Initially, we focused on extracting information regarding metallic elements most employed in catalysts for CO 2 reduction reaction from abstracts of the papers in our corpus. By using a set of regular expressions to identify elements and clean the sentences, we selected the top 10 most frequent metals, depicted in Figure (a). We remember here these results account for materials solely employed in catalysts but not in supports. It can be seen that Cu and Ti are the most common elements encountered. Copper is widely recognized as a highly promising material for electrochemically converting carbon dioxide into hydrocarbons and alcohols , while titanium serves as a reference material for CO 2 photo-reduction . Additionally, we observed significant counts for Ni, Ag, and Bi. These elements are also frequently employed in carbon dioxide reduction both in the electrochemical and photochemical approaches. Nevertheless, it is riveting to note the growing trends in Bi-based catalysts in this field.