Now we move to calculating the Volmer barrier under dynamic conditions. The collective variable (CV) selected was a standard distance difference commonly used for bond-breaking reactions. This CV configuration is illustrated in Figure . To account for the homogeneity of the metal surface, only the z-component of Ni-H distance was used, and that distance was assigned to the entire surface. Attention was paid to picking H2O molecules that form chains like those modeled in the previous section, although it was observed during sampling that such features are formed upon reaction regardless.