Coupling of Mechanics and Reakctivity
Contact: Jörg Weißmüller
https://www.tuhh.de/wp/staff/wpms/wpms.de.html
The elastic deformation of the matter at surfaces affects the surface electronic band structure and the surface dipole. Thereby, the surface mechanics is coupled to the work function, to then enthalpies of adsorption, and to the catalytic activity. The phenomenology remains largely unexplored. Along with the underlying microscopic processes it is the subject of current research. Closely linked to the question of surface electro-chemo-mechanical coupling are open issues relating to the origin, magnitude, and consequences of capillary forces at solids surfaces, specifically in the presence of excess electric charge or of adsorbed species.
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Work function, W, of differently oriented gold crystal surfaces versus the tangen- tial strain, e. Ab-initio density functional theory (DFT). | |
Response coefficient fort he coupling between the electrode potential, E, and the tangential strain, e, of a <111>-textured gold electrode surface in aqueous NaF solution. At sufficiently high frequency, he experiment agrees with the DFT data. Insert shows equivalent circuit modelling the mechanically excited electrochemical double layer. |
