Electrochemical Performance of MnO2/C Electrodes in Neutral Aqueous Electrolytes

The surface of carbon electrodes has been modified by manganese oxide nanoparticles via anodic electrochemical deposition. The structural properties and elemental composition of the resultant MnO2/C materials have been studied by energy dispersive X-ray microanalysis and transmission electron microscopy. Electrochemical characteristics of the electrodes have been investigated by cyclic voltammetry, galvanostatic charge–discharge measurements, and impedance spectroscopy. We have compared the specific capacitance of the MnO2/C electrodes in 0.5 M Li2SO4, Na2SO4, and K2SO4 solutions. The materials studied have been shown to have the highest specific capacitance in the sodium sulfate solution.