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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202001651
|2 doi
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|a pubmed24n1047.xml
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|a (DE-627)NLM314178767
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|a (NLM)32844534
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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 Yin, Jie
|e verfasserin
|4 aut
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|a NiCo2 O4 -Based Nanosheets with Uniform 4 nm Mesopores for Excellent Zn-Air Battery Performance
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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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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 07.12.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2020 Wiley-VCH GmbH.
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|a Herein, a strategy is reported for the fabrication of NiCo2 O4 -based mesoporous nanosheets (PNSs) with tunable cobalt valence states and oxygen vacancies. The optimized NiCo2.148 O4 PNSs with an average Co valence state of 2.3 and uniform 4 nm nanopores present excellent catalytic performance with an ultralow overpotential of 190 mV at a current density of 10 mA cm-2 and long-term stability (700 h) for the oxygen evolution reaction (OER) in alkaline media. Furthermore, Zn-air batteries built using the NiCo2.148 O4 PNSs present a high power and energy density of 83 mW cm-2 and 910 Wh kg-1 , respectively. Moreover, a portable battery box with NiCo2.148 O4 PNSs as the air cathode presents long-term stability for 120 h under low temperatures in the range of 0 to -35 °C. Density functional theory calculations reveal that the prominent electron exchange and transfer activity of the electrocatalyst is attributed to the surface lower-coordinated Co-sites in the porous region presenting a merging 3d-eg -t2g band, which overlaps with the Fermi level of the Zn-air battery system. This favors the adsorption of the *OH, and stabilized *O radicals are reached, toward competitively lower overpotential, demonstrating a generalized key for optimally boosting overall OER performance
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|a Journal Article
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|a Zn-air batteries
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|a mesoporous nanosheets
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|a oxygen evolution reaction
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|a oxygen vacancies
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|a valence electron regulation
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|a Jin, Jing
|e verfasserin
|4 aut
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| 700 |
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|a Liu, Hongbo
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Huang, Bolong
|e verfasserin
|4 aut
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1 |
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|a Lu, Min
|e verfasserin
|4 aut
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1 |
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|a Li, Jianyi
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Liu, Hanwen
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Zhang, Hong
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Peng, Yong
|e verfasserin
|4 aut
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|a Xi, Pinxian
|e verfasserin
|4 aut
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| 700 |
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|a Yan, Chun-Hua
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 32(2020), 39 vom: 01. Okt., Seite e2001651
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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| 773 |
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|g volume:32
|g year:2020
|g number:39
|g day:01
|g month:10
|g pages:e2001651
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|u http://dx.doi.org/10.1002/adma.202001651
|3 Volltext
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