One-Pot Hydrothermal Synthesis of Hexagonal WO₃ Nanorods/Graphene Composites as High-Performance Electrodes for...

Tungsten oxide (WO₃ ) as an electrode material for supercapacitors has always suffered from low capacitance and poor rate capability. In this work, a series of WO₃ nanorods/graphene composites with different weight ratios of tungsten oxide nanorods (WO₃ NRs) and reduced graphene oxide (rGO) are synthesized successfully through a facile one-pot electrostatic adsorptive hydrothermal method. In these composites, rGO enhances the conductivity, transporting electrons and protons to the WO₃ NRs. In addition, rGO can reinforce the structure of the WO₃ NRs during frequently occurring redox reactions. At a graphene weight ratio of 1 wt %, the specific capacitance of the WO₃ NRs/rGO composite is 343 F g^-1 at a current density of 0.2 A g^-1 . Compared with pure WO₃ as electrodes, the WO₃ NRs/rGO composite shows excellent specific capacity, and superior rate performance and cycling stability owing to the combined action of the double layer and pseudocapacitor. This study provides a new convenient approach to promote the electrochemical performance of tungsten oxide.