A preliminary study of the pseudo-capacitance features of strontium doped lanthanum manganite

The intrinsically poor electrical conductivity of transition metal oxides is a critical challenge to obtain high electrochemical performance when these materials are used as the electrode of supercapacitors. In this study, the pseudo-capacitance features of perovskite (La0.75Sr0.25)(0.95)MnO3-delta (LSM) having a high electric conductivity of 44.9 S cm(-1) at room temperature was preliminarily investigated. The easily prepared LSM electrode was characterized by cyclic voltammetry and galvanostatic charge-discharge method to evaluate its electrochemical performances. The results show that LSM has pseudo-capacitance features and the specific capacitance is 56 F g(-1) at a scanning rate of 2 mV s(-1). This is the first report on the pseudo-capacitance value of LSM. Furthermore, the electrodes show no obvious capacitance degradation after 1000 cycles.