Anodic deposition and capacitive property of nano-WO3·H2O/MnO2 composite as supercapacitor electrode material

•Nano-WO3·H2O/MnO2 composite was prepared by a facile anodic deposition.•The preparation method can be applied to synthesize other MnO2-based composites.•The binder-free composite electrode shows excellent capacitive performance.

A binder-free composite electrode comprised of nano-WO3·H2O/MnO2 (NWMO) has been synthesized through an anodic deposition technique for supercapacitor application. The composite electrode consists of numerous NWMO nanosheets and shows a porous morphology. Electrochemical tests reveal that the as-prepared NWMO has a high specific capacitance (363 F g−1 at 0.5 A g−1) and good rate capability (210.3 F g−1 at 10 A g−1), which can be attributed to its unique structure. The capacitance retention still remains 93.8% after 5000 cycles at a relatively high current density of 2 A g−1. These results indicate that NWMO may have great potential as supercapacitor electrode material.

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