A structured CoWO4 synthesized by microwave-assisted hydrothermal process as electrode for hybrid supercapacitor

A structured carambola-like CoWO4 was fast prepared by a microwave-assisted hydrothermal method with the help of urea and NH4F. Physical characterization indicated that the as-obtained CoWO4 displayed a large specific surface area, high dispersion and self-selected orientation of crystal growth. Further electrochemical tests presented a high specific capacity of 492.0 C.g(-1) at 1 A.g(-1), low internal resistance and excellent cycle stability as 137.3% capacity maintenance after 8000 cycles at 20 A.g(-1). These excellent electrochemical properties for the as-obtained material indicate that CoWO4 has great potential as hybrid supercapacitor electrode materials. This work also provides a new and effective solution for regulating the morphology of CoWO4-based hybrid supercapacitor materials to further improve the electrochemical performance.