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001020971 037__ $$aFZJ-2024-00431
001020971 041__ $$aEnglish
001020971 1001_ $$0P:(DE-Juel1)194153$$aMaksumov, Muzaffar$$b0
001020971 1112_ $$aNorthEastern Regional Meeting 2023/NESACS$$cBoston$$d2023-06-14 - 2023-06-17$$gNERM 2023$$wUSA
001020971 245__ $$aFriction Force Microscopy as a tool to investigate (electro)catalytic activities at surfaces
001020971 260__ $$c2023
001020971 3367_ $$033$$2EndNote$$aConference Paper
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001020971 520__ $$aProduction of green hydrogen energy based on water electrolysis, currently, have become one of the crucial topics in the framework of energy transition towards green energy technologies. In water splitting electrolysis catalysis or electrocatalysts play a critical role, where the development of active, stable and low-cost electrocatalysts is always on the agenda of the research works. [1] Designing of electrocatalysts with fundamental understanding of their surface transformations under dynamic reaction conditions still remains very challenging. This requires a fundamental understanding of all the processes involved on the atomic level, which is the main focus of my research work and part of the common goals of DFG Priority Programme 2080. The slow reaction kinetics at oxygen evolution reaction (OER) due to high overpotentials keep electrolysis from being of practical use and perovskites, as catalysts, could be used to minimize the overpotentials. However, perovskite electrocatalysts suffer from irreversible degradation reactions such as undesired surface transformations and morphology changes at grain boundaries and surfaces. [2-3] A comprehensive understanding of perovskite surface transformations under dynamic OER conditions at atomic level could be achieved by implementation of different electrochemical scanning probe microscopy techniques. Mainly, to investigate fundamental processes at the solid/liquid interface in electrocatalysis advanced atomic force microscopy (AFM) and scanning tunneling microscopy (STM) are employed in liquid environment under applied voltage bias. AFM enables the collection of data regarding the nanomechanical, electrical, and structural properties of sample in addition to the standard topography map that is captured. This is highly valuable considering sole topography mapping likely to miss the expected surface changes at the beginning of the OER. Previously, F. Hausen et al [4] applying a common tribology method based on AFM, operando electrochemical friction force microscopy (EC-AFM), reported that friction differences between a bare metal and and oxy/hydroxy-terminated surface in liquid environment clearly indicates direct fingerprint of chemical surface transformation. In our work, we investigate exclusively epitaxially grown perovskite oxide catalysts based on La1-xSrxCoO3 in alkali environment before and after electrocatalysis under dynamic and steady state operation conditions (as illustrated in Fig.1). Figure 1 clearly illustrates the difference of surface between as-grown perovskite oxide with the higher average friction of 18-20 nN than the post-catalaysis perovskite oxide with the average friction of 10-12 nN. The relevance of this research work and necessity to exchange the ideas with researchers around the world working on hydrogen energy technologies is highly encouraged from SPP2080 project as well as well aligned within the scope of H2Educate program from National Energy Education Development (NEED Project, US), which was designed to promote young researchers with educational materials, training and exchange programs.  Figure 1. Friction maps of as-grown and post-catalysis of LaxSr1-xCoO3 in air, a and b respectively.1.	Wang S., Lu A., Zhong CJ. Hydrogen production from water electrolysis: role of catalysts. Nano Convergence 8, 4 (2021). 2.	Grimaud, A. et al. Double perovskites as a family of highly active catalysts for oxygen evolution in alkaline solution. Nat. Commun. 4, 2439 (2013).3.	Wan, G. et al. Amorphization mechanism of SrIO3 electrocatalyst: How oxygen redox initiates ionic diffusion and structural reorganization. 4.	Hausen, F. et al. Anion adsorption and atomic friction on Au (111). Electrochimica Acta. 56, 28, 10694-10700 (2011).
001020971 536__ $$0G:(DE-HGF)POF4-1223$$a1223 - Batteries in Application (POF4-122)$$cPOF4-122$$fPOF IV$$x0
001020971 536__ $$0G:(GEPRIS)493705276$$aDFG project 493705276 - Kontrolle des Degradationsverhaltens von perowskitischen OER-Katalysatoren unter dynamischen Operationsbedingungen durch operando-Charakterisierung und systematischer Variation der d-Orbital-Bandstruktur (493705276)$$c493705276$$x1
001020971 7001_ $$0P:(DE-Juel1)188202$$aKaus, Anton$$b1$$eCorresponding author
001020971 7001_ $$0P:(DE-HGF)0$$aTeng, Zhenjie$$b2$$eCorresponding author
001020971 7001_ $$0P:(DE-HGF)0$$aKleiner, Karin$$b3$$eCorresponding author
001020971 7001_ $$0P:(DE-Juel1)130677$$aGunkel, Felix$$b4$$eCorresponding author
001020971 7001_ $$0P:(DE-Juel1)167581$$aHausen, Florian$$b5$$eCorresponding author$$ufzj
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001020971 9141_ $$y2023
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001020971 9201_ $$0I:(DE-Juel1)IEK-9-20110218$$kIEK-9$$lGrundlagen der Elektrochemie$$x0
001020971 9201_ $$0I:(DE-Juel1)PGI-7-20110106$$kPGI-7$$lElektronische Materialien$$x1
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