Relevant bibliographies by topics / Electrocatalytic performance

Academic literature on the topic 'Electrocatalytic performance'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Electrocatalytic performance"

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Zhou, Zhang, Wang, Wang, Xu, Wang, and Liu. "One-Step Hydrothermal Synthesis of P25 @ Few Layered MoS2 Nanosheets toward Enhanced Bi-catalytic Activities: Photocatalysis and Electrocatalysis." Nanomaterials 9, no. 11 (November 18, 2019): 1636. http://dx.doi.org/10.3390/nano9111636.

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P25 loaded few layered molybdenum disulfide (MoS2) nanosheets (P25@MoS2) are successfully synthesized through a facile one-step hydrothermal process. The bi-catalytic activities, i.e., photocatalytic and electrocatalytic activities, of the as-prepared nanomaterials have been investigated. For the as-prepared products, the photocatalytic performances were investigated by degrading simulated pollutant under sunlight irradiation, and the hydrogen evolution reaction evaluated the electrocatalytic performances. The results indicate that P25@MoS2 possesses excellent activities in both photocatalysis and electrocatalysis. The presence of MoS2 broadens the light absorption range of P25 and improves the separation and transformation efficiency of photogenerated carriers, thus improving its photocatalytic performance. The existence of P25 inhibits the aggregation of MoS2 to form more dispersed MoS2 nanosheets with only few layers increasing its active sites. Thereby, the electrocatalytic performance is heightened. The excellent multifunction makes the as-prepared P25@MoS2 a promising material in the fields of environment and energy.
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Jiang, Yuanyuan, Kai Dong, Xiaoying Yan, Chuanxia Chen, Pengjuan Ni, Cheng Yang, and Yizhong Lu. "Metal–polydopamine framework-derived (Co)/N-doped carbon hollow nanocubes as efficient oxygen electrocatalysts." Sustainable Energy & Fuels 4, no. 7 (2020): 3370–77. http://dx.doi.org/10.1039/d0se00548g.

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Hu, Yaojuan, Fengyun He, Changyun Chen, Changli Zhang, and Jingliang Liu. "Facile Controlled Synthesis of Pd-ZnO Nanostructures for Nitrite Detection." Molecules 28, no. 1 (December 23, 2022): 99. http://dx.doi.org/10.3390/molecules28010099.

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The electrocatalytic characteristics of nanostructures are significantly affected by surface structure. The strict regulation of structural characteristics is highly beneficial for the creation of novel nanocatalysts with enhanced electrocatalytic performance. This work reports a nitrite electrochemical sensor based on novel flower-like Pd-ZnO nanostructures. The Pd-ZnO nanocatalysts were synthesized through a simple hydrothermal method, and their morphology and structure were characterized via field-emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). Their electrocatalytical performance in the nitrite oxidation reaction was studied via cyclic voltammetry (CV) and the amperometric technique. Compared to pure ZnO and Pd nanoparticles, the Pd-ZnO nanostructures exhibited enhanced electrochemical performance in the nitrite oxidation reaction. In order to investigate the relationships between the structures of Pd-ZnO nanocatalysts and the corresponding electrocatalytic performances, different surface morphologies of Pd-ZnO nanocatalysts were fabricated by altering the solution pH. It was found that the flower-like Pd-ZnO nanostructures possessed larger effective surface areas and faster electron transfer rates, resulting in the highest electrocatalytic performance in the nitrite oxidation reaction. The designed nitrite sensor based on flower-like Pd-ZnO displayed a wide concentration linear range of 1 μM–2350 μM, a low detection limit of 0.2 μM (S/N of 3), and high sensitivity of 151.9 μA mM−1 cm−2. Furthermore, the proposed sensor exhibited perfect selectivity, excellent reproducibility, and long-time stability, as well as good performance in real sample detection.
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Huang, Yao, Meiling Song, Cuihua Tian, Yiqiang Wu, Yuyan Li, Ning Yan, and Yan Qing. "Fundamental understanding of electrochemical catalytic performance of carbonized natural wood: wood species and carbonization temperature." Sustainable Energy & Fuels 5, no. 23 (2021): 6077–84. http://dx.doi.org/10.1039/d1se01259b.

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The pore structure and carbonization temperature of wood have a great influence on the electrocatalytic performance of wood carbon. This work is of great significance for the selection of suitable wood carbon substrate materials for electrocatalysis.
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Chen, Zheng, Zhaoyang Wang, Ying Tian, Zhengkun Li, Zhenhua Ren, Juan Wang, Sufei Liu, Ruozheng Li, and Jilin Teng. "Performance Study and Assessment of Electrocatalytic Treatment of Substation Domestic Sewage." Journal of Physics: Conference Series 2401, no. 1 (December 1, 2022): 012044. http://dx.doi.org/10.1088/1742-6596/2401/1/012044.

