期刊
NANO ENERGY
卷 39, 期 -, 页码 77-85出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.06.029
关键词
Nickel-iron nitrides; Arginine; Hierarchically mesoporous structure; Oxygen electrocatalyst; Zn-air battery
类别
资金
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Science Engineering [DE-SC0005397]
- National Natural Science Foundation of China [21376122, 21273116]
Rechargeable Zn-air battery is largely limited by the lack of low-cost and highly efficient bifunctional oxygen catalysts for both oxygen evolution and reduction reactions (OER and ORR). Herein, we report a promising bifunctional electrocatalyst, mesoporous nickel-iron nitride (Ni3FeN), which was synthesized by thermal ammonalysis of hierarchal NiFe layered double hydroxide microspheres. Different from the widely studied carbon/oxide composite catalysts, this metallic nitride does not need carbon as a conducting support, thus avoiding the issue of carbon corrosion at high potentials. The catalysts provide outstanding bifunctional performance with a low overpotential (0.355 V) at 10 mA cm(-2), a low Tafel slope (70 mV dec(-1)) for OER, and a positive half-wave potential (0.78 V) for ORR under alkaline solution. More importantly, it delivers a lower voltage gap between charge and discharge and a better stability over 300 cycles compared to that of the more costly RuO2 air-cathode.
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