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(a) Long-term chronoamperometry data of two Cu2O/GR6 electrodes with an identical Cu2O content (1 C), registered at E = +0.05 V and E = −0.05 V potential (vs Ag/AgCl/3 M NaCl), in CO2 saturated 0.1 M Na2SO4 solution. A solar simulator was used employing a UV cutoff filter (<400 nm). (b) Formation of alcohols during the photoelectrolysis presented in (a).
