The surface free energies can be used to construct phase diagrams and compare the stability of materials for catalytic and electrocatalytic systems under specific reaction conditions . However, they may also be related to specific reaction conditions such as temperatures, environment, applied potentials, or pH. In the cases where the chemical potential is evaluated at different temperatures than 0 K, it is necessary to work with the Gibbs free energy of formation in Eq. ( ) and consider finite temperature and other corrections. An example is the computational hydrogen electrode (CHE), which also uses the concept of elemental chemical potentials . For electrocatalytic systems, an additional reference potential is required for the proton-electron pair, defined as the reversible hydrogen electrode (RHE).