Chen Xiaojuan, Yang Longkun, Huang Yunxia, Ge Shuaipeng, Zhang Hao, Cui Yimin, Huang Anping, Xiao Zhisong
Key Laboratory of Micro-nano Measurement, Manipulation and Physics, School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191, P.R. China.
Beijing Academy of Quantum Information Sciences, Beijing, 100193, P.R. China.
Chemistry. 2020 Jan 22;26(5):1111-1116. doi: 10.1002/chem.201904324. Epub 2020 Jan 9.
Developing high-efficiency, cost-effective, and durable electrodes is significant for electrochemical capacitors and electrocatalysis. Herein, a 3D bifunctional electrode consisting of nickel hydroxide nanosheets@nickel sulfide nanocubes arrays on Ni foam (Ni(OH) @Ni S /NF) obtained from a Prussian blue analogue-based precursor is reported. The 3D higher-order porous structure and synergistic effect of different compositions endow the electrode with large specific surface area, facile ion/electron transport path, and improved conductivity. As a result, the Ni(OH) @Ni S /NF electrode exhibits a high specific capacity of 211 mA h g at a current density of 1 A g and 73 % capacity retention after 5000 cycles at 5 A g . Moreover, the Ni(OH) @Ni S /NF electrode has superior electrocatalytic activity for the hydrogen evolution reaction with low overpotentials of 140 and 210 mV at current densities of 10 and 100 mA cm , respectively. The synthetic strategy for the unique higher-order porous structure can be extended to fabricate other composite materials for energy storage and conversion.
开发高效、经济高效且耐用的电极对于电化学电容器和电催化具有重要意义。在此，报道了一种由泡沫镍上的氢氧化镍纳米片@硫化镍纳米立方体阵列组成的三维双功能电极（Ni(OH)@NiS/NF），该电极由基于普鲁士蓝类似物的前驱体制备而成。三维高阶多孔结构和不同成分的协同效应赋予该电极较大的比表面积、便捷的离子/电子传输路径以及改善的导电性。结果，Ni(OH)@NiS/NF电极在1 A g的电流密度下表现出211 mA h g的高比容量，在5 A g下经过5000次循环后容量保持率为73%。此外，Ni(OH)@NiS/NF电极对析氢反应具有优异的电催化活性，在10和100 mA cm的电流密度下过电位分别为140和210 mV。这种独特的高阶多孔结构的合成策略可扩展用于制备其他用于能量存储和转换的复合材料。
