Cycling tests for LaCoO3-based symmetric supercapacitors were carried out. The change in the valence state of Co in the electrode surface active material, LaCoO3, before and after the cycling test was investigated by X-ray photoelectron spectroscopy.
Compounding of Fe2O3 with MgFe2O4, leading to morphological changes and synergistic effects, resulting in significantly improved cycling stability of supercapacitor sheet electrode.
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