报告题目：Structures and dynamics at electrochemical interfaces studied by nonlinear spectroelectrochemistry

        报 告 人：仝玉进    研究员

        单      位：杜伊斯堡大学

        报告时间：2024年7月22日10:00（星期一） 

        报告地点：教育大厦4040

        报告人简介：

        仝玉进，本科硕士毕业于哈尔滨工业大学，2010年博士毕业于日本北海道大学催化研究中心。现任德国杜伊斯堡大学物理系研究员，前马普学会Fritz Haber研究所“非线性光谱电化学研究组”课题组长，留德化学化工学会(CGCA)前理事长，国际电化学会，德国物理学会会员，Ertl电化学和催化中心的会员。多年来致力于先进表面科学表征方法的开发和应用，特别是成功将非线性激光光谱技术应用在电化学界面的检测上。得到国际同行的广泛关注和认可。以第一或通讯作者身份在Nat. Comm., Angew. Chem. Int., 以及 Ed., J. Am. Chem. Soc. 等国际主流学术期刊上发表研究论文60余篇。获邀评审法国国家科研署（ANR）经费项目，为国际知名刊物Nature系列，美国化学会刊物，德国化学会等期刊审稿人。他经常应邀在国际学术会议上做重要报告，还经常牵头组织中德之间的各种学术和科技交流活动。

        报告摘要：

        Electric double layer is the key component of electrochemistry, where reactants, products, ions and solvents follow certain spatial distribution at the interface. Currently the most accepted model is the Gouy-Chapman-Stern model (left panel of Figure 1), in which the interface has been divided into three region: the inner Helmholtz plane, where solvent and specific anions adsorb directly to the electrode; the outer Helmholtz plane, where solvated cations present; and the diffuse layer, where ions follow Poisson- Boltzmann distribution. However, this model is depicted based essentially on the thermodynamic measurements, i.e. the electrocapillary curve, surface excess, differential capacitance, etc. The molecular level information is still insufficient. Many of the recent observations cannot be explained by this qualitative model. For example, why different ions can affect the efficiency and selectivity of CO2 reduction? To gain such information, we have to directly probe the molecules and ions in the electric double layer. This is what we are doing in our group. A few examples are shown in the right panel of Figure 1. With VSFS, we have successfully probed the bias dependent structure of adsorbates on gold electrode, the chemical and physical nature of sulfate anions on Pt(111) surface. In addition, with the ultrashort lasers we were also able to investigate the dynamics of electrochemical processes, such as electron solvation on femto-second time scales. Based on these studies, a spectroscopic tool which can be employed to measured local electric field at electrochemical interfaces have also been reviewed.

 

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