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Abstract In China, the power grid construction process is accelerating. At the same time, the requirements for power grid water environment management are also constantly improving. There are a large number of substations and most of them are located in the countryside and surrounded by farmland. Therefore, it is important to treat the domestic sewage of the substation to meet the relevant standards. Recently, electrocatalysis technology has attracted much attention because of its high efficiency and no secondary pollution such as sludge. However, there are few reports on the application and performance evaluation of electrocatalytic treatment of domestic sewage in substations. Therefore, the experimental research aims to treat domestic sewage in substations reaching the corresponding standard. The optimal operating parameters and comprehensive performance assessment of the electrocatalysis technology are investigated, applying iridium-tantalum, ruthenium-iridium, boron-doped diamond anodes, titanium cathodes, and carbon fiber cathodes. The results show that the application of the three anodes can efficiently treat the sewage reaching the corresponding standard, indicating that electrocatalysis is suitable for the treatment of domestic sewage in substations. Moreover, comprehensively considering cost, treatment effect, energy consumption, and reaction temperature, the composite performance of iridium tantalum anode and Ti cathode is the best. In summary, this paper provides a comprehensive study and assessment of the performance of electrocatalytic treatment of domestic sewage in substations, providing theoretical support for the water environment management of power grids.
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Hu, Jing, Adel Al-Salihy, Bin Zhang, Siwei Li, and Ping Xu. "Mastering the D-Band Center of Iron-Series Metal-Based Electrocatalysts for Enhanced Electrocatalytic Water Splitting." International Journal of Molecular Sciences 23, no. 23 (December 6, 2022): 15405. http://dx.doi.org/10.3390/ijms232315405.

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The development of non-noble metal-based electrocatalysts with high performance for hydrogen evolution reaction and oxygen evolution reaction is highly desirable in advancing electrocatalytic water-splitting technology but proves to be challenging. One promising way to improve the catalytic activity is to tailor the d-band center. This approach can facilitate the adsorption of intermediates and promote the formation of active species on surfaces. This review summarizes the role and development of the d-band center of materials based on iron-series metals used in electrocatalytic water splitting. It mainly focuses on the influence of the change in the d-band centers of different composites of iron-based materials on the performance of electrocatalysis. First, the iron-series compounds that are commonly used in electrocatalytic water splitting are summarized. Then, the main factors affecting the electrocatalytic performances of these materials are described. Furthermore, the relationships among the above factors and the d-band centers of materials based on iron-series metals and the d-band center theory are introduced. Finally, conclusions and perspectives on remaining challenges and future directions are given. Such information can be helpful for adjusting the active centers of catalysts and improving electrochemical efficiencies in future works.
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Li, Dongmei, Wenjie Li, Quan Zhang, Yizhi Wang, Hongyu Lin, Li Feng, Shaoxiu Li, et al. "Generation of active Co(III) and peroxodiphosphate by synergistic electrocatalytic system with phosphate and the mediator cobalt(II) and its degradation performance." Water Science and Technology 83, no. 4 (January 12, 2021): 841–53. http://dx.doi.org/10.2166/wst.2021.017.

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Abstract The promising synergistic electrocatalytic system of phosphate (PO43−) with the mediator cobalt(II) (for short E-Co(II)-PO43−) was employed to degrade cationic dye methylene blue (MB). The exploration in the electrocatalytic process revealed that the main intermediate active oxidation products were Co(III), accompanied with hydroxyl radicals and peroxodiphosphates (P2O84−). Their synergistic electrocatalytic degradation rate to MB and total organic carbon (TOC) was up to 100 and 60% in 40 min, respectively, which was 5 times and 2.6 times that in a direct electrocatalytic system, correspondingly. The degradation process of the E-Co(II)-PO43− system on MB started with the bond being broken at the N-C junction of the MB molecule and intermediate active oxidation substances being generated, such as phenothiazine, 2-amino-5-(N-methylformamide) benzene sulfonic acid and N1,N1-dimethyl-1,4 diaminobenzene. Then, the intermediates were degraded into aniline, phenol and benzene sulfonic acid, and eventually decomposed into inorganic substances like CO2 and water. The electrocatalytic degradation mechanism of E-Co(II)-PO43− system on MB was the combination of indirect oxidation of the intermediate oxidants like Co(III), P2O84− and the hydroxyl radical with direct electrocatalysis on the platinum titanium electrode, where the electrocatalytic oxidation of Co(III) was dominant.
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Elias, Liju, and Ampar Chitharanjan Hegde. "Electrodeposition and Electrocatalytic Study of Ni-W Alloy Coating." Materials Science Forum 830-831 (September 2015): 651–54. http://dx.doi.org/10.4028/www.scientific.net/msf.830-831.651.

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Electrocatalytically active Ni-W alloy coatings have been developed through compositionally versatile electrodeposition method on copper substrate from tri-sodium citrate bath, using glycerol as the additive. The deposition conditions have been optimized for peak performance of their electrocatalytic behavior, like hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1M KOH. Corrosion behaviors of the coatings have also been tested under study conditions of electrocatalysis. Electrocatalytic behaviors were tested by cyclic voltammetry (CV) and chronopotentiometry techniques. Experimental results demonstrated that Ni-W alloy coatings, deposited at low and high current densities (c. d.) were showing superior performance for OER and HER, respectively. Better electrocatalytic activity for HER with increase of deposition c. d. was attributed by the unique phase structure, surface morphology and chemical composition of the coatings, confirmed by XRD, SEM and EDX analysis. The dependency of coating thickness and hardness on HER and OER were analyzed, and results are discussed.
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Huang, Aijian, and Zhiguo Wang. "Unveiling the HER and ORR activity origin of isolated Co sites supported on N-doped carbon." MATEC Web of Conferences 363 (2022): 01001. http://dx.doi.org/10.1051/matecconf/202236301001.

