Fig. 3: X-ray absorption analysis of Pd-doped Cu electrocatalysts.
From: Enhanced multi-carbon alcohol electroproduction from CO via modulated hydrogen adsorption
a A plot of XAFS spectra at a relative energy scale for the Pd K-edge and Cu K-edge of Pd foil, CuPd0.007, CuPd0.011 and Cu foil by subtracting the Pd K-edge and Cu K-edge photon energies (E) with the absorption thresholds (E0) of Pd 1 s (24350 eV) and Cu 1 s (8979 eV), respectively, i.e. ΔE = E – E0. b Pd K-edge EXAFS spectra as well as corresponding fitting spectra of Pd foil (bottom), CuPd0.007 (middle) and CuPd0.011 (top), recorded at a radial distance scale. c, d Simulated coordination number (c) and bond distance (d) of CuPd0.007 (left) and CuPd0.011 (right) extracted from their Pd K-edge EXAFS. Cu K-edge XAS was performed in operando mode during COR at −0.62 V vs. RHE in 1 M KOH, whereas ex-situ Pd K-edge was conducted after COR at −0.62 V vs. RHE in 1 M KOH.
