High-performance flexible asymmetric supercapacitor based on rGO anode and WO <sub>3</sub> /WS <sub>2</sub> core/shell nanowire cathode
Kowsik Sambath Kumar, Nitin Choudhary, Deepak Pandey, Luis Hurtado, Hee‐Suk Chung, Laurène Tétard, Yeonwoong Jung, Jayan Thomas
Abstract
Abstract Flexible smart electronics require their energy storage device to be flexible in nature. Developing high-performance flexible energy storage devices require direct integration of electrode active materials on current collectors to satisfy the high electronic/ionic conductivity and long-term durability requirements. Herein, we develop a flexible all-solid-state asymmetric supercapacitor comprised of reduced graphene oxide (rGO) and core/shell tungsten trioxide/tungsten disulfide (WO 3 /WS 2 ) nanowire based electrodes. The electrodes synthesized via electrochemical deposition and chemical vapor deposition avoided the necessity to use non-conductive binders and offered excellent cyclic stability. The structural integrity provided by the rGO and WO 3 /WS 2 electrodes facilitated excellent electrochemical stability with capacitance retention of 90% and 100% after 10 000 charge-discharge cycles, respectively. An all-solid-state device provides a voltage window of 1.5 V and more than 70% capacitance retention after 10 000 charge-discharge cycles. Providing 97% capacitance retention upon mechanical bending reveals its potential to be used as an energy storage devices in flexible electronics.