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Electrocatalysis plays very important role in clean energy conversion. In which, developing high active and robust electrocatalysts for the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) are highly crucial and challenging. Using density functional theory (DFT) calculations, the Gibbs free energy diagrams and electronic structure of N-graphene, Ir-N4 and Co-N4 are investigated in this work. The results show that Co-N4 have the appropriate H adsorption and lower ORR overpotentials, which gives expectation of high multifunctional electrocatalytic performance. This theoretical study provides vital insights into the enhanced electrocatalytic mechanism of Co sites supported on N-doped carbon.
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Lei, Xin, Bo Liu, Payam Ahmadian Koudakan, Hongge Pan, Yitai Qian, and Gongming Wang. "Single-atom catalyst cathodes for lithium–oxygen batteries: a review." Nano Futures 6, no. 1 (February 4, 2022): 012002. http://dx.doi.org/10.1088/2399-1984/ac3ec1.

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Abstract Recently, single-atom catalysts (SACs) have been found to be promising candidates for oxygen electrocatalysis in rechargeable lithium–oxygen batteries (LOBs) owing to their high oxygen electrocatalytic activity and high stability, which originates from their unique coordination environments and electronic properties. As a new type of catalyst for LOBs, the advancements have never been reviewed and discussed comprehensively. Herein, breakthroughs in the design of various types of SACs as cathode catalysts for LOBs are summarized, including Co-based, Ru-based, and other types of SACs. Moreover, considerable emphasis is placed on the correlations between the structural feature of the SAC active sites and the electrocatalytic performance of LOBs. Finally, an overview and challenges of SACs for practical LOBs are also provided. This review provides an intensive understanding of SACs for designing efficient oxygen electrocatalysis and offers useful guidelines for the development of SACs in the field of LOBs.
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Dissertations / Theses on the topic "Electrocatalytic performance"

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Blasco, Ahicart Marta. "Earth Abundant Materials for Electrocatalytic Water Oxidation: Enhancing Efficiency and Robust Performance in Acidic, Neutral and Alkaline Media." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/457706.

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En aquesta tesi doctoral presentem diferents estratègies per al desenvolupament d’elèctrodes, basats en elements abundants en l’escorça terrestre, actius en l’oxidació electrocatalítica de l’aigua en diferents medis. En primer lloc, hem precipitat el clúster [Co9(H2O)6(OH)3(HPO4)2(PW9O34)3]16− (Co9) amb Ba2+ i Cs+ per obtindre sals insolubles en aigua que poden ser mesclades amb una matriu conductora, com la pasta de carboni. Els elèctrodes de BaCo9 presenten una activitat excel·lent en medi àcid, combinada amb 100% d’eficiència Faradàica i estabilitat a llarg termini. En segon lloc, el clúster nonanuclear Co9 també ha estat combinat amb un polímer conductor (polipirrol) per obtenir elèctrodes híbrids orgànic-inorgànics actius en l’oxidació electrocatalítica de l’aigua en medi neutre. Aquest mètode de processament és molt interessant, ja que proporciona elèctrodes versàtils a partir de materials barats i abundants. Finalment, hem analitzat òxids binaris i ternaris amb diferent composició (Ni, Zn, Fe i Cr) per millorar l’activitat dels òxids metàl·lics front l’oxidació catalítica d’aigua en medi bàsic. Aquells compostos amb fase espinela i -Fe2O3 hematita presenten elevada eficiència combinada amb bona estabilitat a llarg termini.
En la presente tesis doctoral presentamos diferentes estrategias para desarrollar electrodos, basados en elementos abundantes en la corteza terrestre, activos en la oxidación electrocatalítica del agua en diferentes medios. En primer lugar, hemos precipitado el clúster [Co9(H2O)6(OH)3(HPO4)2(PW9O34)3]16− (Co9) con Ba2+ i Cs+ para obtener sales insolubles en agua que pueden ser mezcladas con una matriz conductora, como la pasta de carbono. Los electrodos de BaCo9 presentan una actividad excelente en medio ácido, combinada con 100% de eficiencia Faradaica y estabilidad a largo plazo. En segundo lugar, el clúster nonanuclear Co9 también ha sido combinado con un polímero conductor (polipirrol) para obtener electrodos híbridos orgánico-inorgánicos activos en la oxidación electrocataítica del agua en medio neutro. Este método de procesamiento es muy interesante, ya que proporciona electrodos versátiles a partir de materiales baratos y abundantes. Finalmente, hemos analizado óxidos binarios y ternarios con diferente composición (Ni, Zn, Fe i Cr) para mejorar la actividad de los óxidos metálicos frente a la oxidación electrocatalítica del agua en medio básico. Los compuestos con fase espinela y -Fe2O3 hematita presentan elevada eficiencia combinada con buena estabilidad a largo plazo.
In this Doctoral Thesis, different approaches to develop suitable working anodes based on Earth abundant metals for the electrocatalytic water oxidation reaction in different media have been presented. We have precipitated the nonanuclear cobalt cluster [Co9(H2O)6(OH)3(HPO4)2(PW9O34)3]16− (Co9) with Ba2+ and Cs+ to obtain water-insoluble salts that can be blended with a solid-state matrix, such as carbon paste. The BaCo9 have shown excellent and unparalleled performance for the electrocatalytic water oxidation in acidic media, yielding 100% Faradaic efficiency matched with good long-term stability. We have also incorporated the homogeneous Co9 POM into a conducting polymer matrix (i. e. polypyrrole) to obtain organic-inorganic anodes active in electrocatalytic water oxidation reaction in neutral conditions. This interesting processing approach has yielded versatile electrodes obtained from low cost and available raw materials. Finally, we have screened binary and ternary mixed oxide compositions, based on Ni, Zn, Fe and Cr, for the enhancement of electrocatalytic water oxidation in alkaline media. Cubic spinel phases, as well as, -Fe2O3 hematite have shown best efficiency combined with good long-term stability under working conditions.
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Lively, Treise. "Ethanol fuel cell electrocatalysis : novel catalyst preparation, characterization and performance towards ethanol electrooxidation." Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602560.

