Figure 5
From: High efficiency carbon nanotubes-based single-atom catalysts for nitrogen reduction
Gibbs free energy profiles for NRR via (a) distal; (b) alternating; (c) enzymatic pathways at different applied potentials. PDS is labeled in each Gibbs free energy profile. In the symbols depicting the intermediates, the N atom with “*” on its left means that it is adsorbed on the metal atom of the catalyst, and “NxHy” represents the formula of the intermediate. The illustrations show the structures of N2 molecules adsorbed on the catalyst surface. (d) The variation of N–N and Tc–N bond lengths via distal pathway.
