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Synthesis and characterization of Cd-doped ZnMn2O4 microspheres as supercapacitor electrodes


In this paper, we demonstrate the effects of Cd-doping ZnMn2O4 on structural and electrochemical performance. Cd-doped ZnMn2O4 spheres with diameters of about 2 μm were successfully synthesized by a facile hydrothermal method at 200 °C for 18 h. The fabricated Cd-doped ZnMn2O4 samples were characterized by X-ray diffraction, scanning electron microscopy, Brunauer Emmett Teller surface area analyzer and X-ray photoelectron spectroscopy. The electrochemical performance was investigated by cyclic voltammetry and electrochemical impedance spectrometry. The experimental results show that the synthesized spherical Cd-doped ZnMn2O4 exhibit far better rate capability and cyclic stability than that of pure spinel porous ZnMn2O4 microspheres. The result of cyclic voltammetry measurement indicates that the obtained Cd-doped ZnMn2O4 microspheres exhibited the high specific capacitance of 364 Fg−1 at 2 mV/s.

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The authors are grateful for the financial support by the National Natural Science Foundation of China (Grant Nos. 11304120, 21505050), the Shandong Provincial Natural Science Foundation (ZR2013AM008, ZR2009FZ006, ZR2010EL017).

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Correspondence to X. Q. Wei or X. J. Xu.

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Wang, Y.L., Wei, X.Q., Guo, N. et al. Synthesis and characterization of Cd-doped ZnMn2O4 microspheres as supercapacitor electrodes. J Mater Sci: Mater Electron 28, 1223–1228 (2017).

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