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Indian Journal of Chemical Technology (IJCT) >
IJCT Vol.12 [2005] >
IJCT Vol.12(6) [November 2005] >
| Title: | Electrodeposition of cobalt from cobalt chloride-N-(n-butyl)pyridinium chloride molten salt |
| Authors: | Ali, M R
Nishikata, A
Tsuru, T |
| Keywords: | Electrodeposition
cobalt N-(n-butyl)pyridinium chloride |
| Issue Date: | Nov-2005 |
| Publisher: | CSIR |
| IPC Code: | C22B23/00; C25C1/08; C25D1/16; C01G51/00 |
| Abstract: | A molten salt system of CoCl2-N-(n-butyl)pyridinium
chloride (BPC) having melting point <80oC has been developed over
a wide composition range (1:2 to 1:1 mole ratio CoCl2-BPC) and the
electrodeposition of cobalt has been carried out by constant current and
constant potential methods at 110oC. Cobalt cannot be deposited from
a CoCl2-BPC melt containing BPC concentration higher than the mole
ratio of 1:2, whereas it can be deposited from BPC concentration lower than the
mole ratio of 1:2. The deposition reaction mechanisms of cobalt in the CoCl2-BPC
molten bath are revealed by electrochemical analysis. The experimental Tafel
slope of 62 mV dec-1 and the calculated transfer coefficient ( →c) of 1 (one) suggest that the rate determining step is a
chemical reaction involving the release of the complexing agents occurring
after first charge transfer step. X-ray diffractometer and scanning electron
microscope have been used to investigate the influence of electrodeposition
conditions and the morphology of the electrodeposited layers. The cathodic
current efficiency for the deposition of cobalt is about 98%. |
| Page(s): | 648-653 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Source: | IJCT Vol.12(6) [November 2005]
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