Figure 2
From: High efficiency carbon nanotubes-based single-atom catalysts for nitrogen reduction
(a) The variation of N\(\equiv\)N bond lengths of N2 molecules adsorbed on FeN3@(n, 0) CNTs; (b) The adsorption energies of N2, the Gibbs free energy changes for the formation of *N2H and *NH3 in the N2 reduction reactions catalyzed by FeN3@(n, 0) CNTs (N2 adsorption mode is end-on).
