Fig. 4: Isotope-labeling MS measurement results under different systems.
From: Water coordinated on Cu(I)-based catalysts is the oxygen source in CO2 reduction to CO
a [63Cu(H216O)]+ and C16O2. b [63Cu(H216O)]+, H216O, and C16O2. c [63Cu(H216O)]+, H218O, and C16O2. d [63Cu(H216O)]+ and C18O2. e [63Cu(H216O)]+. H216O, and C18O2; f [63Cu(H216O)]+, H218O and C18O2 (gas circuit temperature: 280 oC; reaction pressure: 1.5 mTorr).
