Publication date: 15th December 2025
(Electro-)catalytic processes are the pacemakers for energy conversion and storage technologies. A key prerequisite to control catalyst properties and performances in these processes is the detailed understanding of the reaction dynamics at solid-liquid and solid-gas interfaces during the reactions, calling for in-situ and operando studies.
Our approach exploits atomically-defined epitaxy of complex oxide catalysts to precisely tune material properties on the nanoscale and to tailor catalytic systems under controlled conditions. [1],[2] Recently, entirely new opportunities arise from delamination processes established for epitaxial complex oxides [3], yielding nanometer-thick oxide membranes with well-defined, single-crystalline structure. Being essentially transparent for electrons and x-rays, these membranes are prone to enable operando studies of complex oxide catalysts under atomically defined structural conditions.
In this talk, we will highlight implications for in-situ & operando x-rays spectroscopy (XAS/XPS) and electron microscopy, based on membrane transfer processes to SiNx-based (graphene-based) supports, allowing to study transient processes during catalyst activation and reaction conditions. We will explicitly discuss the transient processes during metal exsolution processes, yielding catalytic nanoparticles on complex oxide support.[4],[5] Further, we will discuss the electronic structure of perovskite-based oxygen evolution (OER) catalysts, evolving over time under repeated cycling in alkaline water spitting. As we elaborate, free-standing oxide transfer may offer a wide range of promising sample geometries to facilitate the in-depth understanding of catalyst activation and degradation processes.
This research was partly funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), project no. 493705276 as a part of the Priority Program SPP 2080 “Catalysts and reactors under dynamic conditions for energy storage and conversion.”
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