It is important to note the above phenological model is very similar in spirit to the bond-additivity model of Singh et al. , which also accounts for the effect of the competitive water adsorption. In that case, the authors primarily make use of experimentally measured surface energies and adhesion energies, along with simpler approaches for molecular areas, coupled with an implicit assumption of planar adsorption. Nonetheless, our current model clearly retains many of these core elements. More generally, Jeng and coworkers previously developed a detailed thermodynamic model to predict the adsorption isotherm of organic adsorbates on Pt electrodes, incorporating the role of competitive water adsorption on their experimentally-measured adsorption energies. Given that their model is intended to predict coverage (and not simply adsorption energy), they also include terms to attempt to account for adsorbate-adsorbate interactions, as well as surface heterogeneity. In contrast, the present model is far simpler, but also more general, and employs parameters that are straightforward to calculate from standard continuum DFT calculations.