直接甲醇燃料电池用磺化聚醚醚酮质子交换膜

在回顾近年来直接甲醇燃料电池用磺化聚醚醚酮(SPEEK)质子交换膜的发展历程基础上,分别综述了制膜材料SPEEK的合成和SPEEK质子交换膜的制备研究进展,重点总结了SPEEK质子交换膜的电导率和阻醇性能及其稳定性的影响因素和影响规律,其中包括制膜材料和溶剂以及工艺、SPEEK的共混改性、SPEEK的填充改性或多层复合结构的影响,进而分析了高性能SPEEK质子交换膜的开发研究前景.     

燃料电池用磺化聚醚醚酮薄膜的研究进展

概述了近几年来燃料电池用磺化聚醚醚酮(SPEEK)质子交换膜的研究进展,分别从聚醚醚酮(PEEK)磺化制备SPEEK、SPEEK薄膜的制备和改性SPEEK薄膜等几个方面总结了SPEEK质子交换膜的研究结果,并分析展望了研究工作的发展趋势.     

燃料电池质子交换膜电导与阻醇性能测试方法研究

质子交换膜（PEM）是直接甲醇燃料电池（DMFC）的核心部件,而PEM的电导率和阻醇性能是决定PEM乃至DMFC性能的关键因素。采用自行建立的改进型交流两电极法测量磺化聚醚醚酮（SPEEK）材料PEM的电导率,采用扩散池和折光仪测试PEM甲醇透过性能。结果表明,这些测试装置简易可靠,数据重现性较好,膜的电导率测试对30℃至90℃之间不同的测试温度条件灵敏度较高,膜的电导率和甲醇透过性能测试对不同成膜材料和制膜溶剂均具有较高的分辨率。     

流延法制备的SPEEK/SiO2/SiWA复合膜

用流延法制备了磺化聚醚醚酮(SPEEK)/二氧化硅(Si O2)/硅钨酸(Si WA)复合膜,并分析了复合膜的形貌、质子传导性能、阻醇性能及溶胀性能。m(SPEEK)∶m(Si O2)∶m(Si WA)=70∶10∶20的复合膜性能良好:在90℃时的质子传导率为0.018 S/cm;在30℃和90℃时的甲醇渗透率分别为3.4×10-8cm2/s和5×10-7cm2/s;温度从30℃升高到80℃,吸水率仅增加了17.9%,溶胀率仅增加了0.9%;Si O2和Si WA在复合膜中分散均匀,颗粒细小,没有团聚。     

Sulfonated poly(arylene ether sulfone) nanocomposite electrolyte membrane for fuel cell applications: A review

Polymer electrolyte membrane (PEM) fuel cells are considered a promising technology for generating power with water as a byproduct. Recently, sulfonated poly(arylene ether sulfone) (SPAES) has emerged as a most suitable alternative for PEM applications because of its high proton conductivity, high CO tolerance, and low fuel crossover. However, the existing SPAES polymeric membrane materials have poor chemical reactivity, mechanical processability, and thermal usability. Thus, the effects of mixing inorganic nanomaterials with SPAES polymers on proton conductivity, power density, fuel crossover, thermal and chemical stability, and durability are discussed in this review. Further, the progress in preparation methods and fuel cell characteristics by the addition of silica, clay, heteropolyacids (HPA), and carbon nanotubes (CNTs) in polymer membrane materials for PEM applications is also discussed.     

Sulfonated poly(arylene ether sulfone) as a methanol-barrier layer in multilayer membranes for direct methanol fuel cells

Novel poly(arylene ether sulfone) copolymers containing different amount of pendant sulfonic acid groups have been synthesized by an aromatic substitution polymerization reaction. The properties of the synthesized sulfonated poly(diphenylsulfone-diphenol) (SDPS-DP) copolymers depend on the sulfonic acid group content in the copolymers. Although all the copolymers show good thermal stability, low liquid uptake, and low methanol crossover, they exhibit lower proton conductivity than Nafion or sulfonated poly(ether ether ketone) (SPEEK). Taking advantage of the low methanol crossover, multilayer membranes consisting of the SDPS-DP copolymer as a methanol-barrier center layer and SPEEK as the proton-conducting outer layers have been fabricated and characterized. The SPEEK/SDPS-DP-60/SPEEK multilayer membranes with an optimized center layer thickness are found to exhibit better performance and higher power density in DMFC than plain SPEEK and Nafion 115 membranes.     

SPEEK/epoxy resin composite membranes in situ polymerization for direct methanol fell cell usages

Sulfonated poly(ether ether ketone) (SPEEK)/4,4′-diglycidyl(3,3′,5,5′-tetramethylbiphenyl) epoxy resin (TMBP) composite membranes in situ polymerization were prepared for the purpose of improving the methanol resistance and mechanical properties of SPEEK membranes with high ion-exchange capacities (IEC) for the usage in the direct methanol fuel cells (DMFCs). The effects of introduction of TMBP content on the properties of the composite membranes were investigated in detail. The composite membranes have good mechanical, thermal properties, lower swelling ratio, lower water diffusion coefficient (0.87 × 10⁻⁵ cm² s⁻¹ at 80 °C) and better methanol resistance (5.26 × 10⁻⁷ cm² s⁻¹ at 25 °C) than SPEEK membranes. The methanol diffusion coefficients of the composite membranes are much lower than that of SPEEK membrane (17.5 × 10⁻⁷ cm² s⁻¹ at 25 °C). Higher selectivity was been found for the composite membranes in comparison with SPEEK. Therefore, the SPEEK/TMBP composite membranes show a good potential in DMFCs usages.     

Cross‐Linking of Sulfonated Poly(ether ether ketone) by Thermal Treatment: How Does the Reaction Occur?

The cross‐link reaction between macromolecular chains of sulfonated poly(ether ether ketone) (SPEEK) by thermal treatment above 150 °C in presence of dimethylsulfoxide (DMSO) is investigated by various techniques, including elemental analysis, acid‐base titration, infrared spectroscopy, water uptake (WU) measurements, and thermogravimetry. The conditions of thermal treatment are analyzed. The cross‐linking reaction occurs in at least three more or less activated and deactivated positions with different activation energies, leading to different time dependencies of the cross‐link reaction. The role of residual solvent DMSO is studied particularly: the cross‐linking depends significantly on the amount of solvent in the membranes. Implications on WU and thermal stability are of particular importance for the development of high performance proton‐conducting membranes.