Additionally, we explored the composition of materials employed in CO 2 RR. Using the same regular expressions to match elements and specific rules to avoid wrong extractions, we determined how elements co-occur in binary and ternary compounds. We selected the most prominent results from each category and search for these materials in reviews in the literature regarding this topic. In cases we did not encounter any discussion about the compositions identified in the checked review articles, we analyzed the sentences extracted in order to gain some insights on the application of these materials in carbon dioxide reduction. Finally, we investigated how the number of publications about these materials has changed over the years. Applying this strategy we were able to identify promising structures that only recently have gained attention in the literature regarding CO 2 RR.