磷酸插层氧化石墨烯强化膜质子传导特性研究

Investigation of Proton Conduction Enhancement of Membrane by Phosphoric Acid Intercalated Graphene Oxide

实验采用改进后的Hummers法制备氧化石墨烯(GO),在片间插层磷酸后进而制得磷酸插层氧化石墨烯(PGO),通过流涎法将GO和PGO填充到磺化聚醚醚酮(SPEEK)基质中制备复合质子交换膜,系统测定分析了复合膜的物化特性和质子传递特性.实验结果表明:所制备的复合膜在290℃下具有良好的热稳定性;无水条件下,PGO的加入在膜内形成了高效质子传递通道,显著提升了复合膜的质子传递能力;在150℃下,SPEEK/PGO-50的质子传导率达7.92 mS·cm^(-1),是SPEEK空白膜的5.7倍、SPEEK/GO膜的4.6倍.

Herein,graphene oxide(GO)was synthesized through the improved Hummers method,And then phosphoric acid was intercalated into the interlayers to fabricate phosphoric acid intercalated graphene oxide(PGO).GO and PGO were incorporated into sulfonated poly(ether ether ketone)(SPEEK)matrix to prepare composite membranes through solution casting method.The physicochemical property and proton conduction property of composite membranes were investigated in detail.The results suggested that all the membranes were thermally stable up to 290℃.Under anhydrous condition,the PGO formed highly efficient transfer channels in composite membrane,which significantly enhanced the proton conduction property of membrane.Particularly,the proton conductivity of SPEEK/PGO-50 reached 7.92 mS·cm^-1 at 150℃,which was 5.7 times of that of SPEEK control membrane and 4.6 times of that of SPEEK/GO.