SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 96: Solid-Liquid Interfaces III: Reactions and Electrochemistry II
O 96.7: Vortrag
Freitag, 31. März 2023, 12:00–12:15, TRE Phy
Shaping the electrochemical interfaces of high-performance photoelectrodes by dedicated corrosion — •Matthias M. May1,2, Erica A. Schmitt1,2, Margot Guidat1,2, Mario Löw2, Anna-Lena Renz1, Marco Flieg1, Max Nusshör1, Vibhav Yadav1, Jongmin Kim1, and Moritz Kölbach1 — 1Universität Tübingen, Institute of Physical and Theoretical Chemistry, Tübingen, Germany — 2Universität Ulm, Institute of Theoretical Chemistry, Ulm, Germany
Photoelectrodes for highly efficient solar water splitting often involve III-V semiconductors, which exhibit only a limited stability under operating conditions due to (electro)chemical corrosion. Yet photoelectrochemical in situ functionalisation, which also involves dedicated corrosion, can effectively create an interphase that passivates the solid-liquid interface in a similar manner as solid-electrolyte interphases in batteries [1].
We show how this approach can be used to also electronically passivate III-V/Si dual junction photoelectrodes. A full understanding of the underlying photoelectrochemistry is, however, not yet achieved. To improve this understanding, we study the structural evolution of the interface in the electrolyte, using operando reflection anisotropy [2], improving the control of functionalisation and catalyst photoelectrodeposition.
[1] May and Jaegermann, Curr. Opin. Electrochem. 34 (2022) DOI:10.1016/j.coelec.2022.100968. [2] Löw et al., RSC Adv. 12 (2022) DOI:10.1039/D2RA05159A.