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Potential-induced restructuring dynamics of ionic liquids on a gold electrode: Steric effect of constituent ions studied by surface-enhanced infrared absorption spectroscopy
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| Title: | Potential-induced restructuring dynamics of ionic liquids on a gold electrode: Steric effect of constituent ions studied by surface-enhanced infrared absorption spectroscopy |
| Authors: | Motobayashi, Kenta Browse this author | | Nishi, Naoya Browse this author | | Inoue, Yuki Browse this author | | Minami, Kazuya Browse this author | | Sakka, Tetsuo Browse this author | | Osawa, Masatoshi Browse this author →KAKEN DB |
| Keywords: | Spectroelectrochemistry | | Vibrational spectroscopy | | Solid/liquid interface | | Ionic liquid | | Electrical double layer | | Surface science |
| Issue Date: | 1-Sep-2017 |
| Publisher: | Elsevier |
| Journal Title: | Journal of electroanalytical chemistry |
| Volume: | 800 |
| Start Page: | 126 |
| End Page: | 133 |
| Publisher DOI: | 10.1016/j.jelechem.2017.02.049 |
| Abstract: | The structure of the interface between room temperature ionic liquids (RTILs) and an Au electrode changes with applied potential to compensate the charge on the electrode surface. The dynamics of the restructuring of RTILs triggered by the change in potential has been investigated by using surface-enhanced infrared absorption spectroscopy (SEIRAS). To elucidate the effect of steric hindrance of constituent ions on the potential-dependent dynamics, RTILs composed of differently sized ions are examined: imidazolium cations and bis(perfluoroalicylsulfonyl)amide anions with different (perfluoro)alkyl chain length, or tetrafluoroborate anion. The high interface selectivity and sensitivity of SEIRAS enables in-situ, real time observation of dynamic behaviors of both anions and cations during potential scans or steps. During potential scans for RTILs composed of sufficiently large ions (all the RTILs examined in the present study except for that includes BFT), a fast, barrier-less change in local ion concentration occurs in the overlayers first, and then a slow cation-anion replacement occurs in the first ionic layer directly contacting with the electrode surface when an overpotential exceeding a critical value is applied. SEIRAS reveals hysteretic changes of the interfacial structure arising from the ion replacement in the first ionic layer. Potential dependent SEIRAS measurements for RTILs with different ion sizes highlight the significance of steric hindrance of ions for the ion replacement in the first layer. (C) 2017 Elsevier B.V. All rights reserved. |
| Rights: | © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ | | http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/75313 |
| Appears in Collections: | 触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 本林 健太
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