Fig. 3: Structural characterization of 2D-FeCu–N–C and FePc@2D-Cu–N–C.
From: Spatial engineering of single-atom Fe adjacent to Cu-assisted nanozymes for biomimetic O2 activation
a XPS spectra of FePc, 2D-Cu–N–C, 2D-FeCu–N–C, and FePc@2D-Cu–N–C catalysts in the N 1 s regions. b, c The Fourier transformed magnitude of the k3-weighted EXAFS spectra of the Fe K-edge (b) and Cu K-edge (c) of FePc, 2D-Cu–N–C, 2D-FeCu–N–C, FePc@2D-Cu–N–C, and the corresponding reference samples. d, e Fe K-edge (d) and Cu K-edge (e) EXAFS experimental results (open circles) and theoretical fits (solid lines) of 2D-FeCu–N–C and FePc@2D-Cu–N–C in R space (Inset: the corresponding optimized configuration). f 57Fe Mössbauer spectrum of FePc@2D-Cu–N–C showing the contributions from three Fe species, D1–D3. g, h Normalized Fe K-edge (g) and Cu K-edge (h) XANES spectra of various catalysts with the corresponding reference compounds. Insets are the magnified corresponding pre-edge regions. Source data are provided as a Source Data file.
