCo2O4 with the Weiss temperature ΘW ~ -114 K exhibits an antiferromagnetic transition at TN ~ 30 K. On the other hand, ZnCo2O4 with the Weiss temperature ΘW ~ -90 K exhibits the absence of magnetic phase transition down to low temperature (2 K), indicating the presence of strong frustration. Taking into account the absence of magnetic phase transition in the orbital-degenerate ZnCo2O4, it is suggested that the antiferromagnetic transition in the charge-orbital-degenerate LiCo2O4 is driven by the charge degree of freedom. Furthermore, the magnetic properties of (Li1-xZnx)Co2O4 suggest that the antiferromagnetic transition in LiCo2O4 is sensitively suppressed by diluting the charge degeneracy.
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16

Abbas, Qasim, Sajid Hussain Siyal, Abdul Mateen, Majed A. Bajaber, Awais Ahmad, Muhammad Sufyan Javed, Patrick Martin, Nicolas Joly, and Patrizia Bocchetta. "Flower-like Highly Open-Structured Binder-Free Zn-Co-Oxide Nanosheet for High-Performance Supercapacitor Electrodes." Molecules 27, no. 15 (July 29, 2022): 4850. http://dx.doi.org/10.3390/molecules27154850.

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Scientific research is being compelled to develop highly efficient and cost-effective energy-storing devices such as supercapacitors (SCs). The practical use of SC devices is hindered by their low energy density and poor rate capability due to the binding agents in fabricating electrodes. Herein, we proposed flower-like highly open-structured binder-free ZnCo2O4 micro-flowers composed of nanosheets supported in nickel foam (ZnCoO@NF) with improved rate capability up to 91.8% when current varied from 2 to 20 A·g−1. The ZnCoO@NF electrode exhibited a superior specific capacitance of 1132 F·g−1 at 2 A·g−1 and revealed 99% cycling stability after 7000 cycles at a high current density of 20 A·g−1. The improved performance of the ZnCoO@NF electrode is attributed to the highly stable structure of the micro/nano-multiscale architecture, which provides both the high conduction of electrons and fast ionic transportation paths simultaneously.
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Li, Yucai, Yan Zhao, Dong Zhang, Shiwei Song, Jian Wang, Xiandong Zhu, and Tianwen Li. "Improvement of Electrochemical Performance of ZnCo2O4@Co9S8 Nanosheets for Supercapacitors." Journal of Nanoelectronics and Optoelectronics 16, no. 7 (July 1, 2021): 1058–62. http://dx.doi.org/10.1166/jno.2021.3045.

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ZnCo2O4@Co9S8 nanostructures were grown on the surface of Ni foam by facile hydrothermal method and subsequent thermal treatment process, thus increasing the active site on the surface of the material. After vulcanization treatment, the performance of the composite material has been significantly improved the product has a higher specific capacitance of 1018.2 F g−1 at 4 A g−1. This work demonstrates that ZnCo2O4@Co9S8 nanostructures are highly desirable for application as advanced electrochemical electrode materials.
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Sandhiya, M., G. Kaviarasan, S. Santhoshkumar, and M. Sathish. "Tailoring the capacitive performance of ZnCo2O4 by doping of Ni2+ and fabrication of asymmetric supercapacitor." New Journal of Chemistry 45, no. 46 (2021): 21919–27. http://dx.doi.org/10.1039/d1nj03986e.

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19

PIMENTEL, P. M., A. M. G. PEDROSA, H. K. S. SOUZA, C. N. S. JÚNIOR, R. C. A. PINTO, and D. M. A. MELO. "PECHINI SYNTHESIS AND CHARACTERIZATION OF Eu3+ DOPED ZnCo2O4 SPINELS." Periódico Tchê Química 03, no. 2 (January 20, 2005): 24–29. http://dx.doi.org/10.52571/ptq.v2.n03.2005.janeiro/4_pgs_24_29.pdf.

