Abstract
Spinel structure Co-doped \(\hbox {ZnMn}_{{2}}\hbox {O}_{{4}}\) 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 \(\hbox {Zn}_{1-x}\hbox {Co}_{{x}}\hbox {Mn}_{{2}}\hbox {O}_{{4}}\) possess low resistance. Better electrochemical properties of the \(\hbox {ZnMn}_{{2}}\hbox {O}_{{4}}\) electrode could be obtained when the Co-doping ratio is 0.3. \(\hbox {Zn}_{0.7}\hbox {Co}_{0.3}\hbox {Mn}_{{2}}\hbox {O}_{{4}}\) exhibits much higher specific capacitance (\(306\hbox { F g}^{-1}\)) at a scan rate of \(5\hbox { mV s}^{-1}\), 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 \(\hbox {ZnMn}_{{2}}\hbox {O}_{{4}}\) host lattice.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 51261015), the Natural Science Foundation of Gansu Province, China (No. 1308RJZA238) and the open Foundation of State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology) (No. SYSJJ2018-20).
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Zhu, X., Wei, Z., Ma, L. et al. Synthesis and electrochemical properties of Co-doped \(\hbox {ZnMn}_{2}\hbox {O}_{4}\) hollow nanospheres. Bull Mater Sci 43, 4 (2020). https://doi.org/10.1007/s12034-019-1970-6
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DOI: https://doi.org/10.1007/s12034-019-1970-6