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Influence of Zinc Additive and pH on Electrochemical Behaviour of b-Nickel Hydroxide in Nickel Based Secondary Batteries

https://doi.org/10.14233/ajchem.2016.19355
C.R. Ravi Kumar
Research Centre, Department of Chemistry, East West Institute of Technology, Bangalore-560 091, India
P. Kotteeswaran
Department of Chemistry, Renganayagi Varatharaj College of Engineering, Salvarpatti-626128, India
M.S. Santosh
Centre for Emerging Technologies, Jain University, Jain Global Campus, 45th km, NH-209, Jakkasandra Post, Kanakapura Taluk, Ramanagaram-562 112, India
B. Shruthi
Department of Chemistry, Dr. Ambedkar Institute of Technology, Bangalore-560 056, India
V. Bheemaraju
Department of Chemistry, Dr. Ambedkar Institute of Technology, Bangalore-560 056, India
M.S. Shivakumara
Department of Chemistry, ACS College of Engineering, Bangalore-560 074, India
H.P. Nagaswarupa
Research Centre, Department of Chemistry, East West Institute of Technology, Bangalore-560 091, India

Corresponding Author(s) : C.R. Ravi Kumar

ravicr101@yahoo.com

Asian Journal of Chemistry, Vol. 28 No. 1 (2016): Vol 28 Issue 1

Abstract

Nickel(II) hydroxide has been prepared by co-precipitation method with various concentrations of Zn additives (2, 4, 6 and 8 wt %) under different pHs (8, 9, 10 and 11). The elemental composition of zinc substituted nickel hydroxide samples were studied using energy dispersive X-ray analysis and the b-form of Ni(OH)2 samples were confirmed by X-ray diffraction and Fourier transform infrared spectroscopy. The interlayer distance (c0) is found to expand with an increase in the percentage of zinc additives. The amount of SO42-, CO32- and H2O adsorbed by the crystals and the thermal stability of b-Ni(OH)2 are dependent on the pH. Under relatively high pH value, the synthesized nickel hydroxide materials possess an increasing degree of order and crystallinity, lower thermal stability, lower taping density and higher Ni composition. The electrochemical properties of the synthesized Ni(OH)2 materials were analyzed using cyclic voltammetry and electrochemical impedance spectroscopy. It is evident from the experimental data that the redox reactions exhibit quasi-reversible nature for all electrodes except for electrode C indicating that the charge and discharge process of the latter showed better reversibility compared to other electrodes. The electrochemical studies also indicate that zinc-ion additive is successful in increasing the reversibility of the electrode reaction and also the capacitance of the electrode.

Keywords

Nickel hydroxide Additive pH Interplanar distance Tapping density Cyclic voltammetry
Kumar, C. R., Kotteeswaran, P., Santosh, M., Shruthi, B., Bheemaraju, V., Shivakumara, M., & Nagaswarupa, H. (2015). Influence of Zinc Additive and pH on Electrochemical Behaviour of b-Nickel Hydroxide in Nickel Based Secondary Batteries. Asian Journal of Chemistry, 28(1), 221–229. https://doi.org/10.14233/ajchem.2016.19355
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