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Spinel oxides with the composition ZnCo2O4 and ZnCo2O4:Eu3+ have been synthesized by the Pechini method and characterized by X-ray diffraction, infrared spectroscopy, thermal analysis and scanning electron microscopy. IR spectroscopy revealed the presence of n1 and n2 bands, typical of spinel structures. The formation of monophase cubic spinel structure was confirmed by X-ray diffraction patterns. Extra lines corresponding to other phase has been observed in the powders calcined at 900 ºC. The results showed the extremely lower synthesis temperature than those presents in conventional methods.
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Wang, Hao, Yu Zhang, Enyan Guo, Chengge Hu, Qifang Lu, Mingzhi Wei, Jingyun Ma, and Conghui Si. "Vertically aligned ZnCo2O4 nanoplates on Ti3C2 for high-efficiency hybrid supercapacitors." New Journal of Chemistry 46, no. 9 (2022): 4385–94. http://dx.doi.org/10.1039/d1nj05585b.

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Sun, Ling Na, Qiang Wang, and Chang Wen Hu. "Preparation of ZnCo2O4 Micro-Materials via a Solvothermal Route." Advanced Materials Research 531 (June 2012): 120–23. http://dx.doi.org/10.4028/www.scientific.net/amr.531.120.

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Different ZnCo2O4 micro-materials had been synthesized using surfactant (CTAB) in the solution of mixed solvents. Using CTAB as morphology-controlling agent, different morphologies of ZnCo2O4 are obtained successfully. The concentration of the reactants and the dosage of CTAB had significant effects on the morphology of the products. The morphologies of micro-cubes, micro-plates, and micro-particles were efficiently obtained, respectively, with careful control of the fundamental experimental parameters including the concentration of the reactants and the dosage of CTAB. X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize these products.
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Channab, Badr-Eddine, Mohamed El Ouardi, Salah Eddine Marrane, Omar Ait Layachi, Ayoub El Idrissi, Salaheddine Farsad, Driss Mazkad, Amal BaQais, Mohammed Lasri, and Hassan Ait Ahsaine. "Alginate@ZnCO2O4 for efficient peroxymonosulfate activation towards effective rhodamine B degradation: optimization using response surface methodology." RSC Advances 13, no. 29 (2023): 20150–63. http://dx.doi.org/10.1039/d3ra02865h.

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Mai Tho, Nguyen Thi, Nguyen Van Cuong, Viet Ha Luu Thi, Nguyen Quoc Thang, and Phuc Huu Dang. "A novel n–p heterojunction Bi2S3/ZnCo2O4 photocatalyst for boosting visible-light-driven photocatalytic performance toward indigo carmine." RSC Advances 13, no. 24 (2023): 16248–59. http://dx.doi.org/10.1039/d3ra02803h.

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Benhebal, Hadj, Cédric Wolfs, Samir Kadi, Rémi G. Tilkin, Boualem Allouche, Radhwane Belabid, Valérie Collard, et al. "Visible Light Sensitive SnO2/ZnCo2O4 Material for the Photocatalytic Removal of Organic Pollutants in Water." Inorganics 7, no. 6 (June 21, 2019): 77. http://dx.doi.org/10.3390/inorganics7060077.

