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时间:2020-03-26
《SiO2复合质子交换膜的性能.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学报(WuliHuaxueXuebao)NovemberActaPhys.一Chim.Sin.,2010,26(11):2967-29742967【Article】www.whxb.pku.edu.cnSPES/PWA/SiO2复合质子交换膜的性能龚春丽周毅,闫礼成z文胜1)2,郑根稳(孝感学院化学与材料科学学院,湖北孝感432000;。湖北大学材料科学与工程学院,武汉430062)摘要:以磺化聚醚砜(SPES)为基体,以不同比例的SiO溶胶与磷钨酸(PWA)为掺杂物,制备了一种有望用于直接甲醇燃料电池(DMFC)的新型SPES/PWA/SiO有机.无机复合膜,并经热失重分析(TGA)
2、、差示扫描量热仪(DSC)、扫描电镜(SEM).X射线能谱分析(EDX)等对膜的结构和性能进行了表征,探讨了复合膜用作质子交换膜的可能性.结果表明:复合膜较纯SPES膜具有更高的热稳定性、玻璃化转变温度和吸水率;虽然在室温和电池操作温度(80℃)下,复合膜的拉伸强度均低于纯SPES膜,但即使当SiO。含量高达20%)时,复合膜的拉伸强度仍高于Nation112膜的;SEM图片显示SiO。和PWA在膜中分布均匀,这将有利于连续质子传输通道的形成.对于SiO含量为l5%(),PWA含量为6%()的复合膜,其室温质子传导率达到了0.034S·cm~,与Nafion112膜的相当,但其甲醇渗透率明显降
3、低,仅为商用Nafion112膜的七分之一左右,这表明该复合膜在直接甲醇燃料电池中具有良好的应用前景.关键词:直接甲醇燃料电池;磺化聚醚砜;二氧化硅;磷钨酸;复合膜中图分类号:0646PropertiesofSPES/PWA/SiO2CompositeProtonExchangeMembranesGONGChun—LiZHOUYiYANLi—ChengWENSheng'。ZHENGGen—Wen(FacultyofChemist~andMaterialsScience,XiaoganUniversity,Xiaogan432000,HubeiProvince,PR.China;2Faculty
4、ofMaterialsScienceandEngineering.HubeiUniversity,Wuhan430062,PR.China)Abstract:Novelsulfonatedpoly(ethersulfone)(SPES)~hosphotungsticacid(PWA)/silicaorganic—inorganiccompositemembranesforapplicationindirectmethanolfuelcells(DMFCs)werepreparedbydopingSiO2solandP、ⅣAintoSPESmatrix.Thestructureandperfor
5、manceoftheobtainedmembraneswerecharacterizedbythermogravimetricanalysis(TGA),differentialscanningcalorimetry(DSC),andscanningelectronmicroscopy—energydispersiveX—rayspectroscopy(SEM—EDX),etc.ComparedwiththepureSPESmembrane,Si02andPWAdopingledtohigherthermalstabilities,ahigherglasstransitiontemperatu
6、re(T0,andhigherwateruptake.At20℃andafuelcelloperatingtemperatureof80℃.thetensilesfengthofallthecompositemembraneswaslowerthanthatoftheSPESmembrane.However,evenwhenthecontentofSiO2wasashighas20%(埘),thecompositemembranestillpossessedahigherstrengththanaNation112membrane.Themorphologyofthecompositememb
7、ranesindicatedthatSiO2andPvAwereuniformlydistributedthroughouttheSPESmatrix,whichmayfacilitateprotontransport.Theprotonconductivityofthecompositemembrane(SPES—P-S15%:15%)Si02and6%)PWA)reached0.034S·cm
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