Preparation of novel sulfonated poly(ether ether ketone) composite membranes
Though sulfonated poly(ether ether ketone) (SPEEK) composite membranes with HPA improved the proton conductivity for direct methanol fuel cells (DMFC) applications, these membranes increase methanol crossover and heteropolyacids were prone to leach out from membranes. In this study, novel composite membranes were prepared from SPEEK, containing phosphotungstic acid (PWA) and silica generated by hydrolysis of tetraethyl orthosilicate. ATR/FT-IR spectrographic measurements indicated that the Keggin structure characteristics of PW12O40 3- anion was present in PWA/SiO2/SPEEK composite membranes. XRD analysis of the composite membranes confirmed that PWA and SiO2 were amorphous. The PWA/SiO2/SPEEK composite membranes had good proton conductivity and less methanol permeability. It can be seen that the relationship between methanol permeability or proton conductivity and temperature were agreed with the Arrhenius Equation. Activation energy of proton and methanol migration could be calculated according to the Arrhenius equation. The stability of PWA in composite membranes was enhanced by doped SiO2. It could be conclude that PWA/SiO2/SPEEK composite membranes have a potential to be considered for direct methanol fuel cells (DMFC) applications.
Composite membrane Sulfonated poly(ether ether ketone) Phosphotungstic acid Silica Direct methanol fuel cell(DMFC)
Hong Zhu Wu-bin Yang Xudong Cao
Chemistry Institute of Science School, Beijing Jiaotong University, Beijing 100044, China Department of Chemical Engineering, University of Ottawa ，161 Louis Pasteur, Ottawa, Ontario, K1N 6N
国际会议
The 5th International Conference on Separation Science and Technology(第五届国际分离科学与技术会议)
北京
英文
2007-10-14（万方平台首次上网日期，不代表论文的发表时间）