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Schwämmlein, Jan Nicolas [Verfasser], Hubert A. [Akademischer Betreuer] Gasteiger, Matthias [Gutachter] Arenz, Kai-Olaf M. [Gutachter] Hinrichsen, and Hubert A. [Gutachter] Gasteiger. "Performance and Durability of Ion Exchange Membrane Fuel Cells – From Electrocatalysis to Single Cells / Jan Nicolas Schwämmlein ; Gutachter: Matthias Arenz, Kai-Olaf M. Hinrichsen, Hubert A. Gasteiger ; Betreuer: Hubert A. Gasteiger." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1222161672/34.

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Chen, Jian-Yi, and 陳鍵誼. "Microwave-assisted synthesis and electrocatalytic performance of nano carbon supporting Pt, PtRu catalyst." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/09677845004008353061.

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碩士
元智大學
化學工程與材料科學學系
99
Grapene oxide (GO) was made by modified Hummers method. The catalyst precursors were reduced and deposited on nano carbon supports by microwave-assisted synthesis. The electrocatalytic performances of catalysts were investigated in three-electrode electrochemical cells. Three parts of this study were performed as following. Part 1: GO was made by modified Hummers method. Part 2: using metal precursor, different carbon materials and different polyols were used to synthesize nanoparticle catalysts by microwave – polyol method. Part 3: catalysts were prepared and assembled into electrode for electrochemical measurements by cyclic voltammetry. The characteristics of Pt nanoparticles are studied using FTIR, TEM, XRD and electrochemical analysis. In different ratios of GO/MWNT, Pt/MWNT_EG has the highest ESA value (138.01 m2/g) due to the most functional groups existed on surface of MWNTs. In comparison of If/Ib, the best CO-tolerance occurs for Pt/GO_EG with value of 0.92 due to that the remaining functional groups like –COOH and –OH groups on GO can convert CO into CO2. For the polyol effect on microwave-polyol method, the maximum electrochemical active surface area 126.52 m2/g for Pt/GO-MWNT_EG, due to the steric hindrance effect of EG. PtRu/GO_PG has a higher ESA (32.47 m2/g) due to its smaller particles and better dispersion. The If/Ib value of 1.19 observed for PtRu/GO_TTEG is attributed to its smallest particle size from TEM images. The ESA 104.6 m2/g for a PtRu/GO-MWNT_EG, is a result of better steric hindrance effect and better dispersion of catalysts. The very low Ib, occurs for PtRu/GO-MWNT_TTEG speculating an increase of PtRu alloy degree, which improves the CO-tolerance of catalyst.
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Hu, Ting-Zhen, and 胡庭禎. "Electrochemical Synthesis of Nanostrucutred Platinum on a Flexible Substrate and its Electrocatalytic Performance." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/26363325486668407112.

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碩士
國立交通大學
應用化學系碩博士班
104
In this study, we deposited Pt nanodendrites (Pt NDs) and Pt nanoflowers (Pt NFs) on a flexible carbon substrate in simple two-electrode system at room temperature. By controlling the concentration of surfactant and electric aid agent, we obtained various Pt structures. Because the surfactant and electric aid agent assist the Pt growth on special orientation, we discussed these factors on Pt structures in detail. Then, we proposed the possible growth mechanism for Pt . In the hydrogen electrosorption test, we got the Pt NDs with electrochemical active surface area (ECSA) 27.86 m2/g, and the Pt NFs with ECSA 54.15 m2/g. The ECSA of commercial Pt/C is around 43.80 m2/g. In methanol oxidation reaction test, the onset potentials of Pt NDs and Pt NFs are 0.460 V and 0.459 V, respectively.
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Jheng, Shao-Lou, and 鄭少樓. "Syntheses and Electrocatalytic Hydrogen Evolution Performance of Ge-Ni and Ge-Pd Alloy Nanomaterials." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/f4f782.

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Ming-YaoLi and 李明曜. "Electrocatalytic performance of rGO/WO3/MoS2 nanocomposite and its application for hydrogen evolution reaction of water splitting." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/9e9kpe.

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Cheng, Hao-Sheng, and 鄭皓升. "Study of high performance non-platinum NiRu catalyst for electrocatalytic hydrogen evolution and oxidation reactions in alkaline electrolyte." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/x8a98x.

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碩士
國立臺灣科技大學
化學工程系
105
In this study, the nickel (Ni)-ruthenium (Ru) bimetallic catalysts with different Ni/Ru ratios were successfully loaded on high-surface-area carbon black by using hydrothermal method. The bimetallic Pt-free catalyst shows a Pt-like activity and highly durable in alkaline hydrogen oxidation (HOR)/evolution (HER) reactions. Through the materials characterization, the particle size distribution for Ni-Ru catalyst was observed as around 2 ~ 3 nm compared to Ru/C which shows around 2 nm. In the results of X-ray absorption spectroscopy the alloy extent of the NixRuy/C catalysts gets increased with increasing Ru content, while particle agglomeration is found by excess Ni content. Higher alloy extent can be found in the Ni/Ru ratio of 1 and 1/3 which leads to more uniform surface composition. Reaction mechanism of the alkaline HOR has been widely discussed but still debated. Here we combined the experiments and the theoretical computation to propose a synergistic effect for alkaline HOR rather than only electronic effect. The results of CO stripping for Ru-based catalyst evidence the electron transfer from Ni to Ru because of negative shift of onset potential by addition of Ni, in which the electronic effect can be involved to weaken hydrogen binding energy. On the other hand, the computational results show the weakening adsorption of OH group on the Ni-Ru interfacial sites of the alloy surfaces, which may facilitate the Volmer step and enhance HOR performance. For alkaline HOR/HER, Ni-Ru bimetallic catalyst exhibits an excellent activity as well as competitive performance to commercial Pt catalyst (Pt/C), which attributes to the synergistic effect. Moreover, the stability test for the bimetallic catalyst is much better than the Pt/C catalyst, indicating that the Ni-Ru catalyst has their potential to develop.
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Siahaan, Asnidar, and 史妮達. "Decoration of Au-Pt nanoparticles on tubular graphene architectures for the enhancement of electrocatalytic performance in direct methanol fuel cells." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/jm9w8s.

