The effects of current collector for changing selectivity of high- order carbon products in electrochemical CO 2 reduction Jonghyeok Park, Hyunjoon Song* Department of Chemistry, KAIST, South Korea The combustion of fossil fules has led to a considerable increase in the concentration of carbon dioxide (CO 2 ) in the atmosphere, which contributes significantly to global warming. Electrochemical CO 2 reduction reaction (eCO 2 RR) is an effective strategy for mitigating the concentration of CO 2 . Various methods have been developed to enhance the efficiency of eCO 2 RR for the synthesis of high-order carbon products. Among them, the tandem reaction, which combines CO producers and copper using a sequential synthetic approach, is known as a promising method. In this study, we replaced the current collector material from carbon to silver, which can promote CO production for tandem reaction to improve efficiency of eCO 2 RR. We prepared Ag nanowires via the polyol method since they are stable and can construct a conductive layer on the PTFE gas diffusion electrode (GDE). Cu 2 O nanocubes were employed as the main active catalyst in this study. We tested the electrochemical CO 2 reduction performances of Cu 2 O nanocubes on PTFE - Ag nanowire layer and carbon paper in the GDE cell system. At -360 mA cm -2 , the PTFE - Ag nanowire electrode recorded a faradaic efficiency of 15% of ethylene and 23% ethanol, while carbon paper recorded 34% ethylene and 10% ethanol. The difference in selectivity of high- order carbon products may affect the local CO concentration synthesized by Ag nanowires.
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