A Hybrid Electrode of Co3O4@PPy Core/Shell Nanosheet Arrays for High-Performance Supercapacitors

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• 作者：Xiaojun Yang ; Kaibing Xu ; Rujia Zou ; Junqing Hu
• 关键词：Co3O4@PPy ; Core/shell nanosheet arrays ; Supercapacitors
• 刊名：Nano-Micro Letters
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：8
• 期：2
• 页码：143-150
• 全文大小：1,078 KB
• 刊物类别：Nanotechnology and Microengineering; Nanotechnology; Nanoscale Science and Technology;
• 刊物主题：Nanotechnology and Microengineering; Nanotechnology; Nanoscale Science and Technology;
• 出版者：Springer Berlin Heidelberg
• ISSN：2150-5551

文摘

Herein, combining solverthermal route and electrodeposition, we grew unique hybrid nanosheet arrays consisting of Co₃O₄ nanosheet as a core, PPy as a shell. Benefiting from the PPy as conducting polymer improving an electron transport rate as well as synergistic effects from such a core/shell structure, a hybrid electrode made of the Co₃O₄@PPy core/shell nanosheet arrays exhibits a large areal capacitance of 2.11 F cm−2 at the current density of 2 mA cm−2, a ~4-fold enhancement compared with the pristine Co₃O₄ electrode; furthermore, this hybrid electrode also displays good rate capability (~65 % retention of the initial capacitance from 2 to 20 mA cm−2) and superior cycling performance (~85.5 % capacitance retention after 5000 cycles). In addition, the equivalent series resistance value of the Co₃O₄@PPy hybrid electrode (0.238 Ω) is significantly lower than that of the pristine Co₃O₄ electrode (0.319 Ω). These results imply that the Co₃O₄@PPy hybrid composites have a potential for fabricating next-generation energy storage and conversion devices.