Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 17: Focus Session: Surfaces and Interfaces of (Incipient) Ferroelectrics (joint session O/KFM)

KFM 17.6: Topical Talk

Mittwoch, 7. September 2022, 16:45–17:15, H3

Water-oxidation catalysis on surfaces of ferroelectrics — •Ulrich Aschauer¹, Nathalie Vonrüti¹, Zhenyun Lan², Didrik R. Småbråten¹, Tejs Vegge², and Ivano E. Castelli² — ¹University of Bern, Bern, Switzerland — ²Technical University of Denmark, Kgs. Lyngby, Denmark

Surfaces of ferroelectrics have unique properties for catalysis since the binding strength of reaction intermediates can be modulated by switching the ferroelectric polarization. This could allow to overcome the limitations of the Sabatier principle and enable dynamical catalysts operation. In this talk, we will focus on the interplay between screening charge transfer to surfaces, the adsorbate coverage and the (photo)electrochemical water-oxidation activity of ferroelectric surfaces. We will compare different ferroelectric materials such as BaTiO₃, strained LaTiO₂N and the hexagonal improper ferroelectric oxynitride InSnO₂N. Our results indicate that ferroelectric switching can indeed provide an economically interesting route to enhance the catalytic activity but that material-specific intricacies of the surface adsorbate coverage need to be understood and controlled to exploit the full potential of ferroelectric switching in (photo)electrocatalysis.