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In this study, pure ZnCo2O4 and SnO2/ZnCo2O4 mix photocatalysts have been synthesized by the sol-gel process with three different SnO2 loading percentages (10, 20, and 30 wt %). Their photocatalytic activities were assessed on the degradation of organic pollutants in water under visible illumination. The structural, morphological, and optical properties were analyzed by X-ray diffraction (XRD), scanning electron microscopy, energy-dispersive X-ray (EDX), Fourier transform infrared (FTIR), nitrogen adsorption-desorption isotherms, X-ray photoelectron spectroscopy (XPS), and UV–Visible diffuse reflectance measurements. The results have shown that the materials are composed of a crystalline ZnCo2O4 matrix with a decrease in crystallite size with the amount of SnO2. Weakly crystalline SnO2 is also observed for loaded samples. The specific surface area is modified with the loading ratio. The evaluation of the photoactivity of the samples under visible light for the degradation of p-nitrophenol has highlighted that all materials are highly photoactive under visible light thanks to heterojunction between the two oxides. An application test has been conducted on a dye, congo red, showing the same tendencies. An optimal amount of SnO2 loading is observed for the sample containing 20 wt % of SnO2. A comparison with commercial Evonik P25 showed that the materials developed in this work have five to six times better efficiency under visible light, leading to a promising photocatalyst material.
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Wang, Xin, Ping Wu, Zhenlong Zhao, Li Sun, Qingfang Deng, Zhuoxun Yin, and Xiaoshuang Chen. "Construction of flower-like ZnCo2S4/ZnCo2O4 arrays on Ni foam for high-performance asymmetric supercapacitors." Journal of Materials Science: Materials in Electronics 31, no. 6 (February 13, 2020): 4895–904. http://dx.doi.org/10.1007/s10854-020-03053-y.

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Zeng, Tao, Sijia Jin, Zhiquan Jin, Shuqi Li, Rui Zou, Xiaole Zhang, Shuang Song, and Min Liu. "Ultrafine ZnCo2O4 QD-incorporated carbon nitride mediated peroxymonosulfate activation for norfloxacin oxidation: performance, mechanisms and pathways." RSC Advances 13, no. 20 (2023): 14048–59. http://dx.doi.org/10.1039/d3ra02364h.

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27

Mallem, Siva Pratap Reddy, Mallikarjuna Koduru, Kuppam Chandrasekhar, S. V. Prabhakar Vattikuti, Ravi Manne, V. Rajagopal Reddy, and Jung-Hee Lee. "Potato Chip-Like 0D Interconnected ZnCo2O4 Nanoparticles for High-Performance Supercapacitors." Crystals 11, no. 5 (April 22, 2021): 469. http://dx.doi.org/10.3390/cryst11050469.

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Zinc cobaltite (ZnCo2O4) is an emerging electrode material for supercapacitors due to its rich redox reactions involving multiple oxidation states and different ions. In the present work, potato chip-like 0D interconnected ZnCo2O4 nanoparticles (PIZCON) were prepared using a solvothermal approach. The prepared material was characterized using various analytical methods, including X-ray powder diffraction and scanning electron microscopy. The possible formation mechanism of PIZCON was proposed. The PIZCON electrode material was systematically characterized for supercapacitor application. The areal capacitance of PIZCON was 14.52 mF cm−2 at 10 µA cm−2 of current density, and retention of initial capacitance was 95% at 250 µA cm−2 following 3000 continuous charge/discharge cycles. The attained measures of electrochemical performance indicate that PIZCON is an excellent supercapacitor electrode material.
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Yuan, Lei, Yu Liu, Na Xin, and Ren He. "Hierarchical structure ZnCo2O4/ZnCo2O4/CoO@rGO/GO as cathode material to construct high energy density supercapacitor." Journal of Energy Storage 52 (August 2022): 104727. http://dx.doi.org/10.1016/j.est.2022.104727.

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29

Wang, Ling, Di Li, Jian Zhang, Chunjun Song, Hongxing Xin, and Xiaoying Qin. "Porous flower-like ZnCo2O4 and ZnCo2O4@C composite: a facile controllable synthesis and enhanced electrochemical performance." Ionics 26, no. 9 (May 21, 2020): 4479–87. http://dx.doi.org/10.1007/s11581-020-03609-2.

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Tong, Yongli, Xinyu Cheng, Dongli Qi, Baoqian Chi, and Weiqiang Zhang. "Hybrid ZnCo2O4@Co3S4 Nanowires for High-Performance Asymmetric Supercapacitors." Journal of Nanoelectronics and Optoelectronics 15, no. 12 (December 1, 2020): 1552–58. http://dx.doi.org/10.1166/jno.2020.2894.

