Hydrogen bubbling-induced micro/nano porous MnO2 films prepared by electrodeposition for pseudocapacitor electrodes

Abstract Micro/nano porous manganese oxide MnO 2 electrodes for electrochemical energy storage were prepared by cathodic electrodeposition over stainless steel collectors using hydrogen bubbling as dynamic template. The morphology of the resulting film consisted of nanoporous MnO 2 crumpled nanosheets and homogeneously distributed micro-holes. The electrochemical studies revealed that the micro/nano porous MnO 2 electrodes displayed good pseudocapacitive response. The specific capacitance of the electrode was 305 F g −1 at 1 A g −1 in a potential window of 1 V, and the rate capability was 61% when the current density increased from 1 A g −1 to 10 A g −1 .