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Tamura, Kazuhisa; Miyaguchi, Shinichiro*; Sakaue, Kiyoshi*; Nishihata, Yasuo; Mizuki, Junichiro
Electrochemistry Communications, 13(5), p.411 - 413, 2011/05
Times Cited Count：13 Percentile：32.22(Electrochemistry)The surface structure of Au(111) electrodes in hydrophobic ionic liquids, 1-butyl-1-methylpyrrolidinium bis (trifluoromethylsulfonyl)amide ([BMP]TFSA) and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([BMIM]TFSA) was investigated using surface X-ray scattering. In both [BMP]TFSA and [BMIM]TFSA, the reconstruction of the surface structure was observed and the phase transition between the (1
1) and the reconstructed structure was found to be reversible. On the other hand, the area of the reconstructed structure in [BMP]TFSA was larger than that in [BMIM]TFSA. These differences suggest that the [BMIM]
-Au interaction is stronger than the [BMP]-Au interaction.
Miyaguchi, Shinichiro; Tamura, Kazuhisa; Sakaue, Kiyoshi*; Nishihata, Yasuo
no journal, ,
Surface structures of Au(111) electrode in two ionic liquids (IL), [BMP]TSFA and [BMIM]TSFA was investigated using surface X-ray scattering. In water electrolyte, the restructureing of Au(111) from (11) to (p
) structure occurs within about 100 mV, however, in ionic liquids it occurs within about 600 mV, indicating that mobility of Au atoms at IL/Au inteface is smaller than that at water/Au interface. The structure of restructured (p) domain was also investigated using surface X-ray diffraction, however, the diffraction peak originated from (p) domain wasn't observed at any electrode potential. This result may suggest that the domain size of (p) structure in IL is smaller than that in water electrolyte.
Tamura, Kazuhisa; Miyaguchi, Shinichiro*; Sakaue, Kiyoshi*; Nishihata, Yasuo
no journal, ,
Potential dependence of Au(111) electrode surface structure in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide ([BMP]TFSA) was investigated using in-situ surface X-ray scattering. In the electrochemical window of Au(111) electrode in [BMP]TFSA, three potential regions, that is, reconstruction region (E 
-1.5 V vs. Ag/Ag), (1 1) region (-1.5 E 0.05 V), and (1 1)-II region (0.05 E 0.9 V), were found. In reconstruction region, (1 1) structure turns to reconstructed structure gradually and the reconstructed structure reversibly returns to (1 1) structure in (1 1) region. At the potential between (1 1) and (1 1)-II regions, dips were observed in diffracted intensity originated from (1 1) structure. At this potential, a phase transition, which causes temporary disordering of Au(111) surface, may occur in double layer.
Tamura, Kazuhisa; Miyaguchi, Shinichiro*; Sakaue, Kiyoshi*; Nishihata, Yasuo
no journal, ,
Potential dependence of Au(111) electrode surface structure in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide ([BMP]TFSA) was investigated using in-situ surface X-ray scattering. In the electrochemical window of Au(111) electrode in [BMP]TFSA, three potential regions, that is, reconstruction region (E -1.5 V vs. Ag/Ag), (11) region (-1.5 E 0.05 V), and (11)-II region (0.05 E 0.9 V), were found. In reconstruction region, (11) structure turns to reconstructed structure gradually and the reconstructed structure reversibly returns to (11) structure in (11) region. At the potential between (11) and (11)-II regions, dips were observed in diffracted intensity originated from (11) structure. At this potential, a phase transition, which causes temporary disordering of Au(111) surface, may occur in double layer.
Tamura, Kazuhisa; Miyaguchi, Shinichiro*; Sakaue, Kiyoshi*; Nishihata, Yasuo
no journal, ,
Ionic liquid (IL) is a molten salt at room temperature. Most of ionic liquids consist of organic moleculars; thus, ionic liquids can be designed for desired purposes. Recently, they've been recognized the third solvent and electrolyte. Especially, TFSA anion has strong hydrophobicity; thus TFSA based IL can be used under atomosphere. On the other hand, behaviors of IL/electrode interface have been uncovered due to technical diffulties. In this study, potential dependence of Au(111) surface structure was studied in [BMP] and [BMI]TFSA using surface X-ray diffraction.
