Fig. 1: Structural characterization of the Cu92Sb5Pd3 catalyst.
From: Turning copper into an efficient and stable CO evolution catalyst beyond noble metals
a HAADF-STEM image and STEM-EDS mapping of Cu, Sb and Pd of the Cu92Sb5Pd3 catalyst. The yellow circles highlight single Sb/Pd atoms, one of which was magnified into a 3D structure. Note that since the atomic numbers of Sb and Pd are quite close, HAADF-STEM failed to differentiate them. b, c Ex situ EXAFS spectra at the Sb and Pd K-edge of the Cu92Sb5Pd3 catalyst, respectively. The spectra of Sb and Pd foil are shown as references. d EXAFS wavelet transforms for the Sb and Pd K-edge of the Cu92Sb5Pd3 catalyst. Sb and Pd foil are shown as references. e Operando Cu K-edge XAFS spectra of the Cu92Sb5Pd3 catalyst under applied potentials during the CO2RR. Cu foil is shown as a reference. All potentials were calibrated to the RHE scale.
