Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 250, Issue -, Pages 71-77Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2019.03.021
Keywords
Porous Co-NiO NFs; Bifunctional electrocatalysts; Zinc-air battery
Funding
- National Natural Science Foundation of China [11474137, 11674143]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT 16R35]
- Fundamental Research Funds for the Central Universities [LZUMMM2018017, lzujbky-2018-121]
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Zinc-air batteries (ZnABs) represent one of the most promising options to power next-generation electric vehicles owing to their high theoretical energy density and reliable safety. However, their further development and application is hampered due to the lack of high-efficiency bifunctional air electrocatalysts. Herein, porous Co-doped NiO nanoflowers (Co-NiO NFs) with outstanding electrocatalytic activity and stability toward oxygen evolution reaction (ORR) and oxygen reduction reaction (OER) is reported for the first time, including a positive half-wave potential (0.79 V) for ORR and a small overpotential (1.53V at 10 mA cm(-2)) for OER. Firstly, the synergistic effect between the sound two-dimensional (2D) hexagonal framework and numerous nanopores inside the nanosheets offers an available surface for O-2 adsorption/diffusion, and a large effective electrochemical active surface area for exploring and utilizing more active sites. Secondly, Co dopants can effectively increase the conductivity of pristine NiO nanoflowers (NFs) and simultaneously enhances the intrinsic ORR and OER activity. Notably, the liquid ZnABs with engineered Co-NiO NFs electrode exhibits a high discharge peak power density of 93 mW cm(-2), a satisfactory specific capacity of 830 mA h g(-1) at the current density of 5 mA cm(-2), together with excellent cycling stability of 110 h at 2 mA cm(-2). Additionally, the corresponding all-solid-state ZnABs assembled with Co-NiO NFs shows a long durability with the stable charge-discharge cycles of 6h and good flexible nature.
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