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Vol. 28 No. 11 (2016): Vol 28 Issue 11

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Effect of Addition of Ethylene Glycol on Electrodeposition of Cobalt in 1-Ethyl-3-methylimidazolium Bromide-Cobalt Bromide Molten Salt

https://doi.org/10.14233/ajchem.2016.20075
Chang-Suk Han
Department of Defense Science & Technology, Hoseo University, Hoseo-ro 79beon-gil, Baebang-Myun, Asan City, Chungnam 31499, Republic of Korea
Tae-Soo Jang
Department of Nanobiotronics, Hoseo University, Hoseo-ro 79beon-gil, Baebang-Myun, Asan City, Chungnam 31499, Republic of Korea

Corresponding Author(s) : Chang-Suk Han

hancs@hoseo.edu

Asian Journal of Chemistry, Vol. 28 No. 11 (2016): Vol 28 Issue 11

Abstract

Activities of the cobalt ionic species in the 1-ethyl-3-methylimidazolium bromide (EMIB)-CoBr2-ethylene glycol (EG) baths were calculated by the computer simulation method fitting the measured and calculated rest potential of cobalt and the relationships between the calculated activities and the results of the actual cobalt electrodeposits were considered. Smooth and metallic coloured cobalt deposits with 100 % of cathodic current efficiencies even at high current densities of 200-300 Am–2 were obtained from baths in which the activities of CoBr42– were dominant compared with those of CoBr3– and Br–. This suggests that CoBr42– is the effective cobalt ionic species for cobalt electrodeposition. At compositions where the activities of CoBr3– were relatively high, the dendritic deposits were obtained at the edge of the substrate. The reduction of CoBr3– causes the dendritic deposits. The appropriate amount of ethylene glycol addition to EMIB-CoBr2 bath promotes the formation of CoBr42– that forms the smooth cobalt deposits.

Keywords

Cobalt Electrodeposition CoBr2 Cathodic current efficiency Dendritic deposits
Han, C.-S., & Jang, T.-S. (2016). Effect of Addition of Ethylene Glycol on Electrodeposition of Cobalt in 1-Ethyl-3-methylimidazolium Bromide-Cobalt Bromide Molten Salt. Asian Journal of Chemistry, 28(11), 2524–2528. https://doi.org/10.14233/ajchem.2016.20075
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