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      https://www.ias.ac.in/article/fulltext/boms/043/0004

    • Keywords

       

      Co-doped; ZnMn$_2$O$_4$; hollow microspheres; electrochemical properties.

    • Abstract

       

      Spinel structure Co-doped ZnMn$_2$O$_4$ nanocrystals were successfully synthesized by a hydrothermal method. The effects of Co-doping concentration on the structure and electrochemical properties of the samples were investigated.The experimental results manifest that all samples exhibit a single-phase with a tetragonal structure, and morphologies are regular hollow microspheres. Cyclic voltammetry curves for all samples are similar to a rectangular shape with symmetric nature and no obvious redox peak.Galvanostatic charge–discharge curves were triangular and symmetric. Impedance spectra revealed that Zn$_{1−x}$Co$_x$Mn$_2$O$_4$ possess low resistance. Better electrochemical properties of the ZnMn$_2$O$_4$ electrode could be obtained when the Co-doping ratio is 0.3. Zn$_{0.7}$Co$_{0.3}$Mn$_{2}$O$_4$ exhibits much higher specific capacitance (306 F g$^{−1}$) at a scan rate of 5 mV s$^{−1}$, and shows excellent cycling stability and retains 98.2% of its initial capacitance after 1000 cycles. The enhanced capacitive performance in this work can be attributed to the incorporation of Co ions doped into the ZnMn$_2$O$_4$ host lattice.

    • Author Affiliations

       

      XUELIANG ZHU1 2 ZHIQIANG WEI1 2 LONG MA2 JIAHAO LIANG2 XUDONG ZHANG2

      1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, People’s Republic of China
      2. School of Science, Lanzhou University of Technology, Lanzhou 730050, People’s Republic of China
    • Dates

       
  • Bulletin of Materials Science | News

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