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O: Fachverband Oberflächenphysik
O 60: Solid-Liquid Interfaces I: Structure and Spectroscopy
O 60.10: Talk
Wednesday, March 29, 2023, 17:15–17:30, TRE Phy
Electrochemical re-structuring of the InP(100)-HCl interface monitored by operando reflection anisotropy spectroscopy — •Margot Guidat1,2, Mario Löw2, Daniel Lörch1, Vibhav Yadav1, Jongmin Kim1,2, and Matthias M. May1,2 — 1Institute of Physical and Theoretical Chemistry, Universität Tübingen, Germany — 2Institute of Theoretical Chemistry, Universität Ulm, Germany
A possible way to achieve a low-carbon energy system consists of hydrogen production by photoelectrochemical water splitting. Here, III-V semiconductors play an important role due to their high solar-to-hydrogen efficiencies. However, surface corrosion limits the overall performance of photoelectrochemical devices. Studies have reported that interface functionalization is a way to protect the surface. In this work, we monitor the potential-dependent restructuring of the electrochemical InP(100) interface in HCl by operando reflection anisotropy spectroscopy (RAS) [1]. We investigate the effect of electrolyte concentration on the ordering and stabilization of the surface film formed at cathodic potentials. Computational RAS qualitatively supports the formation of an InClx layer. The latter is further investigated quantitatively with other characterization techniques. Fitting RA-transients measured under applied potentials with adsorption isotherm models gives insight into the lifetime of the involved processes and their adsorption energies. [1] Löw, M.; Guidat, M.; Kim, J.; May, M. M. RSC Adv. 2022, 12 (50), 32756-32764.