A Comparative Study of Potentiostatic and Potentiodynamic Method in the Synthesis of MnO2 Films for Electrochemical Capacitors
Nanostructured ε-manganese dioxide films are deposited directly on three-dimensional nickel foam (NF) from 0.25 M Mn(CH3COO)2 by means of the potentiostatic method (PSM) and potentiodynamic method (PDM). The prepared MnO2 films are characterized by X-ray diffraction and scanning electron microscopy. The electrochemical properties of MnO2 films are investigated by cyclic voltammetry (CV), charge-discharge tests, and alternating current (AC) impedance spectroscopy. The results show that the PSM-MnO2 films exhibit higher specific capacitance and better high-rate discharge ability, which are more promising for applications in supercapacitor than PDM-MnO2 films. The specific capacitance of PSM-MnO2 films is about 664 F g-1 at 5.5 A g-1, which is higher than many reported values.
Zhong Cao, Xueqiang Cao, Lixian Sun, Yinghe He
L. B. Kong et al., "A Comparative Study of Potentiostatic and Potentiodynamic Method in the Synthesis of MnO2 Films for Electrochemical Capacitors", Advanced Materials Research, Vols. 239-242, pp. 501-505, 2011