Fig. 3: Mechanistic insight.
Time-depend in-situ Cu k-edge (A) FT EXFAS spectra and (B) XANES spectra during the formation of Cu-Pd SAA and EAE process (the green and blue dash line indicates the position of the Cu-N and Cu-Cu bonding in Fig. 3A, respectively. And the purple dash line represents electrolysis in C2H2 environment). C, D Potential-depend in-situ Raman spectra (the blue and red dash line indicate the characteristic Raman band of ethylene and acetylene, respectively. The black dash lines represent the signals of polyacetylene). E Adsorption energy of C2H2 and H2O. F Kinetic isotope effect, KIE, the maximum measurement error is ±3.7% (s. d.). G Time-depend in-situ Raman spectra of Cu-Pd SAA in EAE. H Nyquist plots measured at −0.4 V vs. RHE, inset: the fitting circuit and R2 value (the Ru of Cu-Pd, Cu-Ru, Cu-Pt, Cu-Ag and Cu NP is 1.33 ± 0.10 Ω, 1.32 ± 0.13 Ω, 1.30 ± 0.25 Ω, 1.31 ± 0.22 Ω, 1.33 ± 0.16 Ω, respectively). I The energy variation for H* transferring on the surface of Pd atom doped Cu (111) at 0 V. J Free energy diagram for the hydrogenation of C2H2 at 0 V. Error bars correspond to the s. d. of three independent measurements. The results are presented without iR compensation.
