Fig. 4: In-situ capture of reaction intermediates. | Nature Communications

Fig. 4: In-situ capture of reaction intermediates.

From: Manipulating C-C coupling pathway in electrochemical CO2 reduction for selective ethylene and ethanol production over single-atom alloy catalyst

Fig. 4: In-situ capture of reaction intermediates.

Operando Raman spectra recorded in CO2-saturated 0.1 M KHCO3 solution at E = -0.6 V ~ -1.4 V vs. RHE over (a) AgCu NW and (b) Ag1Cu NW, respectively. c Potential-dependent Raman peak intensity ratio of Cu-CO stretching (P2) to Cu-CO frustrated rotation (P1) over AgCu NW and Ag1Cu NW, and peak intensity of *OH species versus potential over Ag1Cu NW. d, e Operando ATR-SEIRAS spectra collected in CO2-saturated 0.1 M KHCO3 solution at E = -0.4 V ~ −1.6 V vs. RHE over AgCu NW and Ag1Cu NW, respectively. The inset in Fig. 4c, d and e shows the DFT-optimized structures. (Cu: yellow, Ag: gray, O: red, H: white, C: black gray) f Potential-dependent ATR-SEIRAS peak intensity for *COCHO intermediate over Ag1Cu NW (blue bar) and *COCO intermediate over AgCu NW (black solid line). h 13C NMR and i MS spectra of CO2RR products over Ag1Cu NW, using 12CO + H12CHO (top), 13CO + H12CHO (middle), or 12CO + H13CHO (bottom) as the reactants, obtained at −1.2 V vs. RHE. g Schematic diagram showing the CO2RR pathway over Ag1Cu NW.

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