Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 38, Issue -, Pages 34-40Publisher
ELSEVIER
DOI: 10.1016/j.jechem.2019.01.001
Keywords
Electrocatalyst; Zn-air batteries; Oxygen evolution reaction; Oxygen reduction reaction
Funding
- National Natural Science Foundation of China [11474137]
- Fundamental Research Funds for the Central Universities [LZUMMM2018017, lzujbky-2018-121]
- Key Research and Development Plan of Gansu Province [18YF1GA088]
- Scientific research project of colleges and universities in gansu province [2018A-205]
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A Zn-air battery is a potential next-generation energy storage device owing to its extremely high theoretical energy density. Currently, it is important to explore non-precious metal electrocatalysts with high electroactivity and stability in the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) for the development of Zn-air batteries. In this work, porous (Ni,Co)Se-2 nanosheets were synthesized by selenizing NiCo2O4 nanosheets. By regulating the conductivity and morphology of the sample, the prepared porous (Ni,Co)Se-2 nanosheets show enhanced electrocatalytic activity for OER and ORR compared to NiCo2O4 nanosheets. The aqueous Zn-air battery using porous (Ni,Co)Se 2 nanosheets as the air cathode exhibits superior charge and discharge performance (1.98 V for charging and 1.17 V for discharging), high specific capacity (770 mAh/g), and excellent cycle stability (140 h). These results indicate that the porous (Ni,Co)Se-2 nanosheets are suitable as a bifunctional electrocatalyst for future Zn-air batteries. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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