SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 30: Mini-Symposium: Electrified solid-liquid interfaces I

O 30.2: Hauptvortrag

Dienstag, 2. März 2021, 11:10–11:45, R1

Dynamic Evolution of CO₂ Electroreduction Catalysts — •Beatriz Roldan Cuenya — Department of Interface Science, Fritz Haber Institute of the Max Planck Society, Berlin, Germany

Tailoring the chemical reactivity of nanomaterials at the atomic level is one of the most important challenges in catalysis research. In order to achieve this elusive goal, we must first obtain a fundamental understanding of the structural and chemical properties of these complex systems. In addition, the dynamic nature of the nanostructured films and nanoparticle (NP) catalysts and their response to the environment must be taken into consideration. To address the complexity of real-world electrocatalysts, a synergistic approach taking advantage of a variety of cutting-edge experimental methods (EC-AFM, LC-TEM, XPS, XAFS, Raman Spect., GC) has been undertaken.

This talk will provide insight into the electrocatalytic reduction of CO₂ and will feature the parameters that determine the reaction’s selectivity. Important aspects that will be discussed are: (i) the design of size- and shape-controlled catalytically active nanoparticles (Cu, Zn, Cu-Zn, Cu-Ag) (ii) the role of the NP size and shape on the catalytic activity and selectivity, (iii) the evolution of the structure and composition of the electrocatalysts under operando reaction conditions and their influence on the catalytic performance, (iv) the possibility of using pulsed-electrolysis to tune the reaction selectivity. These findings are expected to open up new routes for the reutilization of CO₂ through its direct conversion into valuable chemicals and fuels such as ethylene and ethanol.