Figure 10. (a) Fourier transformation of the EXAFS spectra at R
space for Ni/Fe-N-C, Ni-N-C, Ni-Pc, and Ni foil. (b) FECO of Ni/Fe-N-C,
Ni-N-C, Fe-N-C at various applied potentials. (c) The calculated free
energy diagrams for CO2 reduction to CO on different catalysts.
Reproduced with permission.[116] Copyright 2019,
Wiley-VCH. (d) Schematic illustration of the preparation process of
Ni7/Fe3-N-C samples. (e) Free energy
profiles on simulated models. Reproduced with
permission.[117] Copyright 2021, Royal Society of
Chemistry. (f) Atomic structure of dual metal 2N-bridged
(Fe-Ni)N6 sites embedded in a graphene layer. The gray,
blue, golden, and cyan balls represent C, N, Fe, and Ni atoms,
respectively. (g) Predicted free energy evolution on various dual metal
Fe-Ni sites. (h) Predicted limiting potential difference between ECR and
HER on various single-metal and dual-metal sites. Reproduced with
permission.[118] Copyright 2022, Wiley-VCH.