Nanostructured manganese oxide films for high performance supercapacitors

Nanostructured manganese oxide films, including continuous coating, nanoflower film and nanowall array, were electrodeposited on nickel foils via anodic electrodeposition. The as-prepared samples were tested as electrodes for supercapacitors and excellent capacitive performances were achieved. Among them, the nanowall array, which was composed of interconnected ultrathin nanosheets, exhibited the highest specific capacitance of 327 F g^-1 at 1 A g^-1 .The specific capacitance could retain as high as 317 F g^-1 after 1000 cycles. The superior capacitance performance can be attributed to its unique nanoporous structure which facilitates fast ion transportation.