Fig. 1: Characterization data for Cu2ONC-derived catalyst.
From: Selective electroreduction of acetylene to 1,3-butadiene on iodide-induced Cuδ+–Cu0 sites
a–e, SEM images of Cu2ONC catalyst (a), before (green background) and after e-C2H2R (pink background) in KI (b), K2SO4 (c), KCl (d) and KBr (e) electrolyte. f, Double-layer capacitance (Cdl) measurements of Cu2ONC-derived catalysts after e-C2H2R. The plots denote the capacitive current density versus scan rate. The Cdl was measured in 0.5 M K2SO4. Each error bar represents the standard deviation (s.d.) of three independent measurements. g, X-ray diffractograms of Cu2ONC catalyst before and after e-C2H2R at −1.0 V versus SHE in KI and K2SO4. The X-ray diffractograms were assigned in accordance with PDF 00-003-0892 for Cu2O and PDF 00-001-1242 for copper. h, In situ Raman spectra of Cu2ONC catalyst at OCP with C2H2, after 10 min of electrolysis at −1.0 V versus SHE in KI and K2SO4, and after electrolysis. Inset: enlarged region of the Cu2O Raman peaks under OCP conditions; the Raman spectra (i) and (ii) indicate the absence and presence of oxide peaks, respectively, during e-C2H2R in KI. A graphite disc was used as a substrate for characterization.
