Tian Jinjun, Xue Yan, Yu Xinping, Pei Yuanchao, Zhang Hucheng, Wang Jianji
Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University Xinxiang Henan 453007 China
School of Biological and Chemical Engineering, Nanyang Institute of Technology Nanyang Henan 473004 China.
RSC Adv. 2018 Dec 13;8(73):41740-41748. doi: 10.1039/c8ra09128e. eCollection 2018 Dec 12.
This study proposes a facile solvothermal synthesis of nickel tungstate (NiWO) nanowires for application as a novel cathode material for supercapacitors. The structure, morphology, surface area and pore distribution were characterized and their capacitive performances were investigated. The results showed that the NiWO nanowires synthesized in ethylene glycol solvent could offer a high specific capacitance of 1190 F g at a current density of 0.5 A g and a capacitance retaining ratio of 61.5% within 0.5-10 A g. When used as a cathodic electrode of an asymmetric supercapacitor (ASC), the NiWO nanowire based device can be cycled reversibly in a high-voltage region of 0-1.7 V with a high specific capacitance of 160 F g at 0.5 A g, which therefore contributed to an energy density of 64.2 W h kg at a power density of 425 W kg. Moreover, 92.8% of its initial specific capacitance can be maintained after 5000 consecutive cycles (5 A g). These excellent capacitive properties make NiWO a credible electrode material for high-performance supercapacitors.
本研究提出了一种简便的溶剂热法合成钨酸镍（NiWO）纳米线，用作超级电容器的新型阴极材料。对其结构、形态、表面积和孔隙分布进行了表征，并研究了它们的电容性能。结果表明，在乙二醇溶剂中合成的NiWO纳米线在电流密度为0.5 A g时可提供1190 F g的高比电容，在0.5 - 10 A g范围内电容保持率为61.5%。当用作不对称超级电容器（ASC）的阴极电极时，基于NiWO纳米线的器件可在0 - 1.7 V的高电压区域内可逆循环，在0.5 A g时具有160 F g的高比电容，因此在功率密度为425 W kg时能量密度为64.2 W h kg。此外，在连续5000次循环（5 A g）后，其初始比电容的92.8%得以保持。这些优异的电容性能使NiWO成为高性能超级电容器的可靠电极材料。
