Synthesis of Oxygen‐Deficient WO3−x Nanoplates and Hollow Microspheres Decorated on a Carbon Cloth for Supercapacitors

Abstract

AbstractOxygen‐deficient CC−WO3−x nanoplates and hollow microspheres on carbon fabrics cloth were synthesized utilizing a simple solvent‐thermal route. The obtained CC−WO3−x possess an improved electronic conductivity because of the oxygen‐deficient effect and a higher specific surface area due to the unique nano‐structural features. The CC−WO3−x exhibits a high capacitance of 804 F g−1, excellent rate performance (>80 %) while the current density is enhanced five‐fold and superior cycling stability by retaining 109.5 % after 14000 cycles at 30 mV s−1. In addition, an asymmetric electrochemical capacitor (ASC) reveals a competitive energy storage performance (50.7 W h kg−1 at 1.3 KW kg−1). The reasons for its good electrochemical property are that the novel hybrid nanoplates and hollow microspheres structure with oxygen‐deficient and binder‐free, which is conducive to exposing more electroactive sites and enhancing electrical conductivity, therefore accelerating ion diffusion, facilitating charge transportation, and promoting the capacitive contribution for rapid charge‐discharge kinetics synchronously.The route is anticipated to reveal a new way to prepare hybrid nanostructure with oxygen‐deficient and binder‐free metal oxide‐based electrode material.