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碩士
國立中正大學
物理系研究所
105
In this work, tubular graphene architectures as supporting materials for the decoration of Au-Pt nanoparticles (NPs) can enhance the electrocatalytic activity in direct methanol fuel cells. Au-Pt heterostructures were successfully decorated on tubular graphene surface with different concentrations and used as electrocatalysts for methanol oxidation. The activities of electrocatalysts were strongly improved in the presence of Au-Pt NPs, which were evidenced by the increase of the forward peak current densities in the cyclic voltammetry (CV) curves. Furthermore, the enhancement of the ratios between the forward and backward peak current densities of the CV curves shows the good tolerant ability towards the poisoning effect of intermediate carbonaceous species. The morphology and properties of Au-Pt decorated tubular graphene structures were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, electrochemical measurements and Raman spectroscopy techniques. The goal of the research is using tubular graphene meshes as supporting materials for enhancing the electrocatalytic in direct methanol fuel cells. Keywords : Graphene tube, Au-Pt nanoparticles, methanol oxidation, direct methanol fuel cell, Electrocatalyst
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Lyke, Stephen Erwin. "Anodic oxidation of sulfur dioxide electrocatalysis and reactor performance analysis /." 1991. http://catalog.hathitrust.org/api/volumes/oclc/24296873.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1991.
Vita. Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 261-278).
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Book chapters on the topic "Electrocatalytic performance"

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Hu, Jing, Yuanyuan Zhang, and Ping Xu. "Improving the Electrocatalytic Performance by Defect Engineering and External Field Regulation." In Advanced Electrochemical Materials in Energy Conversion and Storage, 329–75. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003133971-13.

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Jayabal, Subramaniam, and Dongsheng Geng. "Chapter 9. High Electrocatalytic Performance of Two-dimensional Layered MoS2-based Materials for the Hydrogen Evolution Reaction." In Smart Materials Series, 283–310. Cambridge: Royal Society of Chemistry, 2019. http://dx.doi.org/10.1039/9781788016193-00283.

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Liu, Bao, Shuo Wang, Qiankun Jing, and Chengyan Wang. "Effects of Precursor Concentration on the Surface Morphology and Electrocatalytic Performance of Ti/IrO2–RuO2–SiO2 Anode for Oxygen Evolution Reaction." In TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings, 1281–91. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-36296-6_118.

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ul Haq, Tanveer, and Yousef Haik. "Electrocatalysis for the Water Splitting: Recent Strategies for Improving the Performance of Electrocatalyst." In Advances in Sustainable Energy, 315–39. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74406-9_11.

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Rajkumar, M. "Bioinspired Nanostructured Materials for Energy-Related Electrocatalysis." In Bioinspired Nanomaterials for Energy and Environmental Applications, 117–40. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901830-4.

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Conventional synthetic methods are facing great challenges to prepare functional nanostructures with fine design, tunable property, high efficiency and good sustainability. In recent decades, bioinspired synthesis has been extensively applied for the synthesis of nanomaterials with fascinating properties. Modifying the electrodes with bioinspired nanomaterials is of great interest because of their unique advantages and outperforming characteristics. In this chapter, the recent progresses on the bio-inspired synthesis of nanomaterials and their applications in energy-related electrocatalysis are focussed. The general mechanisms of key electrocatalytic processes such as oxygen evolution reaction (OER), hydrogen evolution reaction (HER), oxygen reduction reaction (ORR), methanol oxidation and formic acid oxidation reactions are discussed. Importantly, the characterization of bio-inspired nanomaterials and their enhanced energy-relevant electrocatalytic properties in terms of onset potential, peak current density and durability are elaborately reviewed. The chapter is concluded with the advantages and limitations of bioinspired methodology and the possible solutions to improve the electrocatalytic performance in the future.
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Nazir, Roshan, Abhay Prasad, Ashish Parihar, Mohammed S. Alqahtani, and Rabbani Syed. "Colloidal Nanocrystal-Based Electrocatalysts for Combating Environmental Problems and Energy Crisis." In Colloids - Types, Preparation and Applications. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95338.