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We successfully fabricate hierarchical ZnCo2O4@Co3S4 nanowires directly supported on nickel foam by a facile hydrothermal route. The as-synthesized product possesses large specific surface area and short reaction path, which result in superior electrochemical performances as the electrode of supercapacitor (SC). The obtained electrode material shows high area capacitance of 2.02 C g-1 at current density of 0.8 A g-1 with 95.3% retention of initial capacitance after 6000 cycles. Moreover, the assembled asymmetric supercapacitor (ASC) device using ZnCo2O4@Co3S4 nanowires as anode material displays noticeable electrochemical capability with an energy density of 79.8 mW h g-1 at power density of 1795 W kg-1 and 73.2 mW h g-1 at 9760 W kg-1. In addition, the device shows remarkable cycling capability, maintaining 82.2% retention after long-term cycles. It reveals the as-fabricated material would be promising energy storage materials.
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Naik, Kusha Kumar, and Chandra Sekhar Rout. "Electrodeposition of ZnCo2O4 nanoparticles for biosensing applications." RSC Advances 5, no. 97 (2015): 79397–404. http://dx.doi.org/10.1039/c5ra11011d.

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Mary, A. Juliet Christina, and A. Chandra Bose. "Surfactant assisted ZnCo2O4 nanomaterial for supercapacitor application." Applied Surface Science 449 (August 2018): 105–12. http://dx.doi.org/10.1016/j.apsusc.2018.01.117.

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Kumar, Yedluri Anil, Kulurumotlakatla Dasha Kumar, and Hee-Je Kim. "Reagents assisted ZnCo2O4 nanomaterial for supercapacitor application." Electrochimica Acta 330 (January 2020): 135261. http://dx.doi.org/10.1016/j.electacta.2019.135261.

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34

Xu, Jie, Bo Yan, Hirbod Maleki Kheimeh Sari, Youchen Hao, Dongbin Xiong, Shuming Dou, Wen Liu, Huari Kou, Dejun Li, and Xifei Li. "Mesoporous ZnCo2O4/rGO nanocomposites enhancing sodium storage." Nanotechnology 30, no. 23 (March 25, 2019): 234005. http://dx.doi.org/10.1088/1361-6528/ab0504.

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35

Ratha, Satyajit, Ruchita T. Khare, Mahendra A. More, Ranjit Thapa, Dattatray J. Late, and Chandra Sekhar Rout. "Field emission properties of spinel ZnCo2O4 microflowers." RSC Advances 5, no. 7 (2015): 5372–78. http://dx.doi.org/10.1039/c4ra10246k.

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Spinel ZnCo2O4 microflowers were synthesized by a facile route and their field emission properties were studied in detail. They showed intriguing Field emission performance in terms of good field-enhancement factor and stability.
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Schein, Friedrich-Leonhard, Markus Winter, Tammo Böntgen, Holger von Wenckstern, and Marius Grundmann. "Highly rectifying p-ZnCo2O4/n-ZnO heterojunction diodes." Applied Physics Letters 104, no. 2 (January 13, 2014): 022104. http://dx.doi.org/10.1063/1.4861648.

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37

Vijayanand, Subramanian, Pattayil A. Joy, Hari S. Potdar, Dewyani Patil, and Pradip Patil. "Nanostructured spinel ZnCo2O4 for the detection of LPG." Sensors and Actuators B: Chemical 152, no. 1 (February 2011): 121–29. http://dx.doi.org/10.1016/j.snb.2010.09.001.

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38

PEITEADO, Marco, Amador C. CABALLERO, and Darko MAKOVEC. "Thermal evolution of ZnCo2O4 spinel phase in air." Journal of the Ceramic Society of Japan 118, no. 1377 (2010): 337–40. http://dx.doi.org/10.2109/jcersj2.118.337.

