Biosorption-Directed Integration of Hierarchical CoO/C Composite with Nickel Foam for High-performance Supercapacitor

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• 作者：Ning Zhang^a ; ¹ ; Xiaohui Yan^a ; ¹ ; Jia Li^a ; Jianmin Ma^b ; ^{nanoelechem@hnu.edu.cn} ; Dickon H.L. Ng^a ; ^{dng@phy.cuhk.edu.hk}
• 关键词：Biosorption ; Cobalt monoxide ; Supercapacitor ; Electrochemical properties
• 刊名：Electrochimica Acta
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：226
• 期：Complete
• 页码：132-139
• 全文大小：2170 K
• 卷排序：226

文摘

Attributed to the low cost, chemical stability and high theoretical specific capacitance, cobalt monoxide (CoO) is a superior material for electrodes in supercapacitor. Here, we propose the nickel foam supported Chlorella-inspired CoO/C hierarchical structure for the making of a binder-free electrode for supercapacitor application. The fabrication process takes advantage of the Chlorella's biosorption. The fabricated structure shows excellent electrochemical properties with a specific capacitance of 648 F/g (at current density of 0.5 A/g), and good cycling stability (no diminution over ∼8000 cycles at the current density of 3 A/g). The asymmetric supercapacitor device is assembled by employing CoO/C composite as the positive electrode and activated carbon as the negative electrode. Such device delivers a high energy density of 30.9 Wh/kg at 398 W/kg, and a maximum power density of 8000 W/kg. This work demonstrates a low-cost bio-inspired method of producing CoO/C composite, which can be used as an active electrode for electrochemical supercapacitors.