The effect of organic additives in electrodeposition of Co from an amide-type ionic liquid

Ryuta Fukui; Yasushi Katayama; Takashi Miura

doi:10.1016/j.electacta.2010.10.074

The effect of organic additives in electrodeposition of Co from an amide-type ionic liquid

Ryuta Fukui, Yasushi Katayama, Takashi Miura

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

68 Citations (Scopus)

Abstract

The effect of organic additives, coumarin and thiourea (TU), on the electrodeposition of cobalt (Co) was investigated in an amide-type ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA), containing Co(TFSA)₂ as a Co source. In case of addition of coumarin, the deposition potential of Co shifted to the positive side while there was no change in the coordination environment of Co²⁺. However, the surface morphology was changed by addition of coumarin, suggesting the specific adsorption of coumarin on the surface of electrode. On the other hand, the deposition potential of Co shifted to the more positive side by addition of TU, probably due to the change in the coordination environment of Co²⁺ from [Co(TFSA)₃]^- to [Co(TU)₄]²⁺. The diffusion coefficient of [Co(TU)₄]²⁺ was determined as 7.2 × 10^-8 cm² s^-1 at 27 °C by chronoamperometric method. The surface morphology of electrodeposit obtained from the electrolyte with TU was flat and less granular as compared to that without TU.

Original language	English
Pages (from-to)	1190-1196
Number of pages	7
Journal	Electrochimica Acta
Volume	56
Issue number	3
DOIs	https://doi.org/10.1016/j.electacta.2010.10.074
Publication status	Published - 2011 Jan 1

Keywords

Cobalt
Coumarin
Electrodeposition
Ionic liquid
Thiourea

ASJC Scopus subject areas

Chemical Engineering(all)
Electrochemistry

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10.1016/j.electacta.2010.10.074

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title = "The effect of organic additives in electrodeposition of Co from an amide-type ionic liquid",

abstract = "The effect of organic additives, coumarin and thiourea (TU), on the electrodeposition of cobalt (Co) was investigated in an amide-type ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA), containing Co(TFSA)2 as a Co source. In case of addition of coumarin, the deposition potential of Co shifted to the positive side while there was no change in the coordination environment of Co2+. However, the surface morphology was changed by addition of coumarin, suggesting the specific adsorption of coumarin on the surface of electrode. On the other hand, the deposition potential of Co shifted to the more positive side by addition of TU, probably due to the change in the coordination environment of Co2+ from [Co(TFSA)3]- to [Co(TU)4]2+. The diffusion coefficient of [Co(TU)4]2+ was determined as 7.2 × 10-8 cm2 s-1 at 27 °C by chronoamperometric method. The surface morphology of electrodeposit obtained from the electrolyte with TU was flat and less granular as compared to that without TU.",

keywords = "Cobalt, Coumarin, Electrodeposition, Ionic liquid, Thiourea",

author = "Ryuta Fukui and Yasushi Katayama and Takashi Miura",

note = "Funding Information: The present work was financially supported by Grant-in-Aid for Scientific Research on Priority Areas of “Science of Ionic Liquids” (No. 17073016 ) from the Ministry of Education, Culture, Sports, Science, and Technology, Japan (MEXT). ",

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AU - Fukui, Ryuta

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AU - Miura, Takashi

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N2 - The effect of organic additives, coumarin and thiourea (TU), on the electrodeposition of cobalt (Co) was investigated in an amide-type ionic liquid, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA), containing Co(TFSA)2 as a Co source. In case of addition of coumarin, the deposition potential of Co shifted to the positive side while there was no change in the coordination environment of Co2+. However, the surface morphology was changed by addition of coumarin, suggesting the specific adsorption of coumarin on the surface of electrode. On the other hand, the deposition potential of Co shifted to the more positive side by addition of TU, probably due to the change in the coordination environment of Co2+ from [Co(TFSA)3]- to [Co(TU)4]2+. The diffusion coefficient of [Co(TU)4]2+ was determined as 7.2 × 10-8 cm2 s-1 at 27 °C by chronoamperometric method. The surface morphology of electrodeposit obtained from the electrolyte with TU was flat and less granular as compared to that without TU.

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KW - Cobalt

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KW - Ionic liquid

KW - Thiourea

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The effect of organic additives in electrodeposition of Co from an amide-type ionic liquid

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