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39

Saravanakumar, B., G. Ravi, R. Yuvakkumar, V. Ganesh, S. Ravichandran, M. Thambidurai, and A. Sakunthala. "Hydrothermal synthesis and electrochemical properties of ZnCo2O4 microspheres." Ionics 25, no. 1 (October 18, 2018): 353–60. http://dx.doi.org/10.1007/s11581-018-2766-1.

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40

Reyes, Patricio A., and Jorge F. Plaza De Los Reyes. "Kinetics Study of Adsorption of CO2 on ZNCO2O4." Bulletin des Sociétés Chimiques Belges 93, no. 10 (September 1, 2010): 851–56. http://dx.doi.org/10.1002/bscb.19840931003.

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41

Cossee, P. "Structure and magnetic properties of Co3O4 and ZnCo2O4." Recueil des Travaux Chimiques des Pays-Bas 75, no. 9 (September 2, 2010): 1089–96. http://dx.doi.org/10.1002/recl.19560750913.

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42

Vijayakumar, Subbukalai, Ganesh Dhakal, Soo-Hyun Kim, Jintae Lee, Yong Rok Lee, and Jae-Jin Shim. "Facile Synthesis of Zn-Co-S Nanostrip Cluster Arrays on Ni Foam for High-Performance Hybrid Supercapacitors." Nanomaterials 11, no. 12 (November 26, 2021): 3209. http://dx.doi.org/10.3390/nano11123209.

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Mixed metal sulfides exhibit outstanding electrochemical performance compared to single metal sulfides and mixed metal oxides because of their richer redox reactions and high electronic conductivity. In the present study, Zn-Co-S nanostrip cluster arrays were formed from ZnCo2O4 grown on Ni foam by an anion exchange reaction using a two-step hydrothermal process. Morphological characterization confirmed that the Zn-Co-S nanostrip cluster arrays had grown homogeneously on the skeleton of the 3D Ni foam. The length of the nanostrip was approximately 8 µm, and the width ranged from 600 to 800 nm. The Ni foam-supported Zn-Co-S nanostrip cluster arrays were assessed directly for electrochemical supercapacitor applications. Compared to ZnCo2O4, the Zn-Co-S electrode exhibited a three-fold higher specific capacity of 830 C g−1 at a specific current of 2.0 A g−1. The higher polarizability, lower electro-negativity, and larger size of the S2− ion played an important role in substituting oxygen with sulfur, which enhanced the performance. The Zn-Co-S//AC hybrid device delivered a maximum specific energy of 19.0 Wh kg−1 at a specific power of 514 W kg−1. The remarkable performance of Zn-Co-S nanostrip cluster arrays highlights their potential as a positive electrode for hybrid supercapacitor applications.
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43

Kim, Jae-Uk, Myoung-Jin Ji, Byung-Kwan Cha, Chul-Hyun Kim, Won-Cheoul Jang, and Jong-Gyu Kim. "The Study on Thermal Analysis and Thermodynamic Characteristics of Spinel Compounds(ZnCo2O4, NiCo2O4)." Journal of the Korean Chemical Society 54, no. 2 (April 20, 2010): 192–97. http://dx.doi.org/10.5012/jkcs.2010.54.02.192.

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44

Rajasekhara Reddy, Gutturu, Nadavala Siva Kumar, Borelli Deva Prasad Raju, Gnanendra Shanmugam, Ebrahim H. Al-Ghurabi, and Mohammad Asif. "Enhanced Supercapacitive Performance of Higher-Ordered 3D-Hierarchical Structures of Hydrothermally Obtained ZnCo2O4 for Energy Storage Devices." Nanomaterials 10, no. 6 (June 19, 2020): 1206. http://dx.doi.org/10.3390/nano10061206.

