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

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Green Energy & Environment 2023年第3期8卷 893-903页

作者： Min Wang Qianqian Zou Xueqi Dong Nengneng Xu Rong Shao Jianfei Ding Yidong Zhang Jinli Qiao School of Chemistry and Chemical Engineering Yancheng Institute of TechnologyYancheng224051China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092College of Environmental Science and EngineeringDonghua University2999 Ren'min North RoadShanghai201620China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092China

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

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Plasma-grafted alkaline anion—exchange membranes for potential use in direct alcohol fuel cell

Plasma-grafted alkaline anion—exchange membranes for potent...

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第十五届全国等离子体科学技术会议

作者： Jue Hu~a,Chengxu Zhang~(b,),Yuedong Meng China Institute of Plasma Physics,Chinese Academy of Sciences,230031,China

Direct alcohol fuel cells(DAFCs) are expected to be promising power sources ranging from automotive to portable electronic device applications due to their high power density and low environmental pollution.Several merits for alkaline direct alcohol fuel cells(ADAFCs) have been suggested:potential to forego noble metal catalysts;lower fuel permeability;lower overpotentials associated with many electrochemical reactions at high pH;less serious corrosion in alkaline environment;and a significant change in water management.There has been a growing interest in the development of Alkaline anion-exchange membranes(AAEMs),which served dual functions of hydroxide ion conducting and fuels separating,and,as a result,seriously affected the performance of ADAFCs.Plasma grafting as mild and efficient method for introducting functional groups onto the polymer matrix is employed to prepare AAEMs in this study.The ATR-FTIR,XPS and TGA demonstrate that the benzyltrimethylammonium cationic groups are successfully introduced into the PVC matrix via plasma grafting,quaternization and alkalization.The plasma-grafted AAEM exhibits a satisfactory ionic exchange capacity(1.01 mmol g),thermal stability, mechanical property,ionic conductivity(0.0145 S cm) and methanol permeability (9.59×l0 m s).The open circuit voltage of air-breathing ADAFC using plasma-grafted Alkaline anion-exchange membrane is 0.796 V with 1 M EtOH solution at ambient temperature.This performance criterion expects that such kind of plasma-grafted AAEMs have great potential for application in alkaline directly alcohol fuel cells.

关键词： Alkaline anion-exchange membrane direct alcohol fuel cell plasma-grafting polymer powder vinylbenzyl chloride

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