Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.292
Publication date: 22nd December 2022
Copper (Cu) is an excellent catalyst capable to convert CO2 beyond CO and produces fuels and hydrocarbons. However, it is low product-selective.(1) One strategy to improve product-selectivity on Cu is tuning the geometry of the surface active sites positions, i.e., the group of atoms in the catalyst surface that catalyse the CO2 conversion. In this communication, I show an easy and feasible strategy to tune and quantify the number and geometry of the surface active sites on Cu nanostructures. (2) At first, we have assessed the reversible adsorption/desorption of lead (Pb), or Pb under potential deposition (UPD), on different well-ordered Cu single facets (Figure 1). The lead adsorption/desorption on Cu, is monitored by a cyclic voltammetry technique (CV), which provides distinguishable peaks on each single facet, i.e., it is highly sensitive to the active site´s geometry (Figure 1). Then, we have nanostructured a Cu electrode using and electroplating method. We have recorded the Pb UPD on the nanostructured Cu surface, which voltammetric shape has several peak-contributions. Using the Pb UPD voltammetric data recorded on Cu single facets, we decouple the different facet contributions on our nanostructured Cu surfaces. This voltammetric analysis can be used to rationally design nanostructured copper catalysts with tailored geometry at the active sites positions, which is relevant to improve the CO2 reduction reaction.
Figure 1 shows the voltammetric Pb UPD profiles recorded on Cu single facets at pH 3 and from a 0.1 M KClO4 + 1mM NaCl solution.
We acknowledge the Villum Foundation for financial support through a Villum Young Investigator Grant (project number: 19142). We also acknowledge the Danish foundation for financial support through the DFF-Research Project1 (Thematic Research, green transition) grant with number: 0217-00213A;
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