Journal
ADVANCED MATERIALS
Volume 31, Issue 6, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201806761
Keywords
bifunctional catalysts; metal-support interactions; oxygen evolution reaction; oxygen vacancies; zinc-air batteries
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Funding
- Natural Science and Engineering Research Council of Canada (NSERC)
- 111 Project [D17007]
- Henan Center for Outstanding Overseas Scientists [GZS2018003]
- U.S. Department of Energy (DOE), Office of Basic Energy Science [DE-SC0012704]
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The highly oxidative operating conditions of rechargeable zinc-air batteries causes significant carbon-support corrosion of bifunctional oxygen electrocatalysts. Here, a new strategy for the catalyst support design focusing on oxygen vacancy (OV)-rich, low-bandgap semiconductor is proposed. The OVs promote the electrical conductivity of the oxide support, and at the same time offer a strong metal-support interaction (SMSI), which enables the catalysts to have small metal size, high catalytic activity, and high stability. The strategy is demonstrated by successfully synthesizing ultrafine Co-metal-decorated 3D ordered macroporous titanium oxynitride (3DOM-Co@TiOxNy). The 3DOM-Co@TiOxNy catalyst exhibits comparable activities for oxygen reduction and evolution reactions, but much higher cycling stability than noble metals in alkaline conditions. The zinc-air battery using this catalyst delivers an excellent stability with less than 1% energy efficiency loss over 900 charge-discharge cycles at 20 mA cm(-2). The high stability is attributed to the strong SMSI between Co and 3DOM-TiOxNy which is verified by density functional theory calculations. This work sheds light on using OV-rich semiconductors as a promising support to design efficient and durable nonprecious electrocatalysts.
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