Fig. 2: XPS and XAS characterizations of the catalysts. | Nature Communications

Fig. 2: XPS and XAS characterizations of the catalysts.

From: Orbital coupling of hetero-diatomic nickel-iron site for bifunctional electrocatalysis of CO2 reduction and oxygen evolution

Fig. 2

a High-resolution XPS spectra of N 1s. b Ni K-edge XANES spectra. c Fe K-edge XANES spectra. Peak A, B, C, D in b and c represent 1s → 3d transition, 1s → 4pz transition, 1s → 4px,y transition and multiple scattering processes, respectively. Insets of b and c are the first derivatives of Ni and Fe K-edge of XANES spectra, respectively. Fourier transformation (FT)-EXAFS spectra of d Ni-SAC and NiFe-DASC, e Fe-SAC and NiFe-DASC. Wavelet transform (WT)-EXAFS of k2-weighted k-space spectra of Ni for f Ni-SAC and g NiFe-DSAC, of Fe for h Fe-SAC and i NiFe-DSAC.

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