Promoter Effects of Functional Groups of Hydroxide-Conductive Membranes on Advanced CO2 Electroreduction to Formate
Promoter Effects of Functional Groups of Hydroxide-Conductive Membranes on Advanced CO2 Electroreduction to Formate
复制标题
氢氧化物导电膜官能团对高级 CO2 电还原生成甲酸盐的促进作用
DOI：
10.1021/acsami.8b11845
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Qiao Jinli
中科院分区：
文献类型：
--
作者：
Wang Min;Preston Nicholas;Xu Nengneng;Wei Yanan;Liu Yuyu;Qiao Jinli
CO2在环境条件下的电化学还原提供了将废弃的温室气体转化为商品化学品或燃料的潜在解决方案;然而，尚未开发出用于最大化CO2电解槽性能的令人满意的离子传导膜。在这里，我们报告的氢氧化物导电聚合物膜，这是基于聚合物复合材料的聚（乙烯醇）/瓜尔胶羟丙基三甲基氯化铵，用于CO2电解的序列的合成。不同的膜功能团，包括噻吩，羟基苄基，和二甲基辛醛，对CO2电还原到甲酸的效率和选择性的影响进行了全面评估。该膜结合噻吩基团表现出最高的法拉第效率为71.5%，在施加的电位为-1.64 V对饱和甘汞电极（SCE）的甲酸盐。相比之下，含有羟苄基和二甲基辛醛基团的膜分别产生67.6%和68.6%的较低效率，而商业Nafion 212膜的效率仅为57.6%。含噻吩基团的膜的效率和选择性的提高归因于氢氧化物电导率的显着增加（0.105 S cm-1），优良的物理化学性质，和甲酸产物交叉的同时衰减。
The electrochemical reduction of CO2at ambient conditions provides a latent solution of turning waste greenhouse gases into commodity chemicals or fuels; however, a satisfactory ion-conducting membrane for maximizing the performance of a CO2electrolyzer has not been developed. Here, we report the synthesis of a sequence of hydroxide-conductive polymer membranes, which are based on polymer composites of poly(vinyl alcohol)/Guar hydroxypropyltrimonium chloride, for use in CO2electrolysis. The effect of different membrane functional groups, including thiophene, hydroxybenzyl, and dimethyloctanal, on the efficiency and selectivity of CO2electroreduction to formate is thoroughly evaluated. The membrane incorporating thiophene groups exhibits the highest Faradaic efficiency of 71.5% at an applied potential of −1.64 V versus saturated calomel electrode (SCE) for formate. In comparison, membranes containing hydroxybenzyl and dimethyloctanal groups produced lower efficiencies of 67.6 and 68.6%, respectively, whereas the commercial Nafion 212 membrane was only 57.6% efficient. The improved efficiency and selectivity of membranes containing thiophene groups are attributed to a significantly increased hydroxide conductivity (0.105 S cm–1), excellent physicochemical properties, and the simultaneous attenuation of formate product crossover.