Electrochemical properties of MmNi3.03Si0.85Co0.60Mn0.31Al0.08 hydrogen storage alloys in alkaline electrolytes—A cyclic voltammetric study at different temperatures |
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| Authors: | M. Raju L. Vijayaraghavan |
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| Affiliation: | a Nickel-Metal Hydride Battery Section, Electrochemical Power Systems Division, Central Electrochemical Research Institute, Karaikudi 630006, India
b Manufacturing Engineering Section, Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600036, India |
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| Abstract: | The cyclic voltammetric behavior of MmNi3.03Si0.85Co0.60Mn0.31Al0.08-based metal hydride electrode was studied in alkaline electrolytes at various temperatures (303, 308, 318 and 328 K). Electrochemical parameters such as limiting current density and corrosion potential were determined at these temperatures. The corrosion potential became more negative with increasing temperature. Hydrogen diffusivity was also found to increase with increasing temperature. From electrochemical discharge experiments, it was concluded that the charge transfer process was the rate-determining step. |
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| Keywords: | AB5-type metal hydride alloy Ni-MH battery Cyclic voltammogram Hydrogen diffusivity Corrosion potential |
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