The interfaces of room-temperature ionic liquids-metals have been investigating recently. In this report, the electric field of double layer was estimated from the electrochemical vibrational Stark shift of CO on platinum electrode by sum frequency generation spectroscopy. The double layer thickness was deduced from both vibrational Stark shift of CO and the double layer capacitance by electrochemical impedance spectroscopy. The effect of alkyl chain length of imidazolium ionic liquids was considered. In addition, mixtures of acetonitrile and [BMIM][BF4] were investigated to determine the transition from ionic liquid to nonaqueous electrolyte solution behavior in double layer structure. A model of the ionic liquid-metal interface will be presented.

Double layer structure of platinum-ionic liquid interfaces probed by sum frequency generation spectroscopy and electrochemical impedance spectroscopy

247th National Meeting (2014)

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