Structure of [C4mpyr][NTf2] Room-Temperature Ionic Liquid at Charged Gold Interfaces

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• 作者：Yansen Lauw ; Michael D. Horne ; Theo Rodopoulos ; Vera Lockett ; Bulent Akgun ; William A. Hamilton ; Andrew R. J. Nelson
• 刊名：Langmuir
• 出版年：2012
• 出版时间：May 15, 2012
• 年：2012
• 卷：28
• 期：19
• 页码：7374-7381
• 全文大小：310K
• 年卷期：v.28,no.19(May 15, 2012)
• ISSN：1520-5827

文摘

The structure of 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([C₄mpyr][NTf₂]) room-temperature ionic liquid at an electrified gold interface was studied using neutron reflectometry, cyclic voltammetry, and differential capacitance measurements. Subtle differences were observed between the reflectivity data collected on a gold electrode at three different applied potentials. Detailed analysis of the fitted reflectivity data reveals an excess of [C₄mpyr]⁺ at the interface, with the amount decreasing at increasingly positive potentials. A cation rich interface was found even at a positively charged electrode, which indicates a nonelectrostatic (specific) adsorption of [C₄mpyr]⁺ onto the gold electrode.