Abstract
Copper is one of the most commonly studied materials for the electrochemical conversion of carbon dioxide (CO2) into valuable chemical products. Numerous efforts have been made to enhance the product selectivity - an important characteristic essential for efficient chemical production from CO2 - of Cu with only marginal progress. Here, we introduce a pulsed-bias technique for the electrochemical reduction of CO2 on Cu catalyst which led to 100% selectivity for CO formation over other carbon products and only produced syngas (CO + H2). X-ray photoelectron spectroscopy (XPS) and controlled CO2 electrochemical reduction experiments suggest that in-situ oxidation and reduction of the Cu causes the preference for CO formation over other carbon products on polycrystalline Cu. Moreover, the observed pulse waveform dependency of the H2 to CO product ratio can also be beneficial by allowing tunable CO2 reduction products as a controllable syngas feedstock for different industrial applications (e.g., Fischer-Tropsch process, and hydroformylation of alkenes to aldehydes) without an additional hydrogen source. This study opens a new route for the selective conversion of CO2 into syngas on robust and cost-effective Cu catalysts, which could be adopted at large scale in the chemical industry. Keywords: Copper, Catalyst, CO2reduction, Syngas, Selectivity, Electrochemistry
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