Anion-exchange membranes(AEMs)with high conductivity and stability are essential components of hydrogen related water electrolysis and fuel cell applications.During the past decades,polynorbornene(PNB)-based AEMs have...Anion-exchange membranes(AEMs)with high conductivity and stability are essential components of hydrogen related water electrolysis and fuel cell applications.During the past decades,polynorbornene(PNB)-based AEMs have shown excellent performance due to their saturated all-carbon-based backbones and diverse strategies to prepare cross-linked membranes.However,nearly all previously reported PNB-based AEMs rely on the alkyl-substituted norbornene monomers,whose low-yielding synthesis leads to high-cost of the AEMs.In addition,the crosslinked PNB-based AEMs usually suffered from mechanical brittleness.Herein,we propose a novel semi-interpenetrating polymer network(s-IPN)strategy to simultaneously enhance mechanical modulus and ionic conductivity,while using commercial 5-vinyl-2-norbornene(VNB)as the single norbornene derivatives to prepare high-performance AEMs.A diallylphenol quaternary ammonium salt was used for photo-induced crosslinking with poly-VNB and various dithiols to produce AEMs with s-IPN structures.The resultant membranes have excellent hydroxide conductivities and alkaline stability in 1 mol/L KOH at 80℃,and are successfully applied in alkaline anion-exchange membrane water electrolyzers to stably operateforover150h.展开更多
基金financially supported by the Ministry of Science and Technology of China under the National Key R&D Program of China (No.2023YFB3811200)the National Natural Science Foundation of China (No.22075292).
文摘Anion-exchange membranes(AEMs)with high conductivity and stability are essential components of hydrogen related water electrolysis and fuel cell applications.During the past decades,polynorbornene(PNB)-based AEMs have shown excellent performance due to their saturated all-carbon-based backbones and diverse strategies to prepare cross-linked membranes.However,nearly all previously reported PNB-based AEMs rely on the alkyl-substituted norbornene monomers,whose low-yielding synthesis leads to high-cost of the AEMs.In addition,the crosslinked PNB-based AEMs usually suffered from mechanical brittleness.Herein,we propose a novel semi-interpenetrating polymer network(s-IPN)strategy to simultaneously enhance mechanical modulus and ionic conductivity,while using commercial 5-vinyl-2-norbornene(VNB)as the single norbornene derivatives to prepare high-performance AEMs.A diallylphenol quaternary ammonium salt was used for photo-induced crosslinking with poly-VNB and various dithiols to produce AEMs with s-IPN structures.The resultant membranes have excellent hydroxide conductivities and alkaline stability in 1 mol/L KOH at 80℃,and are successfully applied in alkaline anion-exchange membrane water electrolyzers to stably operateforover150h.
