Communication—Potential Pulsing Photoelectrochemical Reduction of Carbon Dioxide to Ethanol

Photoelectrochemical reduction of CO2 to ethanol at p type CuInS2 thin film photocathode is suggested in this Communication. In order to enhance ethanol yield, potential pulsing approach is employed in the photoelectrochemical reduction. 275.7 μM ethanol is obtained at switching potentials between −0.60 and −0.80 V and pulse period of 2 s for total CO2 reduction time of 5 h, which is three times as the yield by potentiostatic reduction at −0.60 V.