Room-temperature facile synthesis of MnO2 on carbon film via UV-photolysis for supercapacitor

A facile UV-photolysis method has been developed to synthesize birnessite-type MnO 2 nanosheets on carbon film at room temperature for supercapacitor electrode materials. The results clearly demonstrated that the specific capacitance of carbon/MnO 2 composite electrodes was controlled by the adjustable UV-photolysis reaction time in KMnO 4 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 MnO 2 on carbon film for supercapacitor.