Shaoyun Hao, Ahmad Elgazzar, Shou-Kun Zhang, Tae-Ung Wi, Feng-Yang Chen, Yuge Feng, Peng Zhu, Haotian Wang
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引用次数: 0
摘要
（Bi）碳酸盐岩的形成已被广泛认为是电化学二氧化碳还原反应（CO2RR）操作稳定性差的主要因素。我们证明，将二氧化碳气体注入酸性起泡器（酸性起泡器携带微量酸蒸汽进入气体扩散电极，将银催化的CO2RR转化为一氧化碳）可以防止盐的积累。在一个100平方厘米的、带有单一蛇形流通道的CO2RR膜电极组件电解槽中，酸加湿方法在100 mA cm-2下实现了4500小时的稳定里程碑，而不影响CO的法拉第效率，而传统的水加湿CO2进料只能稳定运行约80小时。酸加湿CO2方法扩展到铋、铜和锌催化剂。
Acid-humidified CO2 gas input for stable electrochemical CO2 reduction reaction.
(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 ~80 hours. The acid-humidified CO2 approach was extended to bismuth, copper, and zinc catalysts.
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