期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 36, 页码 30662-30669出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b08533
关键词
oxygen reduction and evolution reactions; electrocatalysts; Co3O4 nanoparticles; nitrogen-doped hierarchically porous carbon; cattle bone
资金
- National Natural Science Funds of China [51432003, 51502013]
Developing high-performance bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of vital importance in energy storage and conversion systems. Herein, we demonstrate a facile hydrothermal synthesis of highly dispersed Co3O4 nanoparticles (NPs) anchored on cattle-bone-derived nitrogen-doped hierarchically porous carbon (NHPC) networks as an efficient ORR/OER bifunctional electrocatalyst. The as prepared Co3O4/NHPC exhibits a remarkable catalytic activity toward both ORR (outperforming the commercial Pt/C) and OER (comparable with the commercial RuO2 catalyst) in alkaline electrolyte. The superior bifunctional catalytic activity can be ascribed to the large specific surface area (1070 m(2) g(-1)), the well-defined hierarchically porous structure, and the high content of nitrogen doping (4.93 wt %), which synergistically contribute to the homogeneous dispersion of Co3O4 NPs and the enhanced mass transport capability. Moreover, the primary Zn air battery using the Co3O4/NHPC cathode demonstrates a superior performance with an open-circuit potential of 1.39 V, a specific capacity of 795 mA h g(zn)(-1) (at 2 mA cm(-2)), and a peak power density of 80 mW cm(-2). This work delivers a new insight into the design and synthesis of high-performance bifunctional nonprecious metal electrocatalysts for Zn air battery and other electrochemical devices.
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