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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1002/adma.201907168
|2 doi
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|a pubmed25n1019.xml
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|a (DE-627)NLM305948296
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|a (NLM)31999016
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Mu, Chuan
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Rational Design of Spinel Cobalt Vanadate Oxide Co2 VO4 for Superior Electrocatalysis
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|c 2020
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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| 520 |
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|a © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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|a 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 ( t 2 g 6 e g 1 ) , 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
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|a Journal Article
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|a fuel cells
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| 650 |
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|a oxygen reduction
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| 650 |
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4 |
|a spinel cobalt vanadate oxide
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1 |
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|a Mao, Jing
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Guo, Jiaxin
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Guo, Qianjin
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Li, Zhiqing
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Qin, Wenjing
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Hu, Zhenpeng
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Davey, Kenneth
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Ling, Tao
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Qiao, Shi-Zhang
|e verfasserin
|4 aut
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| 773 |
0 |
8 |
|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 32(2020), 10 vom: 16. März, Seite e1907168
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnas
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| 773 |
1 |
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|g volume:32
|g year:2020
|g number:10
|g day:16
|g month:03
|g pages:e1907168
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|u http://dx.doi.org/10.1002/adma.201907168
|3 Volltext
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