fig1

Figure 1. (A) Preparation process of Ax-Cl-Cu/NC, HAADF-STEM of (B) Cu/NC and (C) Ax-Cl-Cu/NC, (D) TEM-EDS mapping image of Cu/NC and Ax-Cl-Cu/NC (green, yellow, blue and white represent C, N, Cu and Cl elements), (E) FT-EXAFS spectra of the Cu K-edge for Ax-Cl-Cu/NC and Cu/NC and fitting spectra of Cu/NC. The inset shows Cl, Cu, and N atoms indicated by purple, gold and blue.