RESEARCH / A0221
Interface‐Regulated Orbital Coupling Enables Nucleophilic Carbon Assembly Pathways in Electrochemical CO2 Conversion
Read the original paper · 10.1002/ange.202525739 ↗
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 2. Structural characterization of electrocatalysts. Aberration-corrected HAADF-STEM image of a) Zn SACs-NC and b) Zn SACs-Cu2O-NC, with Zn single atoms and Cu2O nanoparticles marked by red and green circles, respectively. c) 3D topographic atom image. d) Zn K-edge XANES spectra and e) Fourier transformation of the EXAFS spectra in R space for Zn SACs─Cu2O─N─C, ZnO and Zn foil. f) Corresponding EXAFS R space-fitting curves for Zn SACs-Cu2O-N-C. WT-EXAFS plot for g) Zn foil, h) Zn SACs─Cu2O─N─C and i) ZnO.
Figure 4. In situ characterization of Zn SACs─Cu2O─NC in electrocatalytic CO2 reduction. a) Zn K-edge X-ray absorption near-edge spectroscopy was measured for a reference sample and Zn SACs─Cu2O-NC samples in different states. b) Dynamic local structural behavior of Zn species before, after CO2RR reaction and at -0.9 V versus RHE. c) Cu K-edge X-ray absorption near-edge spectroscopy was measured for a reference sample and Zn SACs─Cu2O─NC samples in different states. d) Dynamic local structural behavior of Cu species before, after CO2RR reaction and at -0.9 V versus RHE. WT-EXAFS plot for e) Cu2O, Zn SACs-Cu2O─NC at f) ocp, g) −0.9 V versus RHE and h) after CO2RR. i) In situ Raman test spectra of Zn SACs-Cu2O─NC at -0.9 V versus RHE. j) Potential-dependent ATR-FTIR spectra of Zn SACs-Cu2O-NC.