High efficiency graphene/Cu2O electrode for the electrochemical reduction of carbon dioxide to ethanol
Abstract Fabrication of an efficient catalyst for the electrochemical reduction of CO 2 to valuable products at low overpotential remains a severe challenge. Herein, graphene (GN)/Cu 2 O catalyst, with an average particle size of 20–50nm has been synthesized and coated on copper foil. The linear seep voltammetry studies showed that the 0.1mg of GN/Cu 2 O loaded catalyst exhibited the highest current density in CO 2 saturated 0.5M NaHCO 3 electrolyte. The GN/Cu 2 O electrode was significantly more active towards CO 2 reduction showing a current density of approximately 12.2mA/cm 2 at −1.7V versus Ag/AgCl, which is higher than Cu 2 O electrode (8.4mA/cm 2 ). Gas chromatography-mass spectrometry analysis of the liquid products revealed that ethanol (~0.34ppm) was found to be the predominant product at −0.9V with high reasonably Faradaic efficiency up to 9.93%. These results suggest that graphene may be used as a promising non-metallic support for the electrochemical reduction of CO 2 . Highlights Graphene/Cu 2 O electrode was fabricated for the electrochemical reduction of CO 2 . Very low material loading of graphene/Cu 2 O (0.1mg) resulted in significant conversion of CO 2 to ethanol. The Faradaic efficiency for ethanol was 9.93% at −0.9V vs. Ag/AgCl. Graphical abstract [DISPLAY OMISSION]
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