Conference Presentation (Invited)

FZJ-2024-00430

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Friction Force Microscopy as a tool to investigate (electro)catalytic processes at surfaces

Maksumov, M.FZJ* ; Kaus, A. (Corresponding author)FZJ* ; Teng, Z. (Corresponding author)Extern* ; Gunkel, F. (Corresponding author)FZJ* ; Kleiner, K. (Corresponding author)Extern* ; Hausen, F. (Corresponding author)FZJ*RWTH*

2023

Abstract: Friction Force Microscopy as a tool to investigate (electro)catalyticprocesses at surfacesM.Maksumov1,2, A. Kaus2,3, Z. Teng4, K. Kleiner4, F. Gunkel3, F. Hausen1,21Forschungszentrum Jülich, IEK-9, 52428 Jülich, Germany2RWTH Aachen University, IPC, Landoltweg 2, 52065 Aachen, Germany3Forschungszentrum Jülich, PGI-7, 52428 Jülich, Germany4University of Münster, MEET, Correnstraße 46, 48149 Münster, Germanym.maksumov@fz-juelich.def.hausen@fz-juelich.deA thorough understanding of (electro)catalytic surface transformations under dynamic reaction conditions is of utmost importance for a knowledge-based catalyst design. Friction Force Microscopy (FFM) as an atomic force microscopy based technique is capable to obtain materials specific information in addition to electrical and structural properties of catalysts in liquid media and under electrochemical conditions. This is especially relevant as surface transitions at early catalytic activity are subtle and might be easily overseen by pure topography mapping.It is the objective of this work to demonstrate the capabilities of FFM for investigating (electro)catalysts. It has been shown earlier that the frictional behavior of a bare metal differs significantly from its oxy/hydroxy-terminated surface under electrochemical conditions.The new results on combined electrochemical and frictional experiments on well-defined epitaxial perovskite oxide structures in aqueous liquids are illustrated. This approach represents the first application of these technique with respect to (electro)catalysis. Simultaneously recorded cyclic voltammograms and lateral forces, so-called frictograms, allow to correlate subtle and local surface transformations and the applied potential precisely.In conclusion, FFM represents a versatile new operando technique to investigate (electro)catalytic reactions under dynamic conditions on a local scale with high sensitivity to materials and structural changes.

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)
2. Elektronische Materialien (PGI-7)

Research Program(s):

1. 1223 - Batteries in Application (POF4-122) (POF4-122)
2. DFG project 493705276 - Kontrolle des Degradationsverhaltens von perowskitischen OER-Katalysatoren unter dynamischen Operationsbedingungen durch operando-Charakterisierung und systematischer Variation der d-Orbital-Bandstruktur (493705276) (493705276)

Appears in the scientific report 2023

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