(6月18日)In situ Vibration Sum Frequency Generation Spectroscopic Probe of Molecular Structures and Dynamics at Electrochemical Interfaces
新闻类型:学术活动  阅读次数:  发布时间:2019-06-06

报告题目:In situ Vibration Sum Frequency Generation Spectroscopic Probe of Molecular Structures and Dynamics at Electrochemical Interfaces

人:连天泉教授

报告时间:2019618号下午2:30至5:30

报告地点:化学学院嘉锡楼413

  Hybrid electrodes composed of molecular catalysts immobilized onto semiconductor or metal electrodes offer a promising approach for the rational design of electro- and photoelectron- catalytic system. The design and improvement of such devices requires fundamental understanding of the structure and dynamics of catalysts as well as the electrolyte environment at electrode-liquid interfaces. Vibrational sum frequency generation (VSFG) spectroscopy is an in situ interface specific technique capable of probing electrochemical interfacial properties at the molecular level. In this talk, we discuss our recent efforts in developing and applying VSFG for studying structural and dynamics of a series of rhenium bipyridyl CO2 reduction catalysts on semiconductor and metal electrodes. We have shown that by combining VSFG experiment with ab initio computational studies, catalyst adsorption geometry can be determined; by IR pump/VSFG probe, ultrafast vibration energy transfer dynamics of the catalyst can be probed with subpicosecond time resolution and sub-monolayer sensitivity; through electrochemical Stark effect, local electric field at the electrode-solution interface can be directly measured; the dependence of interfacial pH on applied bias can be probed; and finally this technique can be used to follow surface bound reactive intermediates of CO2 reduction.

报告人简介:

Tianquan (Tim) Lian received MS degree from Fujian Institute of Research on the Structure of Matter (under the supervision of Prof. Hongyuan Shen) and PhD degree from University of Pennsylvania (under the supervision of late Prof. Robin Hochstrasser) in 1993. After postdoctoral training with Prof. Charles B. Harris in the University of California at Berkeley, Tim Lian joined the faculty of chemistry department at Emory University in 1996, where he was promoted to Associate Professor in 2002, Full Professor in 2005, Winship Distinguished Research Professor in 2007, and William Henry Emerson Professor of Chemistry in 2008. Tim Lian is currently the Editor-in-Chief of the Journal of Chemical Physics (since Jan. 1, 2019). Tim Lian was an Editor of Chemical Physics (2012-2018), and has received a few notable recognitions including: Kavli Frontier of Science fellow (since 2012), APS fellow (since 2015), NSF CAREER award and Alfred P. Sloan fellowship. Tim Lian’s research interest is focused on ultrafast energy and charge transfer dynamics in photovoltaic and photocatalytic nanomaterials and at their interfaces.

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