Regensburg 2022 – wissenschaftliches Programm
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.