Yang Yao-Yue, Zhang Li-Na, Osawa Masatoshi, Cai Wen-Bin
†Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry, Fudan University, Shanghai 200433, China.
‡Catalysis Research Center, Hokkaido University, Sapporo 001-0021, Japan.
J Phys Chem Lett. 2013 May 16;4(10):1582-6. doi: 10.1021/jz400657t. Epub 2013 Apr 24.
ATR-SEIRAS is extended for the first time to study potential-induced surface and interface structure variation of a CO-covered Pt electrode in a room-temperature ionic liquid of N-butyl-N-methyl-piperidinium bis((trifluoromethyl)sulfonyl)imide (or [Pip14][TNf2]). Owing to a wide effective potential window of [Pip14][TNf2], a gradual conversion from bridged COad (COB) to terminal COad (COL) is observed in response to positively going potentials, suggesting that Pip14 may be involved in a strong electrostatic interaction with the COad. This site conversion enables the ratio of the apparent absorption coefficient of COL to that of COB to be determined. Also, the spectral results reveal the potential-dependent COad frequency variations as well as the potential-induced interfacial ionic reorientation and movement at the Pt/CO/[Pip14][TNf2] interface.
衰减全反射-表面增强红外吸收光谱（ATR-SEIRAS）首次得到扩展，用于研究在N-丁基-N-甲基哌啶双（（三氟甲基）磺酰）亚胺（或[Pip14][TNf2]）室温离子液体中，CO覆盖的Pt电极的电位诱导表面和界面结构变化。由于[Pip14][TNf2]具有较宽的有效电位窗口，随着正电位的增加，观察到桥连吸附的CO（COB）逐渐转变为末端吸附的CO（COL），这表明[Pip14]+可能与吸附的CO发生强烈的静电相互作用。这种位点转换使得能够确定COL与COB的表观吸收系数之比。此外，光谱结果揭示了电位依赖的吸附CO频率变化，以及在Pt/CO/[Pip14][TNf2]界面处电位诱导的界面离子重新取向和移动。
