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      https://www.ias.ac.in/article/fulltext/boms/043/0165

    • Keywords

       

      Electrodeposition; electrochemical capacitor; electrochemical impedance spectroscopy; equivalent circuit.

    • Abstract

       

      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.

    • Author Affiliations

       

      AVTAR SINGH1 2 DAVINDER KUMAR1 2 ANUP THAKUR2 BALRAJ SINGH SAINI3 RAMINDER KAUR2

      1. Department of Physics, Punjabi University, Patiala 147 002, India
      2. Department of Basic and Applied Sciences, Punjabi University, Patiala 147 002, India
      3. Department of Mechanical Engineering, Punjabi University, Patiala 147 002, India
    • Dates

       
  • Bulletin of Materials Science | News

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    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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