Acid-humidified CO<sub>2</sub> gas input for stable electrochemical CO<sub>2</sub> reduction reaction.
basic_science · Level V
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- Record sourced from PubMed, PMID 40504913.
- Also identified by DOI 10.1126/science.adr3834.
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Abstract
(Bi)carbonate salt formation has been widely recognized as a primary factor in poor operational stability of the electrochemical carbon dioxide reduction reaction (CO<sub>2</sub>RR). We demonstrate that flowing CO<sub>2</sub> gas into an acid bubbler-which carries trace amounts of acid vapor into a gas diffusion electrode for silver-catalyzed CO<sub>2</sub>RR to carbon monoxide (CO)-can prevent salt accumulation. In a 100-square-centimeter, scaled-up CO<sub>2</sub>RR membrane electrode assembly electrolyzer with single serpentine flow channels, the acid humidification method achieved the 4500 hours of stability milestone at 100 mA cm<sup>-2</sup> without compromising the CO faradaic efficiency, whereas a conventional water-humidified CO<sub>2</sub> feed only operated stably for ~80 hours. The acid-humidified CO<sub>2</sub> approach was extended to bismuth, copper, and zinc catalysts.