A novel WO <sub>3</sub> /graphene composite using poly(ionic liquid) as a linker for enhanced supercapacitive performance
Chang Peng, Yuhongnan Yang, Chuang Li, Yuxiang Lin, Ruolan Zheng, Zeyuan Kuai, Shu Chen, Ruilian Li, Ling Li
Abstract
Abstract WO 3 has attracted widespread attention as an important semiconductor for supercapacitors. However, applications of WO 3 are limited by its poor performance regarding capacitance and conductivity. In this paper, a novel method is presented for preparing a WO 3 /reduced graphene oxide (RGO) composite, based on poly(ionic liquid) (PIL) as a linker. PIL enables a tight contact between WO 3 and graphene to exploit the excellent electrical conductivity of graphene. Results of the morphology for the as-prepared WO 3 /PIL/RGO composite indicate that the WO 3 nanoparticles are distributed uniformly on the surface of the RGO. The WO 3 /PIL/RGO electrode displays a much higher specific capacitance, 316 F g −1 at 1 A g −1 , than that of the pure WO 3 electrode. Furthermore, WO 3 /PIL/RGO also has good rate and long cycling performance for supercapacitors, making it a promising electrode material.