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 (La_0.75Sr_0.25)_0.95MnO_3-δ (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.