期刊
ADVANCED MATERIALS
卷 29, 期 44, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201704117
关键词
bifunctional electrocatalysts; flexible Zn-air batteries; hollow Co3O4 nanospheres; Kirkendall effect; metal-organic frameworks
类别
资金
- Ministry of Education (Singapore) [MOE2015-T2-2-094]
- 973 Program [2013CB632701]
- National Natural Science Foundation of China [51202163, 51772213]
- Advanced Energy Storage Research Programme [IMRE/12-2P0503, IMRE/12-2P0504]
- Institute of Materials Research and Engineering of the A*STAR, Singapore
Highly active and durable air cathodes to catalyze both the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are urgently required for rechargeable metal-air batteries. In this work, an efficient bifunctional oxygen catalyst comprising hollow Co3O4 nanospheres embedded in nitrogen-doped carbon nanowall arrays on flexible carbon cloth (NC-Co3O4/CC) is reported. The hierarchical structure is facilely derived from a metal-organic framework precursor. A carbon onion coating constrains the Kirkendall effect to promote the conversion of the Co nanoparticles into irregular hollow oxide nanospheres with a fine scale nanograin structure, which enables promising catalytic properties toward both OER and ORR. The integrated NC-Co3O4/CC can be used as an additive-free air cathode for flexible all-solid-state zinc-air batteries, which present high open circuit potential (1.44 V), high capacity (387.2 mAh g(-1), based on the total mass of Zn and catalysts), excellent cycling stability and mechanical flexibility, significantly outperforming Pt- and Ir-based zinc-air batteries.
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