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https://hdl.handle.net/2440/124201
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Type: | Journal article |
Title: | Rational design of spinel cobalt vanadate oxide Co₂VO₄ for superior electrocatalysis |
Other Titles: | Rational design of spinel cobalt vanadate oxide Co(2)VO(4) for superior electrocatalysis |
Author: | Mu, C. Mao, J. Guo, J. Guo, Q. Li, Z. Qin, W. Hu, Z. Davey, K. Ling, T. Qiao, S.Z. |
Citation: | Advanced Materials, 2020; 32(10):e1907168-1-e1907168-8 |
Publisher: | Wiley |
Issue Date: | 2020 |
ISSN: | 0935-9648 1521-4095 |
Statement of Responsibility: | Chuan Mu, Jing Mao, Jiaxin Guo, Qianjin Guo, Zhiqing Li, Wenjing Qin, Zhenpeng Hu, Kenneth Davey, Tao Ling and Shi-Zhang Qiao |
Abstract: | Electrochemical energy devices, such as fuel cells and metal-air batteries, convert chemical energy directly into electricity without adverse environmental impact. Attractive alternatives to expensive noble metals used in these renewable energy technologies are earth-abundant transition metal oxides. However, they are often limited by catalytic and conductive capabilities. Here reported is a spinel oxide, Co2 VO4 , by marrying metallic vanadium atomic chains with electroactive cobalt cations for superior oxygen reduction reaction (ORR)-a key process for fuel cells, metal-air batteries, etc. The experimental and simulated electron energy-loss spectroscopy analyses reveal that Co2+ cations at the octahedral sites take the low spin state with one eg electron (t2g6eg1) , favoring advantageous ORR energetics. Measurement of actual electrical conductivity confirms that Co2 VO4 has several orders of magnitude increase when compared with benchmark cobalt oxides. As a result, a zinc-air battery with new spinel cobalt vanadate oxide as the ORR catalyst shows excellent performance, together with a record-high discharge peak power density of 380 mW cm-2 . Crucially, this is superior to state-of-the-art Pt/C-based device and is greatest among zinc-air batteries assembled with metal, metal oxide, and carbon catalysts. The findings present a new design strategy for highly active and conductive oxide materials for a wide range of electrocatalytic applications, including ORR, oxygen evolution, and hydrogen evolution reactions. |
Keywords: | fuel cells oxygen reduction spinel cobalt vanadate oxide |
Rights: | © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim |
DOI: | 10.1002/adma.201907168 |
Grant ID: | http://purl.org/au-research/grants/arc/FL170100154 http://purl.org/au-research/grants/arc/DP170104464 http://purl.org/au-research/grants/arc/DP160104866 |
Published version: | http://dx.doi.org/10.1002/adma.201907168 |
Appears in Collections: | Aurora harvest 8 Chemical Engineering publications |
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