3D architecture of a graphene/CoMoO₄ composite for asymmetric supercapacitors usable at various temperatures

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• 作者：Yaru Jiang^a ; Xin Zheng^a ; Xiaoqin Yan^a ; ^{xqyan@mater.ustb.edu.cn} ; Yong Li^a ; Xuan Zhao^a ; Yue Zhang^a ; ^b ; ^{yuezhang@ustb.edu.cn}
• 关键词：3D-graphene ; High specific capacitance ; Asymmetric supercapacitor ; Various temperatures
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 May 2017
• 年：2017
• 卷：493
• 期：Complete
• 页码：42-50
• 全文大小：2382 K
• 卷排序：493

文摘

Designing and optimizing the electrode materials and studying the electrochemical performance or cycle life of the supercapacitor under different working conditions are crucial to its practical application. Herein, we proposed a rational design of 3D-graphene/CoMoO4 nanoplates by a facile two-step hydrothermal method. Owing to the high electron transfer rate of graphene and the high activity of the CoMoO4 nanoplates, the three-dimensional electrode architectures achieved remarkable electrochemical performances with high areal specific capacitance (1255.24 F/g at 1 A/g) and superior cycling stability (91.3% of the original specific capacitance after 3000 cycles at 1 A/g). The all-solid-state asymmetric supercapacitor composed of 3D-graphene/CoMoO4 and activated carbon (AC) exhibited a specific capacitance of 109 F/g at 0.2 A/g and an excellent cycling stability with only 12.1% of the initial specific capacitance off after 3000 cycles at 2 A/g. The effects of temperature and charge-discharge current densities on the charge storage capacity of the supercapacitor were also investigated in detail for practical applications.