Soft- to network hard-material for constructing both ion- and electron-conductive hierarchical porous structure to significantly boost energy density of a supercapacitor

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• 作者：Pingping Yang^a ; ^b ; ^c ; ¹ ; Jiale Xie^a ; ^b ; ^c ; ^d ; ¹ ; Chunxian Guo^a ; ^b ; ^c ; Chang Ming Li^a ; ^b ; ^c ; ^{ecmli@swu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Supercapacitor ; PEDOT ; Ion transport ; Electron conductivity ; Soft-hard network ; Hierarchical porous structure
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：485
• 期：Complete
• 页码：137-143
• 全文大小：2866 K

文摘

Soft-material PEDOT is used to network hard Co₃O₄ nanowires for constructing both ion- and electron-conductive hierarchical porous structure Co₃O₄/PEDOT to greatly boost the capacitor energy density than sum of that of plain Co₃O₄ nanowires and PEDOT film. Specifically, the networked hierarchical porous structure of Co₃O₄/PEDOT is synthesized and tailored through hydrothermal method and post-electrochemical polymerization method for the PEDOT coating onto Co₃O₄ nanowires. Typically, Co₃O₄/PEDOT supercapacitor gets a highest areal capacitance of 160 mF cm⁻² at a current density of 0.2 mA cm⁻², which is about 2.2 times larger than the sum of that of plain Co₃O₄ NWs (0.92 mF cm⁻²) and PEDOT film (69.88 mF cm⁻²). Besides, if only PEDOT as active mass is counted, Co₃O₄/PEDOT cell can achieve a highest capacitance of 567.21 F g⁻¹, this is the highest capacitance value obtained by PEDOT-based supercapacitors. Furthermore, this soft-hard network porous structure also achieves a high cycling stability of 93% capacitance retention after the 20,000th cycle. This work demonstrates a new approach to constructing both ion and electron conductive hierarchical porous structure to significantly boost energy density of a supercapacitor.