Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.171
Publication date: 7th February 2022
While the performance of catalysts for electrochemical CO2 reduction reaction (CO2RR) strongly depends on the nature of electrode-electrolyte interfaces, it remains a key challenge to spatially resolve interfacial physical-chemical properties under liquid phase reaction conditions. In this talk, recent advances in electrochemical atomic force microscopy (EC-AFM) to decipher in situ an electrocatalyst’s morphology, structure and reaction-rate determining local charge transfer variations will be discussed. Selected results include deciphering the potential-dependent morphology of copper-based electrodes during CO2RR. Distinct surface morphologies are revealed for a copper(100) electrode over wide potential ranges upon electrode exposure to electrolytes and during CO2RR, which can be understood by surface mobility and specific adsorption. Decisively different behavior of copper electrocatalysts in the presence of halides compared to plain electrolytes is observed. Conductive AFM will be demonstrated as a correlative tool for revealing simultaneously the nanoscale electric current, morphology and friction force of electrocatalysts in relevant aqueous electrolytes. The broader relevance of implemented in situ EC-AFM methods will be discussed in the context of establishing reliable structure-property relationships for the rational design of advanced catalysts and electrochemical interfaces.
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