Journal
BULLETIN OF MATERIALS SCIENCE
Volume 43, Issue 1, Pages -Publisher
INDIAN ACAD SCIENCES
DOI: 10.1007/s12034-019-1970-6
Keywords
Co-doped; ZnMn2O4; hollow microspheres; electrochemical properties
Categories
Funding
- National Natural Science Foundation of China [51261015]
- Natural Science Foundation of Gansu Province, China [1308RJZA238]
- open Foundation of State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology) [SYSJJ2018-20]
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Spinel structure Co-doped ZnMn2O4 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 Zn1-xCoxMn2O4 possess low resistance. Better electrochemical properties of the ZnMn2O4 electrode could be obtained when the Co-doping ratio is 0.3. Zn0.7Co0.3Mn2O4 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 ZnMn2O4 host lattice.
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