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Abstract
Electrochemical behaviour of cobalt salt was carried out on a glassy carbon electrode and a copper electrode (CuE) using aqueous cobalt(II) nitrate solution. The electrochemical behaviour was also studied on CuE using a hydrophilic ionic liquid, 1-ethyl-3-methylimidazolium ethylsulphate ([emim][EtSO4]). The [emim][EtSO4] has been found to be electroinactive in the reduction potential range of cobalt(II) ion, and electrodeposition could be successfully performed from [emim][EtSO4] at ambient condition. Scanning electron microscopic images of the deposited cobalt show that cobalt is deposited from [emim][EtSO4] in nanodimension, and the thickness of the deposited film depends on the time of electrolysis retaining the dimension of the electrodeposited cobalt on CuE.
The authors gratefully acknowledge the support for a subproject (CP 231) under the higher education quality enhancement project (HEQEP) of the University Grants Commission of Bangladesh supported by World Bank and Government of Bangladesh. FB also acknowledges a fellowship from Bose Centre for Advanced Research in Natural Sciences. MABHS is thankful to Professor Y. Katayama of the Department of Applied Chemistry, Keio University, Japan, for very useful discussion.
