Acid-humidified CO2 gas input for stable electrochemical CO2 reduction reaction

• 成果类型: Article
• 署名作者: Hao, Shaoyun; Elgazzar, Ahmad; Zhang, Shou-Kun; Wi, Tae-Ung; Chen, Feng-Yang; Feng, Yuge; Zhu, Peng; Wang, Haotian
• 署名单位: Rice University; Rice University; Rice University; Rice University; Rice University
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-12151
• DOI: 10.1126/science.adr3834
• 发表日期: 2025-06-12
• 关键词: oxygen evolution; electrolysis; selectivity; conversion; density

摘要

(Bi)carbonate salt formation has been widely recognized as a primary factor in poor operational stability of the electrochemical carbon dioxide reduction reaction (CO2RR). We demonstrate that flowing CO2 gas into an acid bubbler-which carries trace amounts of acid vapor into a gas diffusion electrode for silver-catalyzed CO2RR to carbon monoxide (CO)-can prevent salt accumulation. In a 100-square-centimeter, scaled-up CO2RR membrane electrode assembly electrolyzer with single serpentine flow channels, the acid humidification method achieved the 4500 hours of stability milestone at 100 mA cm(-2) without compromising the CO faradaic efficiency, whereas a conventional water-humidified CO2 feed only operated stably for similar to 80 hours. The acid-humidified CO2 approach was extended to bismuth, copper, and zinc catalysts.