Materials Today Energy ( IF 9.3 ) Pub Date : 2020-05-17 , DOI: 10.1016/j.mtener.2020.100427 W.N.E. Wan Mohd Noral Azman , J. Jaafar , W.N.W. Salleh , A.F. Ismail , M.H.D. Othman , M.A. Rahman , F.R.M. Rasdi
Sulfonated poly (ether ether ketone) (SPEEK) at higher degrees of sulfonation (DS) produced high proton conductivity, but it is impractical for DMFC application due to excessive swelling and severe methanol crossover. In this study, a novel blended membrane based on SPEEK at higher degrees of sulfonation (DS) of 80% and epoxidized natural rubber (ENR-50) are prepared at different mass ratio of SPEEK to ENR-50 (9.5:0.5, 9.0:1.0, 8.5:1.5, 8.0:2.0, and 7.5:2.5) via solution intercalation method. The influence of ENR-50 loading on the physical properties of SPEEK blends membranes was investigated and compared with the pristine SPEEK and Nafion117 membranes. The blended membranes were characterized by FTIR, which showed a successful chemical interaction between ENR-50 and SPEEK matrix. SEM images revealed a uniform dispersion of ENR-50 droplets in the polymer structure. The water uptake and methanol permeability of SPE50 membrane were found to be decreased with increasing of ENR-50 content. The highest proton conductivity of SPE50 membrane obtained was 47% higher than pure SPEEK, whereas the lowest permeability value obtained was 21 times lower than Nafion117 membrane. Consequently, incorporation of ENR-50 into SPEEK matrix has substantially enhanced the selectivity of the membrane by five folds. Apparently, this newly developed SPE blend membrane can be listed as one of the potential proton electrolyte membranes for the usage in DMFCs.
中文翻译:
用于直接甲醇燃料电池的高选择性SPEEK / ENR共混聚合物电解质膜
磺化度(DS)较高的磺化聚醚醚酮(SPEEK)产生高质子传导性,但由于过度溶胀和严重的甲醇穿透,在DMFC应用中不切实际。在这项研究中,以SPEEK与ENR-50的不同质量比(9.5:0.5、9.0:9)制备了基于80%较高磺化度(DS)的SPEEK和环氧化天然橡胶(ENR-50)的新型共混膜。 1.0、8.5:1.5、8.0:2.0和7.5:2.5)通过解决方案插值方法进行。研究了ENR-50负载量对SPEEK共混膜物理性能的影响,并将其与原始的SPEEK和Nafion117膜进行了比较。FTIR表征了共混膜,表明ENR-50与SPEEK基质之间具有成功的化学相互作用。SEM图像显示ENR-50液滴在聚合物结构中的均匀分散。随着ENR-50含量的增加,SPE50膜的吸水率和甲醇渗透率降低。获得的SPE50膜的最高质子传导率比纯SPEEK高47%,而获得的最低的渗透率值则比Nafion117膜低21倍。因此,将ENR-50掺入SPEEK基质中,膜的选择性大大提高了五倍。显然,这种新开发的SPE共混膜可以被列为DMFC中潜在的质子电解质膜之一。获得的SPE50膜的最高质子传导率比纯SPEEK高47%,而获得的最低的渗透率值比Nafion117膜低21倍。因此,将ENR-50掺入SPEEK基质中,膜的选择性大大提高了五倍。显然,这种新开发的SPE共混膜可以被列为DMFC中潜在的质子电解质膜之一。获得的SPE50膜的最高质子传导率比纯SPEEK高47%,而获得的最低的渗透率值比Nafion117膜低21倍。因此,将ENR-50掺入SPEEK基质中,膜的选择性大大提高了五倍。显然,这种新开发的SPE共混膜可以被列为DMFC中潜在的质子电解质膜之一。