Synthesis of LaMnO3-reduced graphene oxide or Sr composite and their application in electrochemical properties

Abstract

Perovskite structural metal oxides as electrode materials present promising and potential properties due to excellent storage characteristics. Herein, series of perovskite type LaMnO _3 nanopowders were synthesized by the ‘sol-gel’ method with a heat treatment at different temperatures (700 °C–900 °C) for different times. The morphology characterization, structures and electrochemical performances were investigated. The preferable sample for electrochemical energy storage device can be obtained at 900 °C with 2 h annealing. Furthermore, to improve the properties of the electrode materials, the samples were combined and rectified with reduced graphene oxide (rGO) and strontium (Sr), respectively. The results indicate that the rGO/Sr-doped LaMnO _3 oxide materials have excellent electrochemical properties. These findings are beneficial for the selection and preparation of electrode materials.

Keywords

• LaMnO3
• sol-gel method
• LaMnO3/rGO(LaMnO3/Sr) composites
• electrochemical properties
• energy storage device