Imidazolium group prompted alkaline anion-exchange membrane with high performance for efficient electrochemical CO_(2) conversion  

作　　者：Min Wang Qianqian Zou Xueqi Dong Nengneng Xu Rong Shao Jianfei Ding Yidong Zhang Jinli Qiao 

机构地区：[1]School of Chemistry and Chemical Engineering,Yancheng Institute of Technology,Yancheng,224051,China [2]Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200092,College of Environmental Science and Engineering,Donghua University,2999 Ren'min North Road,Shanghai,201620,China [3]Shanghai Institute of Pollution Control and Ecological Security,Shanghai,200092,China

出　　处：《Green Energy & Environment》2023年第3期893-903,共11页绿色能源与环境（英文版）

基　　金：support from the“Scientific and Technical Innovation Action Plan”Basic Research Field of Shanghai Science and Technology Committee (19JC1410500);the National Natural Science Foundation of China (21972017).

摘　　要：Development of high-performance hydroxide-conductive membranes is a focus research subject owing to promising applications in electrochemical reduction of CO_(2)(eCO_(2)RR).However,few satisfactory membranes have been developed to maximize the performance of CO_(2) electrolyzers,despite its role as the core in regulating ion transport and preventing product crossover or fuel loss.Herein,we report the synthesis of alkaline anion-exchange membranes fabricated by poly(vinyl-alcohol)(PVA)and poly[(3-methyl-1-vinylimidazoliummethylsulfate)-co-(1-vinylpyrrolidone)](PQ44)for use in CO_(2) electrolysis.Owing to the unique imidazolium ring structure coupled with a three-dimensional semiinterpenetrating porous internal architecture,the PVA/PQ44-OH-membranes provide a high hydroxide conductivity(21.47 mS cm^(-1)),preferable mechanical property and thermal stability.In particular,the eCO_(2)RR used PVA/PQ44-OH^(-) as electrolyte membrane realized a charming Faradaic efficiency(88%)and partial current density(29 mA cm^(-2))at0.96 VRHE and,delivered the excellent durability over 20 h electrolysis in 0.5 mol L^(-1) KHCO_(3) electrolyte.Notably,it can even enable an ultrahigh current density beyond 100 mA cm^(-2) at^(-1).11 VRHE when the electrolyte was KOH instead,and produced the FEHCOOof 85%at a low potential of0.81 VRHE,superior to both commercial alkaline A201 and acidic Nafion117 membrane.

关 键 词：Alkaline anion-exchange membrane Imidazolium ring structure Semi-interpenetrating network CO_(2)electroreduction Formate production 

分 类 号：X701[环境科学与工程—环境工程] TQ425.236[化学工程]