Here, 𝑘 > , ℎ are the Boltzmann and Planck constants, 𝑝 , ! is the nitrogen pressure (taken to be 1 bar), 𝜃 * is the coverage of free sites on the surface (approximated as 1), and Δ𝐺 -,, ! 01&&2+. is the Gibbs free energy of N2 acUvaUon. For T = 300K, we calculate a corresponding Δ𝐸 , of approximately -0.6 eV, forming the verUcal red line in Figure and enclosing the green box, which denotes viable candidates for mediators for this process. Note that all materials in Figure saUsfy criUeria (i), i.e., they all spontaneously form nitrides in the presence of N2; however, criteria (v), existence of salts soluble in nonaqueous electrolyte, is not addressed.