| Summary: | A facile UV-photolysis method has been developed to synthesize birnessite-type MnO2 nanosheets on carbon film at room temperature for supercapacitor electrode materials. The results clearly demonstrated that the specific capacitance of carbon/MnO2 composite electrodes was controlled by the adjustable UV-photolysis reaction time in KMnO4 solution. For the optimized composite electrode obtained after 2 h reaction, a superior specific capacitance of 277 F g−1 was achieved at current density of 0.2 A g−1. This finding suggests that UV-photolysis is a potential method to fabricate MnO2 on carbon film for supercapacitor. Keywords: UV-Photolysis, MnO2, Nanosheets, Carbon, Supercapacitor
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