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The serious threat that human beings face in near future will be shortage of fossil fuel reserves and abrupt changes in global climate. To prepare for these serious concerns, raised due to climate change and shortage of fuels, conversion of excessive atmospheric CO2 into valuable chemicals and fuels and production of hydrogen from water splitting is seen most promising solutions to combat the rising CO2 levels and energy crises. Amoung the various techniques that have been employed electrocatalytic conversion of CO2 into fuels and hydrogen production from water has gained tremendous interest. Hydrogen is a zero carbon-emitting fuel, can be an alternative to traditional fossil fuels. Therefore, researchers working in these areas are constantly trying to find new electrocatalysts that can be applied on a real scale to deal with environmental issues. Recently, colloidal nanocrystals (C-NCs)-based electrocatalysts have gained tremendous attention due to their superior catalytic selectivity/activity and durability compared to existing bulk electrodes. In this chapter, the authors discuss the colloidal synthesis of NCs and the effect of their physiochemical properties such as shape, size and chemical composition on the electrocatalytic performance and durability towards electrocatalytic H2 evolution reaction (EH2ER) and electrocatalytic CO2 reduction reactions (ECO2RR). The last portion of this chapter presents a brief perspective of the challenges ahead.
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Huang, Yi-June, and Chuan-Pei Lee. "Nanostructured Transition Metal Compounds as Highly Efficient Electrocatalysts for Dye-Sensitized Solar Cells." In Solar Cells [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94021.

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Nowadays, the requirement of energy increases every year, however, the major energy resource is fossil fuel, a limiting source. Dye-sensitized solar cells (DSSCs) are a promising renewable energy source, which could be the major power supply for the future. Recently, the transition metal component has been demonstrated as potential material for counter electrode of platinum (Pt)-free DSSCs owing to their excellent electrocatalytic ability and their abundance on earth. Furthermore, the transition metal components exist different special nanostructures, which provide high surface area and various electron transport routs during electrocatalytic reaction. In this chapter, transition metal components with different nanostructures used for the application of electrocatalyst in DSSCs will be introduced; the performance of electrocatalyst between intrinsic heterogeneous rate constant and effective electrocatalytic surface area are also be clarified. Final, the advantages of the electrocatalyst with different dimensions (i.e., one to three dimension structures) used in DSSCs are also summarized in the conclusion.
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Liang, Hong, Hong Huang, Liying Zhao, Qingchun Wang, Yangmin Ren, Youli Yang, Qiang Zheng, Yi Liu, and Jie Lv. "Preparation of Co-TiO2 Nanotube Array Electrode for the Electrocatalytic Degradation of Chlorine-Containing Wastewater." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220332.

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Shale gas fracturing flowback fluid is produced during shale gas exploitation, and its complex composition and high chloride content result in limited efficiency of conventional technology. In this work, the Co-TiO2 nanotube array (Co-TiO2 NTAs) electrode with high chlorine evolution activity was successfully prepared by electrodeposition for the treatment of containing chlorine PAM simulated wastewater. The internal morphology, crystal structure, and electrochemical characteristics of the nanotubes were analyzed by scanning electron microscopy, X-ray diffraction, energy dispersive spectrometry, and linear sweep voltammetry. The electrochemical catalytic oxidation activity toward chlorine evolution reaction and degradation against polyacrylamide (PAM) in chlorine-containing wastewater were investigated. The results demonstrated that the chlorine evolution potential of the TiO2 NTAs electrode was decreased after loading 0.0333 mg/cm2 of cobalt by bipolar pulse electrodeposition. The results showed that the removal rate of chemical oxygen demand (CODcr) was 62.7% and the yield of active chlorine (ACl) was 45.2 mg/L after 1 hour of electrolysis, which were attributed to the excellent catalytic performance of the novel electrodes for the degradation of polyacrylamide. Combined with the characterization results of GC-MS and IR, the degradation mechanism of PAM was briefly described. The results indicated that the novel Co-TiO2 NTAs electrodes have a broad application prospect in electrochemical oxidation-catalytic degradation of high chlorine containing wastewater.
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Xu, Qian, Jiajia Zhang, and Chunzhen Yang. "Nickel Foam Electrode with Low Catalyst Loading and High Performance for Alkaline Direct Alcohol Fuel Cells." In Electrocatalysis [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.100287.

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Nickel foam has a unique three-dimensional (3-D) network structure that helps to effectively utilize catalysts and is often used as an electrode support material for alkaline direct alcohol fuel cells. In this chapter, first, the effect of nickel foam thickness on cell performance is explored. The results show that the thickness affects both mass transfer and electron conduction, and there is an optimal thickness. The thinner the nickel foam is, the better the conductivity is. However, the corresponding three-dimensional space becomes narrower, which results in a partial agglomeration of the catalyst and the hindrance of mass transfer. The cell performance of 0.6 mm nickel foam electrode is better than that of 0.3 and 1.0 mm. Secondly, to fully exert the catalytic function of the catalyst even at a lower loading, a mixed acid-etched nickel foam electrode with lower Pd loading (0.35 mg cm−2) is prepared then by a spontaneous deposition method. The maximum power density of the single alkaline direct ethanol fuel cell (ADEFC) can reach 30 mW cm−2, which is twice the performance of the hydrochloric acid treated nickel foam electrode. The performance improvement is attributed to the micro-holes produced by mixed acids etching, which enhances the roughness of the skeleton and improves the catalyst electrochemical active surface area.
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Long Quan, Dang, and Phuoc Huu Le. "Recent Advances in Pt-Based Binary and Ternary Alloy Electrocatalysts for Direct Methanol Fuel Cells." In Electrocatalysis [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95940.

