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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.

Highlights: [•] A surface-to-surface contact between graphene and SnO2 nanoplates is synthesized for the first time. [•] The synthesized method is easier to implement without template. [•] The as-synthesized materials exhibit high-performance supercapacitor than pure SnO2 and other SnO2/graphene nanocomposites. [ABSTRACT FROM AUTHOR]