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The demand for eco-friendly renewable energy resources as energy storage and management devices is increased due to their high-power density and fast charge/discharge capacity. Recently, supercapacitors have fascinated due to their fast charge–discharge capability and high-power density along with safety. Herein, the authors present the synthesis of 3D-hierarchical peony-like ZnCo2O4 structures with 2D-nanoflakes by a hydrothermal method using polyvinylpyrrolidone. The reaction time was modified to obtain two samples (ZCO-6h and ZCO-12h) and the rest of the synthesis conditions were the same. The synthesized structures were systematically studied through various techniques: their crystalline characteristics were studied through XRD analysis, their morphologies were inspected through SEM and TEM, and the elemental distribution and oxidation states were studied by X-ray photoelectron spectroscopy (XPS). ZCO-12h sample has a larger surface area (55.40 m2·g−1) and pore size (24.69 nm) than ZCO-6h, enabling high-speed transport of ions and electrons. The ZCO-12h electrode showed a high-specific capacitance of 421.05 F·g−1 (31.52 C·g−1) at 1 A·g−1 and excellent cycle performance as measured by electrochemical analysis. Moreover, the morphologic characteristics of the prepared hierarchical materials contributed significantly to the improvement of specific capacitance. The excellent capacitive outcomes recommend the 3D-ZnCo2O4 hierarchical peony-like structures composed of 2D-nanoflakes as promising materials for supercapacitors with high-performance.
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Morán-Lázaro, Juan, Florentino López-Urías, Emilio Muñoz-Sandoval, Oscar Blanco-Alonso, Marciano Sanchez-Tizapa, Alejandra Carreon-Alvarez, Héctor Guillén-Bonilla, María Olvera-Amador, Alex Guillén-Bonilla, and Verónica Rodríguez-Betancourtt. "Synthesis, Characterization, and Sensor Applications of Spinel ZnCo2O4 Nanoparticles." Sensors 16, no. 12 (December 17, 2016): 2162. http://dx.doi.org/10.3390/s16122162.

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46

Nagajyoyhi, P. C., K. C. Devarayapalli, T. V. M. Sreekanth, S. V. Prabhakar Vattikuti, and Jaesool Shim. "Effective catalytic degradation of rhodamine B using ZnCO2O4 nanodice." Materials Research Express 6, no. 10 (August 28, 2019): 105069. http://dx.doi.org/10.1088/2053-1591/ab3bbf.

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47

Zhang, Linsen, and Shanshan Zhu. "Hollow polyhedral ZnCo2O4 anode materials for lithium-ion batteries." Materials Letters 236 (February 2019): 337–41. http://dx.doi.org/10.1016/j.matlet.2018.10.132.

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48

Bazuev, G. V., O. I. Gyrdasova, I. G. Grigorov, and O. V. Koryakova. "Preparation of ZnCo2O4 spinel whiskers from zinc cobalt oxalate." Inorganic Materials 41, no. 3 (March 2005): 288–92. http://dx.doi.org/10.1007/s10789-005-0125-x.

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49

Wang, Lei, Yuming Guan, Xiaolei Zhao, Jingbo Mu, Hongwei Che, Huanhuan Li, and Zengcai Guo. "ZnCo2O4@MnCo2O4 heterojunction structured nanosheets for high-performance supercapacitor." Journal of Materials Science: Materials in Electronics 29, no. 7 (January 16, 2018): 5782–90. http://dx.doi.org/10.1007/s10854-018-8549-7.

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50

Li, Baole, Ke Zhang, Shaopeng Qi, Yanmei Guo, Jinxi Chen, and Yongbing Lou. "Hierarchical ZnCo2O4-ZnO/ZnCo2O4 core-shell microarchitecture as pseudocapacitive material with ultra-high rate capability and enhanced cyclic stability for asymmetric supercapacitors." Applied Surface Science 592 (August 2022): 153202. http://dx.doi.org/10.1016/j.apsusc.2022.153202.

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