Laboratory study demonstrates potential-dependent product selectivity during carbon dioxide reduction on copper, indicating precise voltage control governs hydrocarbon and alcohol formation.
Potentiostatic electrochemical reduction of CO2 was carried out at a Cu electrode in 0.1 mol dm−3 KHCO3 aqueous solution at 298 K. As reduction products from CO2, HCOO−, CO, CH4, C2H4, CH3CHO, C2H5OH, C2H5CHO, n-C3H7OH etc. were detected and determined by gas chromatography and high performance liquid chromatography. The composition of these products changed drastically with a slight variation of electrode potential.
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Noda et al. (1989) studied this question.
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