期刊
REACTION CHEMISTRY & ENGINEERING
卷 6, 期 4, 页码 612-628出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1re00001b
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By converting CO2 to CO in a two-step process and promoting the conversion of CO to C2+ in alkaline electrolytes, the efficient production of C2+ products with high selectivity is achieved, pushing chemical production from environmentally abundant molecules closer to practical application.
The electrochemical conversion of carbon dioxide (CO2) towards clean fuels and chemicals powered by renewable energy is a promising strategy to realize the closing of the loop of carbon footprint. However, the direct reduction of CO2 to multi-carbon (C2+) products suffers from low activity in non-alkaline electrolyte or electrolyte degradation problem caused by carbonate formation in alkaline electrolyte. The two-step process for CO2 electrocution can circumvent such problems by converting CO2 to CO (the first step) in the non-alkaline electrolyte and promote the rate of carbon-carbon coupling for CO-to-C2+ conversion (the second step) in alkaline electrolytes. We summarize the recent progress of CO-selective catalysts, C2+-selective catalysts, tandem catalysts, and tandem reaction systems, which aim to achieve the efficient production of C2+ products with high selectivity. The two-step route of CO2 reduction pushes the chemical production from environmentally abundant molecules closer to the practical application, offering a promising replacement in the petrochemical industry for chemical production under hydrogen economy in the future.
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