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

Abstract

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.