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Applied Surface Science, Vol.460, 84-91, 2018
Polypyrrole/titania-coated cotton fabrics for flexible supercapacitor electrodes
Flexible and wearable supercapacitors are mostly desired with the fast development of wearable electronics in recent years. Herein, polypyrrole (PPy)/titania (TiO2)-coated cotton fabrics as flexible supercapacitor electrodes were prepared using both the sol-gel approach and the in situ oxidative polymerization. The maximum electrical conductivity of the composite fabrics is 6.3 S cm(-1), implying that these fabrics could be directly used as electrodes. The obtained quasi-rectangular shaped cyclic voltammetry (CV) curves indicate good capacitive behavior of the composite fabrics. The GCD results demonstrate that the fabric electrodes show a significantly improved specific capacitance of 733 Fg(-1) with a high energy density of 44.4 Wh kg(-1) at a current density of 0.6A cm(-2) as compared with the value of 366Fg(-1) without TiO2. Corresponding slow decrease in specific capacitance with the increased current density indicates superior rate capability. These excellent electrochemical properties of the PPy/TiO2-coated fabrics extend their potential applications in various self-powered wearable electronics. (C) 2017 Elsevier B.V. All rights reserved.