RESEARCH / A0481
Origin of Metal–Support Interactions for Selective Electrochemical CO2 Reduction into C1 and C2+ Products
Read the original paper · 10.1021/acscatal.4c02335 ↗
Source figures may contain other techniques and soft X-ray spectra. C, N and O measurements are outside our current hard-XAFS testing range.
Figure 3. (Quasi) In situ characterization of catalyst composition evaluated during and after CO2RR measurements. (a) In situ Cu K-edge XANES spectra of Cu2O, Cu2O−CeO2-w, and Cu2O−CeO2-s catalysts during CO2RR. The symbols mark the characteristic features for the reference Cu foil (●), Cu2O (▼), and CuO (◆) samples. (b) The corresponding EXAFS R-space spectra of three catalysts at −1.1 V (vs RHE) and reference catalysts. The inset shows the intensity of Cu−O and Cu−Cu bonds of these three samples. (c) Quasi in situ XPS measurements of Cu LMM Auger and Ce 3d spectra (d) of the catalysts after CO2RR. (e) Schematic of the structural transformation of Cu2O−CeO2-w and Cu2O−CeO2-s during CO2RR process and the Cu+ ratio of three catalysts under operational conditions measured by in situ XAS and quasi in situ XPS.