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Received October 8, 2013
Accepted February 12, 2014
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Electrochemical properties of Bi-Ni and Bi-Ni-Mn composite-coated electrolytic manganese dioxide
Henan Provincial Key Laboratory of Surface & Interface, Zhengzhou University of Light Industry, Zhengzhou 450002, China
lixiaofeng630@163.com
Korean Journal of Chemical Engineering, June 2014, 31(6), 1070-1075(6), 10.1007/s11814-014-0055-x
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Abstract
The Bi-Ni and Bi-Ni-Mn composite is separately coated on the surface of commercial electrolytic manganese dioxide (EMD) by using a simple chemical precipitation/oxidation method. The results of X-ray diffraction show that a structure of γ-MnO2 is kept for all the coated EMD, but the intensity of their diffraction peaks is lower than uncoated one. Both the Bi0.5-Ni0.5 and Bi0.35-Ni0.35-Mn0.3 composite benefits the discharge capacity and high-power performance of the EMD electrodes. On the other hand, the results of scanning electron microscopy and energy dispersive spectroscopy confirm the more uniform distribution of the Bi0.15-Ni0.55-Mn0.3 composite on the surface of EMD than the Bi0.5-Ni0.5 one, thereby resulting in better cyclability of the electrodes. After 50 cycles at a 1C rate, the capacity retention rate of the Bi0.15-Ni0.55-Mn0.3 composite-coated electrode reaches to 80%, which is far larger than the un-coated (49%) and the Bi0.5-Ni0.5 composite-coated (63%) one.
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References
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Nartey VK, Binder L, Huber A, J. Power Sources, 87(1-2), 205 (2000)
Minakshi M, Blackford M, Ionescu M, J. Alloy Compd., 509, 5974 (2011)
Li X, Li Z, Xia T, Dong H, Song Y, Wang L, J. Phys. Chem. Solids, 73, 1229 (2012)
Yuan ZY, Zhang ZL, Du GH, Ren TZ, Su BL, Chem. Phys. Lett., 378(3-4), 349 (2003)
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Anderson TN, Derby JM, in Electrochemistry in transition, O. J. Murphy Eds., Plenum, New York (1992)
