Recovering carbon losses in CO2 electrolysis using a solid electrolyte reactor
Recovering carbon losses in CO2 electrolysis using a solid electrolyte reactor
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DOI：
10.1038/s41929-022-00763-w
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发表时间：
2022-04-18
期刊：
影响因子：
37.8
通讯作者：
Wang, Haotian
中科院分区：
文献类型：
--
作者：
Kim, Jung Yoon 'Timothy';Zhu, Peng;Wang, Haotian
电化学CO2还原技术的实际实施面临着巨大的挑战，因为在传统的CO2电解槽中，通过界面碳酸盐的形成，CO2会与O-2混合到阳极侧。在这里，我们报告了一种多孔固体电解质反应器策略，以有效地回收这些碳损失。通过在阴极和阳极之间创造一种可渗透的、离子导电的磺化聚合物电解质作为缓冲层，交叉碳酸盐可以与阳极产生的质子结合，重新形成二氧化碳气体以供再利用，而不与阳极O-2混合。使用银纳米线催化剂将CO2还原为CO，我们证明了在超高气体纯度形式（bbb99 %）下，交叉CO2的回收率高达90%，同时在200 mA cm（-2）电流下提供超过90%的CO法拉第效率。通过将回收的CO2再循环到CO2输入流中，实现了90%以上的连续CO(2)转化效率。
The practical implementation of electrochemical CO2 reduction technology is greatly challenged by notable CO2 crossover to the anode side, where the crossed-over CO2 is mixed with O-2, via interfacial carbonate formation in traditional CO2 electrolysers. Here we report a porous solid electrolyte reactor strategy to efficiently recover these carbon losses. By creating a permeable and ion-conducting sulfonated polymer electrolyte between cathode and anode as a buffer layer, the crossover carbonate can combine with protons generated from the anode to re-form CO2 gas for reuse without mixing with anodic O-2. Using a silver nanowire catalyst for CO2 reduction to CO, we demonstrated up to 90% recovery of the crossover CO2 in an ultrahigh gas purity form (>99%), while delivering over 90% CO Faradaic efficiency under a 200 mA cm(-2) current. A high continuous CO(2 )conversion efficiency of over 90% was achieved by recycling the recovered CO2 to the CO2 input stream.