as a function of RHE potential. For atomic visualizations of the most stable adsorbate combination at potentials 0.0, -0. of the adsorbate combination, with it making CO, HCOOH, and/or H 2 CO 3 . As the adsorbates are no longer on the surface, these results are not usable for this analysis and only results up to 2/3 ML *H coverage are shown here. Including higher *H coverage does not change the trends.