Table 1.

Activation energies $E_{\mathrm{act}}$ and estimated activation energies $E_{\mathrm{act},\mathrm{e}}$ for the Volmer, Tafel, and Heyrovský step at the Mg(0001) surface.

	$E_{\mathrm{act}}$/eV	$\nu$/THz	k/${\text{s}}^{-1}$	$E_{\mathrm{act},\mathrm{e}}$/eV
Volmer	0.66	14.9	$1.1\times {10}^{+2}$	0.90
Tafel	1.26	86.7	$4.8\times {10}^{-8}$	0.94
Heyrovský	0.28	0.9	$1.4\times {10}^{+7}$	0.82

Values for $E_{\mathrm{act},\mathrm{e}}$ are based on the experimental exchange current density $i_{0,\mathrm{HER}}=4\times {10}^{-6}\mathrm{A}{\mathrm{cm}}^{-2}$, the calculated prefactor $\nu$ and the reaction rate k.