Hysteresis of Potential-Dependent Changes in Ion Density and Structure of an Ionic Liquid on a Gold Electrode: In Situ Observation by Surface-Enhanced Infrared Absorption Spectroscopy

DOI Web Site 49 Citations 37 References
  • Kenta Motobayashi
    Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan
  • Kazuya Minami
    Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
  • Naoya Nishi
    Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
  • Tetsuo Sakka
    Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
  • Masatoshi Osawa
    Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan

Bibliographic Information

Published
2013-09-03
Resource Type
journal article
DOI
  • 10.1021/jz401645c
Publisher
American Chemical Society (ACS)

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Description

Potential-dependent structure and dynamics of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide ([BMIM][TFSA]) on an Au electrode have been investigated by using surface-enhanced infrared absorption spectroscopy (SEIRAS). In situ, real-time IR measurements during potential scans enable us to probe a hysteretic exchange and reorientation of both the cation and anion at the interface simultaneously owing to the high interface selectivity and sensitivity of SEIRAS. Our experimental results reveal that during potential scans, the ion density in overlayers changes first, and then the exchange of the ions in the first ionic layer occurs to compensate the changes in surface charge.

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