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The direct methanol fuel cell (DMFC) is among the most promising alternative energy sources for the near future owing to its advantages of simple construction, compact design, high energy density, and relatively high energy-conversion efficiency. Typically, the electrodes in DMFC is comprised of a Pt-based catalysts supported on great potential of carbon materials such as multi-walled carbon nanotubes (MWCNTs), carbon black (CB), graphene, etc. It is desired to develop an electrode with high surface area, good electrical conductivity and suitable porosity to allow good reactant flux and high stability in the fuel cell environment. This chapter will provide recent advances in Pt-based binary and ternary electrocatalysts on carbon supports for high-performance anodes in DMFC. Through studying the effects of composition-, support-, and shape dependent electrocatalysts, further fundamental understanding and mechanism in the development of anode catalysts for DMFC will be provided in details.
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Conference papers on the topic "Electrocatalytic performance"

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Mesa, Camilo A., Francisco Fabregat-Santiago, Elena Mas-Marzá, and Sixto Giménez. "The effect of oxygen vacancies in the photoelectrochemical performance of metal oxide photoanodes." In International Conference on Frontiers in Electrocatalytic Transformations. València: FUNDACIO DE LA COMUNITAT VALENCIANA SCITO, 2022. http://dx.doi.org/10.29363/nanoge.interect.2022.021.

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Lu, Xinhua. "Synthesis of Graphene Supported Nanocatalyst and Its Electrocatalytic Performance for Methanol Oxidation." In 2018 3rd International Workshop on Materials Engineering and Computer Sciences (IWMECS 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/iwmecs-18.2018.29.

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Idrissi, Siham, Zineb Edfouf, Omar Benabdallah, Abdelfettah Lallaoui, Qiliang Wei, Xiaohua Yang, Shuhui Sun, and Fouzia Cherkaoui El Moursli. "Electrocatalytic Performance of Reduced Graphene Oxide Based Materials for Oxygen Reduction Reaction (ORR)." In 2017 International Renewable and Sustainable Energy Conference (IRSEC). IEEE, 2017. http://dx.doi.org/10.1109/irsec.2017.8477306.

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Jiang, Tao, Yan Wang, Ghislain Montavon, Hanlin Liao, Taikai Liu, Regine Reissner, and Syed Asif Ansar. "Engineered Thermal Sprayed Oxygen Evolution Electrode for Hydrogen Production by Alkaline Water Electrolysis." In ITSC2019, edited by F. Azarmi, K. Balani, H. Koivuluoto, Y. Lau, H. Li, K. Shinoda, F. Toma, J. Veilleux, and C. Widener. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.itsc2019p0388.

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Abstract This study shows how HVOF-sprayed NiAl coatings produced using chemical and electrochemical activation processes can serve as oxygen evolution electrodes in alkaline water electrolysis systems. Freestanding hierarchical NiAl structures produced without chemical binders exhibit electrocatalytic performance comparable to state-of-the-art noble catalysts characterized by very low overpotential and high current density without degradation.
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Chen, Yangbo, Yuwei Tang, Zhoumiao Liao, Xiaoyang Chen, and Juan Wang. "Effects of surface treatment on the electrocatalytic performance of Spinel NiCo2O4 and Carbon Nanotubes composite catalysts." In 2017 3rd International Forum on Energy, Environment Science and Materials (IFEESM 2017). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/ifeesm-17.2018.371.

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El-Dera, Sandra Erfan, Ahmed Abd El Aziz, and Ahmed Abd El Moneim. "Evaluation of the Activity of Metal-Oxides as Anode Catalysts in Direct Methanol Fuel Cell." In ASME 2012 10th International Conference on Fuel Cell Science, Engineering and Technology collocated with the ASME 2012 6th International Conference on Energy Sustainability. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/fuelcell2012-91288.

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In the present work, pure iridium oxide (IrO2), and ternary catalysts (IrSnSb-Oxides and RuIrTi-Oxides) are investigated to be used as anode electrocatalysts in The Direct Methanol Fuel Cells (DMFC). Investigations of Methanol Oxidation and Hydrogen Evolution over the catalysts are measured in sulphuric acid as a supportive electrolyte using cyclic voltammetry technique at room temperature (25°C). A specific comparison between the electrocatalytic activities of IrSnSb-Oxides and RuIrTi-Oxides systems is conducted. A comprehensive examination of IrSnSb-Oxides and RuIrTi-Oxides catalysts containing different fractions of the alloying elements are performed to study the effect of varying Iridium Ir content (%) in IrSnSb-Oxides and Ruthenium Ru content (%) in RuIrTi-Oxides on the catalytic activity of ternary catalysts and on the performance of DMFC. It is observed that the electrocatalytic performance of ternary oxides catalysts is strongly dependent on the Ir and Ru content. The generated IrO2 and 33.36% Ru – 1%Ir – 65.64%Ti – Oxides catalysts prove high stability for oxidation of methanol and more proficient electrochemical activity as an anodic electrocatalyst in DMFC at 25°C. The electrochemical measurements of the Hydrogen Evolution Reaction (HER) for metal oxides show that 46.65%Ir – 40.78%Sn – 12.57%Sb sample and 18.75%Ru – 9.35%Ir – 71.9%Ti sample are the superior hydrogen evolution catalysts at 25°C.
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Chai, Rukaun, Yuetian Liu, Qianjun Liu, Xuan He, and Pingtian Fan. "Effect and Mechanism of CO2 Electrochemical Reduction for CCUS-EOR." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206135-ms.

