期刊
SMALL
卷 12, 期 19, 页码 2580-2587出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201503694
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资金
- Advanced Energy Storage Research Programme - Science and Engineering Research Council (SERC) of AstarSTAR (Agency for Science, Technology and Research), Singapore [IMRE/12-2P0504, 1229904044]
- MOE under AcRF [ARC 26/13, MOE2013-T2-1-034, ARC 19/15, MOE2014-T2-2-093, RGT18/13, RG5/13]
- NTU under Start-Up Grant in Singapore [M4081296.070.500000]
- National Research Foundation, Prime Minister's Office, Singapore
Durable electrocatalysts with high catalytic activity toward oxygen reduction reaction (ORR) are crucial to high-performance primary zinc-air batteries (ZnABs) and direct methanol fuel cells (DMFCs). An efficient composite electrocatalyst, Co@Co3O4 core@shell nanoparticles (NPs) embedded in pyrolyzed polydopamine (PPD) is reported, i.e., in Co@Co3O4@PPD core@bishell structure, obtained via a three-step sequential process involving hydrothermal synthesis, high temperature calcination under nitrogen atmosphere, and gentle heating in air With Co@Co3O4 NPs encapsulated by ultrathin highly graphitized N-doped carbon, the catalyst exhibits excellent stability in aqueous alkaline solution over extended period and good tolerance to methanol crossover effect. The integration of N-doped graphitic carbon outer shell and ultrathin nanocrystalline Co3O4 inner shell enable high ORR activity of the core@bishell NPs, as evidenced by ZnABs using catalyst of Co@Co3O4@PPD in air-cathode which delivers a stable voltage profile over 40 h at a discharge current density of as high as 20 mA. cm(-2).
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