School of Electrical Engineering, Pusan National University, Gumjeong-Ku, Jangjeong-Dong, Busan 46241, South Korea.
Dalton Trans. 2018 Jul 10;47(27):9057-9063. doi: 10.1039/c8dt01245h.
In this study, we report a facile two-step fabrication of honeycomb-like NiMoO4@NiWO4 nanocomposites on Ni foam as the electrode for high-performance supercapacitor applications. Structural characterization and compositional analysis of the as-prepared NiMoO4@NiWO4 nanocomposites was performed using scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, cyclic voltammetry, galvanostatic charge-discharge cycling, and electrochemical impedance spectroscopy. The electrochemical properties of the as-synthesized NiMoO4@NiWO4 nanocomposites were studied in a 3 M KOH electrolyte solution for application as electrode material of supercapacitors. A maximum specific capacitance of 1290 F g-1 was achieved for NiMoO4@NiWO4 at a current density of 2 A g-1. This electrode exhibits excellent long cycle-life stability with 93.1% specific capacitance retention after 3000 cycles at a current density of 6 A g-1. Our studies indicate that the as-synthesized NiMoO4@NiWO4 nanocomposites could be a promising candidate as the electrode material in high-performance electrochemical energy storage applications.
在这项研究中，我们报告了一种简便的两步法制备蜂窝状 NiMoO4@NiWO4 纳米复合材料，该复合材料负载在泡沫镍上，可用作高性能超级电容器的电极。采用扫描电子显微镜、能谱分析、透射电子显微镜、X 射线衍射、X 射线光电子能谱、循环伏安法、恒流充放电循环和电化学阻抗谱对所制备的 NiMoO4@NiWO4 纳米复合材料进行了结构表征和组成分析。在 3 M KOH 电解质溶液中研究了合成的 NiMoO4@NiWO4 纳米复合材料作为超级电容器电极材料的电化学性能。在 2 A g-1 的电流密度下，NiMoO4@NiWO4 的最大比电容为 1290 F g-1。该电极在 6 A g-1 的电流密度下经过 3000 次循环后，具有 93.1%的比电容保持率，表现出优异的长循环寿命稳定性。我们的研究表明，所合成的 NiMoO4@NiWO4 纳米复合材料有望成为高性能电化学储能应用中电极材料的候选材料。
