Abstract
Mesoporous Mn–Ni oxides with the chemical compositions of Mn1-x Ni x O δ (x = 0, 0.2, and 0.4) were prepared by a solid-state reaction route, using manganese sulfate, nickel chloride, and potassium hydroxide as starting materials. The obtained Mn–Ni oxides, mainly consisting of the phases of α- and γ-MnO2, presented irregular mesoporous agglomerates built from ultra-fine particles. Specific surface area of Mn1–x Ni x O δ was 42.8, 59.6, and 84.5 m2 g−1 for x = 0, 0.2, and 0.4, respectively. Electrochemical properties were investigated by cyclic voltammetry and galvanostatic charge/discharge in 6 mol L−1 KOH electrolyte. Specific capacitances of Mn1-x Ni x O δ were 343, 528, and 411 F g−1 at a scan rate of 2 mV s−1 for x = 0, 0.2, and 0.4, respectively, and decreased to 157, 183, and 130 F g−1 with increasing scan rate to 100 mV s−1, respectively. After 500 cycles at a current density of 1.24 A g−1, the symmetrical Mn1–x Ni x O δ capacitors delivered specific capacitances of 160, 250, and 132 F g−1 for x = 0, 0.2, and 0.4, respectively, retaining about 82%, 89%, and 75% of their respective initial capacitances. The Mn0.8Ni0.2O δ material showed better supercapacitive performance, which was promising for supercapacitor applications.
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Acknowledgements
This work is financially supported by the Natural Science Foundation of Education Commission of Anhui Province under Grant nos. KJ2008A003 and KJ2009B050. The financial support provided by the Innovation Project of Anhui University of Technology and the Foundation of Young Teachers of Anhui University of Technology (Grant no.QZ200804) is gratefully acknowledged.
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Fang, DL., Wu, BC., Yan, Y. et al. Synthesis and characterization of mesoporous Mn–Ni oxides for supercapacitors. J Solid State Electrochem 16, 135–142 (2012). https://doi.org/10.1007/s10008-011-1306-y
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DOI: https://doi.org/10.1007/s10008-011-1306-y