Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.055
Publication date: 11th July 2022
Cu is the only monometallic catalyst that can reduce CO producing a large variety of valuable compounds. However, the efficiency and selectivity towards specific products is highly affected by the structure properties of the catalyst and the composition of the electrolyte.[1]
Herein we have investigated the effect of the pH and the anion specifically adsorbed on the surface, on the structure and properties of the Cu(111) and Cu(100)-aqueous electrolyte interface.[2–4] Experiments under potential control were conducted on well-defined Cu single crystalline electrodes, and in presence of CO, to assess the electrolyte and surface orientation effect on the onset potential for the CO reduction.[3] We specifically used cyclic voltammetry in combination with other electrochemical approaches such as the CO displacement technique and laser induced temperature technique, in order to shed lights into the distribution of the surface charge and adsorbed electrolyte species across the whole potential window.[2–4] We experimentally showed that the structure of the Cu-electrolyte interface, at different pH and in presence of different anions, controls the onset potentials of the CO reduction. Lastly, we have investigated lead underpotential deposition to assess the different facets and domains in nanostructured copper, which is relevant to design more efficient electrocatalysts for the CO reduction. [5]
Figure 1 shows the cyclic voltammogram (CV) of Cu(111) in contact with 0.1 M phosphate buffer solution at pH 5 and in presence of CO, recorded at a short potential window (blue line) and long potential window (red line), 50mV/s.
Danish National Research Foundation Center for High Entropy Alloy Catalysis. DFF-Research Project1 (Thematic Research, green transition). Villum Foundation.
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