期刊
ADVANCED MATERIALS
卷 30, 期 46, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201804653
关键词
electrocatalysis; nanosheets; oxygen reduction reaction; transitional metal oxide; zinc-air batteries
类别
资金
- National Science Fund for Excellent Young Scholars [51722103]
- Natural Science Foundation of China [51571149, 21576202]
- National Natural Science Foundation of China [U1601216]
- National Natural Science Foundation of Guangdong Province [U1601216]
- Australian Research Council (ARC) [FL170100154, DP170104464, DP160104866]
Zinc-air batteries offer a possible solution for large-scale energy storage due to their superhigh theoretical energy density, reliable safety, low cost, and long durability. However, their widespread application is hindered by low power density. Herein, a multiscale structural engineering of Ni-doped CoO nanosheets (NSs) for zinc-air batteries with superior high power density/energy density and durability is reported for the first time. In micro- and nanoscale, robust 2D architecture together with numerous nanopores inside the nanosheets provides an advantageous micro/nanostructured surface for O-2 diffusion and a high electrocatalytic active surface area. In atomic scale, Ni doping significantly enhances the intrinsic oxygen reduction reaction activity per active site. As a result of controlled multiscale structure, the primary zinc-air battery with engineered Ni-doped CoO NSs electrode shows excellent performance with a record-high discharge peak power density of 377 mW cm(-2), and works stable for >400 h at 5mA cm(-2). Rechargeable zinc-air battery based on Ni-doped CoO NSs affords an unprecedented small charge-discharge voltage of 0.63V, outperforming state-of-the-art Pt/C catalyst-based device. Moreover, it is shown that Ni-doped CoO NSs assembled into all-solid-state coin cells can power 17 light-emitting diodes and charge an iPhone 7 mobile phone.
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