NSRRC Activity Report 2023

Chemical Science 031 Fig. 2 : (a) Wavelet-transform diagram of in situ Cu K-edge EXAFS spectra of N–Cu SAC at various applied potentials in CO 2 -saturated 0.1M KHCO 3 solution during CO 2 reduction. (b) Extracted oxidation state from in-situ Cu K-edge XANES spectra of N–Cu SAC through linear combination of Cu foil, Cu 2 O, and Cu(bipy) 4 Cl as spectroscopic references in CO 2 -saturated 0.1M KHCO 3 solution. (c) Quantitative analysis of the coordination environment extracted from EXAFS fitted at various potentials in CO 2 -saturated 0.1M KHCO 3 solution. (d) Schematic representation of in situ XES apparatus applied to a liquid electrochemical cell and energy diagram for the detection of Kα 1 and Kα 2 emission in transition-metal ion. (e) In situ XES spectra of Kα 1 and Kα 2 emission for N–Cu SAC and references collected at various potentials during CO 2 reduction in CO 2 -saturated 0.1M KHCO 3 solution. [Reproduced from Ref. 2]