Zhang Ke, Ye Xiao, Shen Yuenian, Cen Ze, Xu Kaibing, Yang Fang
College of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai, 201620, China.
Dalton Trans. 2020 Jul 7;49(25):8582-8590. doi: 10.1039/d0dt01556c. Epub 2020 Jun 16.
Interface engineering multi-component core-shell nanostructures with highly efficient and reversible faradaic reactions for energy conversion storage devices is still a challenge. Here, CoO nanowires@NiO ultrafine nanowires on Ni foam were well fabricated via coating the NiO ultrafine nanowires on porous CoO nanowire arrays. The combination of structural and compositional advantages endows the CoO@NiO core-shell composites with excellent electrochemical performance, such as a favorable specific capacity of 0.71 mA h cm at 3 mA cm, excellent rate capability and 85% retention rate up to 10,000 cycles. Rechargeable alkaline batteries with the CoO@NiO core-shell composites and AC as cathode and anode, respectively, had a high specific capacity of 0.51 mA h cm and stable cycling ability (81% retention after 5000 cycles). The hierarchical core-shell heterostructure electrode exhibits excellent electrochemical performance, making it a very promising material for next-generation energy storage device applications.
对于能量转换存储设备而言，界面工程制备具有高效且可逆法拉第反应的多组分核壳纳米结构仍然是一项挑战。在此，通过在多孔CoO纳米线阵列上包覆NiO超细纳米线，成功制备出了泡沫镍上的CoO纳米线@NiO超细纳米线。结构和成分优势的结合赋予了CoO@NiO核壳复合材料优异的电化学性能，例如在3 mA cm时具有0.71 mA h cm的良好比容量、出色的倍率性能以及高达10000次循环的85%保留率。分别以CoO@NiO核壳复合材料和活性炭作为正负极的可充电碱性电池具有0.51 mA h cm的高比容量和稳定的循环能力（5000次循环后保留率为81%）。这种分级核壳异质结构电极展现出优异的电化学性能，使其成为下一代储能设备应用中非常有前景的材料。
