From spinel Mn_3O_4 to layered nanoarchitectures using electrochemical cycling and the distinctive pseudocapacitive behavior

摘要

In this letter the authors show the structure transformation from distorted spinel Mn_3O_4 to layered structure birnessite by cyclic voltammetry (CV) cycling in aqueous Na_2SO_4 using the high temperature (900℃) treated manganese oxide film as the electrode. The process is a dynamic-potential activated procedure, which causes the formation of sheet-shaped nanoarchitectures. During the cycling process, the specific capacitance of manganese oxide increases by more than 20 times, and the resulting film after 1000 CV cycles shows good power capability.