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Title: An Oxygen Vacancy-rich Semiconductor Supported Bifunctional Catalyst for Efficient and Stable Zinc-Air Battery

Journal Article · · Advanced Materials

The highly oxidative operating condition of rechargeable zinc-air batteries causes significant carbon-support corrosion of bifunctional oxygen electrocatalysts. In this work, we propose a new strategy for the catalyst support design focusing on OV-rich, low-bandgap semiconductor. 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 small metal size, high catalytic activity, and high stability. The strategy is demonstrated by successfully synthesizing ultrafine Co metal decorated three-dimensionally 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 verified by density functional theory (DFT) calculations. These results shed light on using OV-rich semiconductors as a promising support to design efficient and durable non-precious electrocatalysts.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1507102
Report Number(s):
BNL--211550-2019-JAAM
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 6 Vol. 31; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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