High specific surface area MnO2 electrodeposited under supergravity field for supercapacitors and its electrochemical properties

MnO2 electrode material is successfully synthesized by electrodeposition under supergravity field from manganese acetate solution. The structure of the samples is characterized by X-ray diffraction. The results show that the product is gamma-MnO2. Galvanostatic charge/discharge measurements are applied to investigate electrochemical performances of the MnO2 electrodes material prepared under different supergravity fields. MnO2 synthesized under rotational speed 3000 rpm exhibits the highest specific surface area and discharge capacitance, the values of which are 68.6% and 19.3% higher than that under normal gravity fields, respectively. It is found that supergravity field can improve the electrochemical performance of MnO2 material. (C) 2012 Elsevier B.V. All rights reserved.