• DAVINDER KUMAR

      Articles written in Bulletin of Materials Science

    • Enhanced performance of Fe-doped manganese oxide films as supercapacitor electrodes

      AVTAR SINGH DAVINDER KUMAR ANUP THAKUR BALRAJ SINGH SAINI RAMINDER KAUR

      More Details Abstract Fulltext PDF

      This paper reports enhancement in the specific capacitance of iron-doped manganese oxide (MnO$_2$) films, potentiostatically deposited on stainless-steel substrates. The properties of deposited films were investigated through cyclicvoltammetry and galvanostatic charge/discharge characteristics. The specific capacitance, as determined through cyclic voltammetry and galvanostatic charge/discharge characteristics, respectively, was found to be 248.79 and 277.5 F g$^{−1}$ for undoped films, whereas it exhibited an increase with doping and was found to be 449.61 and 487.5 F g$^{−1}$, respectively, corresponding to a dopant concentration of 4 atomic percentage. The electrochemical impedance data were fitted with a modified Randles equivalent circuit to find series resistance, charge-transfer resistance, double-layer capacitance and iondiffusion. According to electrochemical impedance spectroscopy, the enhancement of ion diffusion was found to be the major cause for enhancement in capacitive performance of the films.

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