Kim Sung-Wook, Kim Ik-Hee, Kim Sun-I, Jang Ji-Hyun
School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea.
Chem Asian J. 2017 Jun 19;12(12):1291-1296. doi: 10.1002/asia.201700454. Epub 2017 May 18.
A straightforward way to attain the theoretical capacitance and high rate capability of nickel hydroxide supercapacitors, by utilizing a mesoporous hollow dendritic three-dimensional-nickel (3D-Ni) current collector is proposed. A facile electrodeposition method employing a hydrogen bubble template was chosen for rapid fabrication of the dendritic 3D-nickel structure. After nickel hydroxide was deposited on the hollow 3D-nickel current collector, it exhibited a highest capacitance of 3637 F g at a current density of 1 A g , and retained 97 % of capacitance at a high current density of 100 A g with a cycle stability of over 80 % after 10 000 cycles. The enhanced performance could be attributed to the large surface area and high conductivity of the moss-like dendritic 3D-Ni current collector, which allowed direct contact between the active materials and the current collector, and reduced diffusion resistance between the surface of the active materials and the electrolyte. These results not only confirmed a facile fabrication method for high-performance 3D metal nanostructures, but also offer a promising solution for state-of-the-art energy storage systems.
提出了一种通过使用介孔空心树枝状三维镍（3D-Ni）集流体来实现氢氧化镍超级电容器理论电容和高倍率性能的直接方法。选择了一种采用氢气泡模板的简便电沉积方法来快速制备树枝状3D镍结构。在将氢氧化镍沉积在空心3D镍集流体上后，在电流密度为1 A g时，其表现出3637 F g的最高电容，在100 A g的高电流密度下保留了97%的电容，在10000次循环后循环稳定性超过80%。性能的提高可归因于苔藓状树枝状3D-Ni集流体的大表面积和高导电性，这使得活性材料与集流体之间能够直接接触，并降低了活性材料表面与电解质之间的扩散电阻。这些结果不仅证实了一种用于高性能3D金属纳米结构的简便制造方法，而且为先进的储能系统提供了一种有前景的解决方案。
