fig7

Figure 7. In-situ XANES spectra for OER catalyzed by CrMnFeCoNi-(CrO_x)₁/NC at (A) Cr K-edge, (B) Mn K-edge, (C) Fe K-edge, (D) Co K-edge, and (E) Ni K-edge. Corresponding EXAFS spectra in R space (k=2): (F) Cr K-edge, (G) Mn K-edge, (H) Fe K-edge, (I) Co K-edge, and (J) Ni K-edge; (K) In-situ Raman spectra of OER catalyzed by CrMnFeCoNi-(CrO_x)₁/NC. XANES: X-ray absorption near edge structure; OER: oxygen evolution reaction; EXAFS: extended X-ray absorption fine structure.