CdS-Enhanced Ethanol Selectivity in Electrocatalytic CO Reduction at Sulfide-Derived Cu-Cd.

The development of Cu-based catalysts for the electrochemical CO reduction reaction (eCO RR) is of major interest for generating commercially important C liquid products such as ethanol. Cu is exclusive among the eCO RR metallic catalysts in that it facilitates the formation of a range of highly reduced C products, with a reasonable total faradaic efficiency but poor product selectivity. Here, a series of new sulfide-derived copper-cadmium catalysts (SD-Cu Cd ) was developed. An excellent faradaic efficiency of around 32 % but with a relatively low current density of 0.6 mA cm for ethanol was obtained using the SD-CuCd catalyst at the relatively low overpotential of 0.89 V in a CO -saturated aqueous 0.10 m KHCO solution with an H-cell. The current density increased by an order of magnitude under similar conditions using a flow cell where the mass transport rate for CO was greatly enhanced. Ex situ spectroscopic and microscopic, and voltammetric investigations pointed to the role of abundant phase boundaries between CdS and Cu /Cu sites in the SD-CuCd catalyst in enhancing the selectivity and efficiency of ethanol formation at low potentials.