Straightforward synthesis of hierarchical Co₃O₄@CoWO₄/rGO core-shell arrays on Ni as hybrid electrodes for asymmetric supercapacitors

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• 作者：Xiaowei Xu^a ; Yang Yang^a ; Man Wang^a ; Pei Dong^b ; Robert Baines^b ; Jianfeng Shen^a ; ^{jfshen@fudan.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Mingxin Ye^a ; ^{mxye@fudan.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Asymmetric supercapacitor ; Co3O4@CoWO4/rGO ; Core/shell structure ; Electrode materials
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：42
• 期：9
• 页码：10719-10725
• 全文大小：3053 K

文摘

Hierarchical Co₃O₄@CoWO₄/rGO core/shell nanoneedles arrays are successfully grown on 3D nickel foam using a simple, effective method. By virtue of its unique structure, Co₃O₄@CoWO₄/rGO demonstrates an enhanced specific capacitance of 386 F g⁻¹ at 0.5 A g⁻¹ current density. It can be used as an integrated, additive-free electrode for supercapacitors that boasts excellent performance. As illustration, we assemble an asymmetric supercapacitor (ASC) using the as-prepared Co₃O₄@CoWO₄/rGO as the positive electrode and activated carbon as the negative electrode. The optimized ASC displays a maximum energy density of 19.99 Wh kg⁻¹ at a power density of 321 W kg⁻¹. Furthermore, the ASC also presents a remarkably long cycle life along with 88.8% specific capacitance retention after 5000 cycles.