Fig. 2
From: Catalysis-Hub.org, an open electronic structure database for surface reactions

Overview of the contents of the Surface Reactions database. (a) Fifteen most occurring surface compositions for the reactions. Although pure, noble metals are most prevalent when counting by unique surface composition, the database is overall dominated by a large diversity of metallic alloys and oxides. (b) Fifteen most prevalent adsorbates taking part in reactions, with occurrence shown on a log scale.