Figure 5.

MOF-derived SACs with external Fe SAs

(A) Fe K-edge XANES spectra of Fe³⁺-N-C, Fe₂O₃, Fe³⁺TPPCl, FeO, and Fe foil.

(B) R-space Fe K-edge EXAFS spectra.

(C and D) Fe K-edge XANES spectra (left) and the first derivative of the spectra (right) of Fe³⁺-N-C (C) and Fe²⁺-N-C (D) as dry powder (black) and loaded on glassy carbon electrodes at open circuit potential (OCP) (blue), −0.1 to −0.6 V versus RHE, with the spectra of Fe₂O₃, Fe³⁺TPPCl, FeO, and Fe foil as references.

(A–D) Reproduced with permission.³⁸ Copyright 2019, American Association for the Advancement of Science.