Three-Dimensional NiCo2O4@Polypyrrole Coaxial Nanowire Arrays on Carbon Textiles for High-Performance Flexible Asymmetric Solid-State Supercapacitor

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• 作者：Dezhi Kong ; Weina Ren ; Chuanwei Cheng ; Ye Wang ; Zhixiang Huang ; Hui Ying Yang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 30, 2015
• 年：2015
• 卷：7
• 期：38
• 页码：21334-21346
• 全文大小：1128K
• ISSN：1944-8252

文摘

In this article, we report a novel electrode of NiCo₂O₄ nanowire arrays (NWAs) on carbon textiles with a polypyrrole (PPy) nanosphere shell layer to enhance the pseudocapacitive performance. The merits of highly conductive PPy and short ion transport channels in ordered NiCo₂O₄ mesoporous nanowire arrays together with the synergistic effect between NiCo₂O₄ and PPy result in a high specific capacitance of 2244 F g^鈥?, excellent rate capability, and cycling stability in NiCo₂O₄/PPy electrode. Moreover, a lightweight and flexible asymmetric supercapacitor (ASC) device is successfully assembled using the hybrid NiCo₂O₄@PPy NWAs and activated carbon (AC) as electrodes, achieving high energy density (58.8 W h kg^鈥? at 365 W kg^鈥?), outstanding power density (10.2 kW kg^鈥? at 28.4 W h kg^鈥?) and excellent cycling stability (鈭?9.2% retention after 5000 cycles), as well as high flexibility. The three-dimensional coaxial architecture design opens up new opportunities to fabricate a high-performance flexible supercapacitor for future portable and wearable electronic devices.