Tailored electrochemical interfaces for CO2 electrocatalysis
Maria Escudero-Escribano a
a University of Copenhagen, -, copenhaguen, 0, Denmark
Invited Speaker, Maria Escudero-Escribano, presentation 021
Publication date: 7th June 2020

Tailoring the structure of the electrochemical interface at the atomic and molecular levels can provide very valuable insight to understand and tune the electrocatalytic activity and/or selectivity of renewable energy conversion reactions. Model studies on well-defined interfaces are pivotal to understand the factors controlling both activity and selectivity in electrocatalysis.

The use of renewable electricity to reduce CO2 into clean fuels and chemicals is very promising to convert CO2 into valuable hydrocarbons and alcohols while contributing to close the unbalanced carbon cycle [1,2]. This presentation will summarise some recent strategies aiming to understand the structure-activity-selectivity relations for CO2 and CO electrocatalysis [1]. We have investigated the interfacial properties of Cu single-crystalline electrodes in contact with different electrolytes. We have studied the effect of pH, specific anion adsorption, and potential dependence of interfacial processes on Cu single-crystalline surfaces for CO electroreduction [3]. In phosphate buffer solutions, the adsorption of phosphate anions depends strongly on both the pH and the geometry of the active site. In the presence of CO, phosphate adsorption affects the potential range at which CO poisons the surface. We show how well-defined studies, under potential control, are essential to understand the structure-function relations and, ultimately, to rationally design highly efficient electrocatalysts for CO2 reduction.

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