From spinel Mn3O4 to layered nanoarchitectures using electrochemical cycling and the distinctive pseudocapacitive behavior

Abstract

In this letter the authors show the structure transformation from distorted spinel Mn 3 O 4 to layered structure birnessite by cyclic voltammetry (CV) cycling in aqueous Na 2 S O 4 using the high temperature ( 900 ° C ) 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.