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Abstract Unconventional reservoir plays an increasingly important role in the world energy system, but its recovery is always quite low. Therefore, the economic and effective enhanced oil recovery (EOR) technology is urgently required. Moreover, with the aggravation of greenhouse effect, carbon neutrality has become the human consensus. How to sequestrate CO2 more economically and effectively has aroused wide concerns. Carbon Capture, Utilization and Storage (CCUS)-EOR is a win-win technology, which can not only enhance oil recovery but also increase CO2 sequestration efficiency. However, current CCUS-EOR technologies usually face serious gas channeling which finally result in the poor performance on both EOR and CCUS. This study introduced CO2 electrochemical conversion into CCUS-EOR, which successively combines CO2 electrochemical reduction and crude oil electrocatalytic cracking both achieves EOR and CCUS. In this study, multiscale experiments were conducted to study the effect and mechanism of CO2 electrochemical reduction for CCUS-EOR. Firstly, the catalyst and catalytic electrode were synthetized and then were characterized by using scanning electron microscope (SEM) & energy dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). Then, electrolysis experiment & liquid-state nuclear magnetic resonance (1H NMR) experiments were implemented to study the mechanism of CO2 electrochemical reduction. And electrolysis experiment & gas chromatography (GC) & viscosity & density experiments were used to investigate the mechanism of crude oil electrocatalytic cracking. Finally, contact angle and coreflooding experiments were respectively conducted to study the effect of the proposed technology on wettability and CCUS-EOR. SEM & EDS & XPS results confirmed that the high pure SnO2 nanoparticles with the hierarchical, porous structure, and the large surface area were synthetized. Electrolysis & 1H NMR experiment showed that CO2 has converted into formate with the catalysis of SnO2 nanoparticles. Electrolysis & GC & Density & Viscosity experiments indicated that the crude oil was electrocatalytically cracked into the light components (<C20) from the heavy components (C21∼C37). As voltage increases from 2.0V to 7.0V, the intensity of CO2 electrocchemical reduction and crude oil electrocatalytic cracking enhances to maximum at 3.5V (i.e., formate concentration reaches 6.45mmol/L and carbon peak decreases from C17 to C15) and then weakens. Contact angle results indicated that CO2 electrochemical reduction and crude oil electocatalytic cracking work jointly to promote wettability alteration. Thereof, CO2 electrochemical reduction effect is dominant. Coreflooding results indicated that CO2 electrochemical reduction technology has great potential on EOR and CCUS. With the SnO2 catalytic electrode at optimal voltage (3.5V), the additional recovery reaches 9.2% and CO2 sequestration efficiency is as high as 72.07%. This paper introduced CO2 electrochemical conversion into CCUS-EOR, which successfully combines CO2 electrochemical reduction and crude oil electrocatalytic cracking into one technology. It shows great potential on CCUS-EOR and more studies are required to reveal its in-depth mechanisms.
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Shaikh, Naznin, and Abhijit Ray. "Electrocatalytic Performance of Bimetallic Ni-Mo Alloy with Thermally Modulated Microstructure for Hydrogen Generation at Ultra-Low Overpotential in Acidic Media." In 2022 IEEE 12th International Conference Nanomaterials: Applications & Properties (NAP). IEEE, 2022. http://dx.doi.org/10.1109/nap55339.2022.9934564.

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McGrath, Kimberly, and Douglas Carpenter. "Improved Electrocatalytic Activity of Oxygen Reduction on Platinum Using Nano-Cobalt in Direct Methanol Fuel Cell Cathode Electrodes." In ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2006. http://dx.doi.org/10.1115/fuelcell2006-97198.

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High surface area nanometal particles of nano-cobalt (n-Co) (approx 8 nm particles), produced at QuantumSphere Inc., were blended in various ratios with Pt and Nafion® ionomer, and investigated for their electrocatalytic activity in the oxygen reduction reaction (ORR). The ORR was evaluated by voltammetry using Pt/n-Co blended catalyst on glassy carbon to determine both kinetic activity and as an indicator of direct methanol fuel cell (DMFC) cathode performance. Kinetic enhancement was observed for Pt:n-Co where n-Co is 30–50% (by weight) of the catalyst mixture, including a minimum of 10 mV improvement in the open circuit voltage (OCV). By Tafel slope measurements, it is clear that the mechanism for ORR does not change, however the reaction rate is enhanced by addition of n-Co to Pt in the catalytic ink. For ink compositions similar to those used for standard DMFC cathodes, eliminating 50% of the Pt black resulting in 50% higher energy density while reducing total catalyst cost by roughly 44%.
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Schechner, Pinchas, Eugenia Bubis, Hana Faiger, Eyal Zussman, and Ehud Kroll. "Glucose Oxidation by Nano-Fibrous Anodes in a Fuel Cell." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59115.

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This work adds more experimental evidence regarding the feasibility of using glucose to fuel fuel-cells with anodes that have a high area-to-volume ratio. Electrospinning was used to fabricate sub-micrometer size fibrous electrocatalytic anode membranes for the oxidation of glucose in an alkaline fuel cell (AFC). The fibers of the membranes were made of polyacrylonitrile (PAN) and coated with silver by electroless plating. The anodes were tested while installed in a membranless fuel cell. The results presented include the open circuit voltage, OCV, the polarization curve, the power density as a function of the current density, and the peak power density, PPD. The measurements were performed with constant concentrations of glucose, 0.8 M, and KOH electrolyte solution, 1M. The performance of the anodes was found to improve as the diameter of the silver-plated fibers decreased. The highest PPD of 0.28 mW/cm2 was obtained with an anode made of plated fibers having a mean fiber diameter of 130 nanometers. We conclude from the results that saccharides in general, and glucose in particular, can serve as fuels for fuel cells, and that silver-plated polymeric electrospun electrodes have advantages due to their large surface area.
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