Fig. 1: In situ Raman spectra of OD-Cu electrodes in CO2-saturated 0.5 M KHCO3.
From: Hydroxyl radicals dominate reoxidation of oxide-derived Cu in electrochemical CO2 reduction

a Real-time Raman spectra of surface Cu2O species at −0.3 VRHE and subsequently at open circuit potential (OCP). b Raman spectra under loop tests with a reduction potential at −0.3 VRHE for 10 s and reoxidation potential at OCP for 20 s.