To aid in this selection process, people have leveraged two classes of linear scaling relationships. The first linear relationship, the Bell-Evans-Polanyi (BEP) principle, dates back to when Evans and Polanyi (1935, 1936) posited from empirical observations that linear relationships exist between free energies and activation energies for classes of similar reactions. The BEP principle has been extended to various transition metal surface reactions using density functional theory (DFT) calculations. For instance, Pallassana and Neurock (2000) demonstrated linear relationships between activation energies and reaction energies, as well as between activation energies and binding energies in CH bond breaking. Further work by Nørskov et al. (2002) revealed a universal linear trend between binding energies and activation energies for several types of dissociation reactions. A second class of linear relationships was proposed by Abild-Pedersen et al. (2007), who showed that the binding energies of CH x , NH x , OH x , and SH x species on various closed-packed and stepped surfaces correlate linearly with the corresponding binding energies of C, N, O, and S atoms, respectively. A similar analysis by Jones et al. (2011) demonstrated that several C2 species on close-packed and stepped surfaces obey these linear trends well. Kolb et al. (2021) focused on closed-pack surfaces only and also observed linear scaling relationships between the binding energies of C and CH x species. Such scaling relations have been rationalized using a d-band model through a separation of sp-and delectron contributions to the binding energy. Specifically, the spelectron contribution is expected to remain constant for a surface made of different transition metals, while the d-electron contribution is deemed the major factor underneath the scaling relations.