Laser-induced potential jump at the electrochemical interface probed by picosecond time-resolved surface-enhanced infrared absorption spectroscopy.
Laser-induced potential jump at the electrochemical interface probed by picosecond time-resolved surface-enhanced infrared absorption spectroscopy.
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DOI：
10.1021/jp060387d
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发表时间：
2006-03
期刊：
影响因子：
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通讯作者：
Akira Yamakata;T. Uchida;J. Kubota;M. Osawa
中科院分区：
文献类型：
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作者：
Akira Yamakata;T. Uchida;J. Kubota;M. Osawa
皮秒时间分辨表面增强红外吸收光谱（SEIRAS）首次被用来检查可见脉冲照射引起的电化学界面的电位跃变。利用 Pt 电极上吸附的 CO 的 C-O 伸缩振动的电势相关位移来监测电势跳跃。相对于可见光泵浦脉冲照射（532 nm，35 ps持续时间，3 mJ cm(-2)），观察到6 cm(-1)红移，延迟约200 ps。观察到的红移归因于 CO 面内受挫平移模式的加热和电势的负移。这两种贡献可以借助电极表面背景反射率的瞬态来分离。表面附近水层的加热主要是通过水分子的方向变化造成电势跳跃的原因。这种方法有望成为检查超快电极动力学的工具。
Picosecond time-resolved surface-enhanced infrared absorption spectroscopy (SEIRAS) has been used for the first time to examine the potential jump at the electrochemical interface induced by a visible pulse irradiation. The potential dependent shift of the C-O stretching vibration of CO adsorbed on a Pt electrode was utilized to monitor the potential jump. A 6-cm(-1) red-shift was observed with a time delay of approximately 200 ps with respect to a visible pump-pulse irradiation (532 nm, 35 ps duration, 3 mJ cm(-2)). The observed red-shift is ascribed to the heating of the in-plane frustrated translational mode of CO and the negative shift of potential. These two contributions can be separated with the aid of the transient of the background reflectivity of the electrode surface. The heating of water layers near the surface is mainly responsible for the potential jump through the orientation change of water molecules. This method is promising as a tool to examine ultrafast electrode dynamics.