Preparation of Nickel and Manganese Oxides Composite via Co-precipitation Method and Its Electrochemical Properties

A simple co-precipitation using Na2CO3 as precipitation was used to get Nickel and manganese oxides (Ni–Mn oxides). After that process, there is a mixture of nickel oxide, manganese oxide and its solid solution. XRD and SEM were used to get the phase and morphology of the products. In 6 mol/L KOH aqueous electrolyte, electrochemical capacitance characterization were tested by cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrical impedance spectroscopy (EIS) measurements. The results show that When the Ni/Mn ratio is 3/1, Mn2O3 appears, and at this point the compounds are NiO and Mn2O3 complexes. And the electrochemical performance of this composite is better than that of single-phase NiO.