Abstract
Porous MnO2/Co composites with regular ellipse shape were synthesized through a facile hydrothermal‐decomposition method. Coembedded manganese oxalate precursors were firstly synthesized by a hydrothermal process. Then, Mn2O3/Co composites were obtained by a following precisely controlled decomposition process. After a further oxidation reaction, nanofibrous MnO2/Co composites were formed with well‐retained ellipse microframework inherited from precursors. X‐ray diffractometer (XRD), thermogravimetry and differential thermal analysis (TG‐DTA), field‐emission scanning electron microscope (FESEM), and energy dispersive spectroscope (EDS) were used to characterize the composition, structure, and morphology of all the samples. The electrochemical properties of MnO2/Co were studied using cyclic voltammetry and galvanostatic charge–discharge test in 1.0 mol/L Na2SO4 electrolyte. Doping of Co in an appropriate range can improve the electrochemical performance of MnO2.
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