A novel inorganic-organic composite membrane based on sulfonated polyether ether ketone(SPEEK) with embedded phosphotungstic acid(PWA) for direct methanol fuel cells(DMFC) was prepared. IR spectra results indicate tha...A novel inorganic-organic composite membrane based on sulfonated polyether ether ketone(SPEEK) with embedded phosphotungstic acid(PWA) for direct methanol fuel cells(DMFC) was prepared. IR spectra results indicate that PWA was kept in SPEEK matrix as the Keggin structure. From SEM micrograph, it could be found that the solid PWA were well mixed with SPEEK matrix and showed no agglomeration in the membrane. Proton conductivity of the PWA/SPEEK composite membrane is higher than that of pure SPEEK membrane, and is similar or superior to that of Nafion ○R 115 membrane in the temperature range 80—110 ℃. Methanol permeability of the PWA/SPEEK membrane was considerably smaller than that of Nafion ○R 115 membrane. Because of its high conductivity and low methanol permeability, the PWA/SPEEK membrane seems to be an excellent candidate for DMFC applications.展开更多
本研究以磺化度为75%的磺化聚醚醚酮(sulfonated polyetheretherketone,SPEEK)为基础材料,添加聚醚酰亚胺(polyetherimide,PEI)和离子液体(ion ic liquids,ILs),制备SPEEK/PEI@ILs酸碱复合膜,对其吸水率、溶胀度、质子电导率、热稳定性...本研究以磺化度为75%的磺化聚醚醚酮(sulfonated polyetheretherketone,SPEEK)为基础材料,添加聚醚酰亚胺(polyetherimide,PEI)和离子液体(ion ic liquids,ILs),制备SPEEK/PEI@ILs酸碱复合膜,对其吸水率、溶胀度、质子电导率、热稳定性进行探究,并将SPEEK/PEI@ILs复合膜制备成膜电极,对其质子交换膜水电解(proton exchange membrane water equivalent,PEMWE)性能进行测试。结果显示,SPEEK/PEI@ILs复合膜在质子电导率和溶胀度方面与商业化的Nafion117膜表现出相近的性能。这表明PEI的引入有效提升了复合膜的尺寸稳定性。PEMWE性能结果显示,在1 A/cm的电流密度下,槽电压稳定在2.75 V,该膜电极能够稳定运行长达10 h。展开更多
文摘A novel inorganic-organic composite membrane based on sulfonated polyether ether ketone(SPEEK) with embedded phosphotungstic acid(PWA) for direct methanol fuel cells(DMFC) was prepared. IR spectra results indicate that PWA was kept in SPEEK matrix as the Keggin structure. From SEM micrograph, it could be found that the solid PWA were well mixed with SPEEK matrix and showed no agglomeration in the membrane. Proton conductivity of the PWA/SPEEK composite membrane is higher than that of pure SPEEK membrane, and is similar or superior to that of Nafion ○R 115 membrane in the temperature range 80—110 ℃. Methanol permeability of the PWA/SPEEK membrane was considerably smaller than that of Nafion ○R 115 membrane. Because of its high conductivity and low methanol permeability, the PWA/SPEEK membrane seems to be an excellent candidate for DMFC applications.
