Single-step hydrothermal synthesis of WO3-MnO2 composite as an active material for all-solid-state flexible asymmetric supercapacitor. (1st February 2018)

• Record Type: Journal Article
• Authors: Shinde, Pragati A.; Lokhande, Vaibhav C.; Patil, Amar M.; Ji, Taeksoo; Lokhande, Chandrakant D.
• Is Part Of: International journal of hydrogen energy. Volume 43:Number 5(2018)
• Page Start: 2869
• Page End: 2880
• Publication Date: 2018-02-01
• Subjects: Asymmetric supercapacitors -- Composites -- Energy storage -- MnO2 -- WO3 -- WO3- MnO2; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.12.093
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: In present study, new strategy is employed to build composite nanostructure and asymmetric configuration to enhance the capacitive performance of supercapacitor device. The WO3 -MnO2 composite with mesoporous structure is prepared by single-step hydrothermal method and used to gain superior electrochemical performance in asymmetric configuration. A binder-free and additive-less WO3 -MnO2 composite electrode exhibits high specific capacitance of 609 F g −1 at a scan rate of 5 mV s −1 . The flexible asymmetric supercapacitor device with WO3 -MnO2 as a positive electrode and WO3 as a negative electrode demonstrates stable operating potential window of 1.4 V with specific capacitance of 103 F g −1 at a scan rate of 5 mV s −1 and energy density of 24.13 Wh kg −1 at power density of 915 W kg −1 . Furthermore, WO3 -MnO2 //WO3 device exhibits good cycle life with capacity retention of 95% after 2500 cycles and excellent mechanical flexibility. These results reveal the potential of WO3 -MnO2 composite electrode for fabrication of high-performance supercapacitors. Highlights: WO3 -MnO2 electrode was successfully fabricated by single-step hydrothermal method. Synergistic effect between constituent phases enhances the electrochemical performance. The asymmetric supercapacitor exhibits high energy and power density.