Starting with the abstract, we gleaned data about the metallic elements most used in catalysts for CO 2 RR. We selected this section as its sentences tend to be shorter, direct (without comparison with the literature), and positive (mentioning the materials used rather than those not used). We determined the top 10 most common metal elements employed by the number of articles, i.e., how many articles mentioned a catalyst based on that element. It is important to note that, for each element, we only considered whether it was present or not in the abstract but not the frequency it appeared; thereby, if an element was mentioned ten times within a single abstract, it would only be counted once. Additionally, aiming to capture only elements in catalysts, we discarded any composition after the symbols "@", "/", and "-", or mentioned after the prepositions "on" and "at", so these results do not account for elements used in supports.