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Redox and transport behaviors of Cu(I) ions in TMHA-Tf2N ionic liquid solution

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Abstract

The redox and transport behavior of monovalent copper species in an ammonium imide-type ionic liquid, trimethyl-n-hexylammonium bis((trifluoromethyl)sulfonyl)amide (TMHA-Tf2N) were examined with a micro-disc electrode to clarify its applicability to, for example, electroplating. It was found that the diffusion coefficient of Cu(I) ions in TMHA-Tf2N containing 12 mmol dm−3 Cu(I) ions was 1.2 × 10−6 cm2 s−1 and the redox potential of Cu(I)/Cu was in the potential range 0.1–0.2 V vs. I −/I −3 at 50 °C. The diffusion coefficient was one order smaller than that of Cu(II) ions in aqueous solution due to the high viscosity of the ionic liquid. The diffusion coefficient of Cu(I) ion increased with rising temperature and was 1.0 × 10−5 cm2 s−1 at 112 °C, which was comparable to that of Cu(II) ions in aqueous CuSO4 solutions at ambient temperature. This is accounted for by the drastic decrease in the viscosity of the ionic liquid solution with increasing temperature. The activation energy of diffusion was estimated to be 39 kJ mol−1 in the ionic liquid solution.

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Acknowledgements

The present work was supported in part by a Grant-in-Aid for Scientific Research (no. 16360374) from the Japan Society for the Promotion of Science (JSPS) and by Kyoto University 21st Century COE Program, United Approach to New Materials Science, from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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  1. Department of Materials Science and Engineering, Kyoto University, Yoshida-hommachi, Sakyo-ku, Kyoto, 606-8501, Japan

    Takuma Katase, Kuniaki Murase, Tetsuji Hirato & Yasuhiro Awakura

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  1. Takuma Katase
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  2. Kuniaki Murase
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  3. Tetsuji Hirato
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  4. Yasuhiro Awakura
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Correspondence to Kuniaki Murase.

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Katase, T., Murase, K., Hirato, T. et al. Redox and transport behaviors of Cu(I) ions in TMHA-Tf2N ionic liquid solution. J Appl Electrochem 37, 339–344 (2007). https://doi.org/10.1007/s10800-006-9262-4

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  • DOI: https://doi.org/10.1007/s10800-006-9262-4

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