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为优化及构建高速质子传输孔道，解决高质子传导率和低甲醇渗透率难以兼具的难题，以规模化生产的熔喷聚苯硫醚(PPS)非织造材料为基材，将氨基酸(酪氨酸、赖氨酸、甘氨酸、半胱氨酸)固载到磺化聚苯硫醚(SPPS)纤维膜上，用Nafion溶液浸渍涂覆及功能化改性后得到高导低渗质子交换膜(PEM)。结果表明：氨基酸上的大量极性基团诱导水分子形成SPPS三维网络连通结构，赋予复合膜良好的尺寸稳定性；通过氨基酸上氨基和羧基的功能化改性，改善了基体/基质界面作用，质子传输通道得到优化；复合膜的电导率在很大程度上取决于所固载氨基酸的质子转移能力，质子转移能力的顺序为—SH >—OH >—NH2；与Nafion膜相比，固载氨基酸的复合膜的吸水率均显著提高，溶胀率均显著下降，质子传导率均提高，而甲醇渗透率均降低；80℃条件下负载半胱氨酸的SPPS-Cys/Nafion复合膜的质子传导率最高为0.297 S/cm，其甲醇渗透率为7.6×10-7 cm2/s，在60℃和100%相对湿度(RH)条件下SPPS-Cys/Nafion复合膜单电池密度可达104.8 mW/cm2。
Abstract：To optimize and construct high-speed proton transport channels, and to address the challenge of achieving both high proton conductivity and low methanol permeability, the meltblown polyphenylene sulfide(PPS) nonwoven material produced on a large scale was used as the substrate, and amino acids(tyrosine, lysine, glycine, and cysteine) were solidly loaded onto the SPPS fibrous membranes, which were impregnated and coated with Nafion solution and functionalized to obtain the high-conductivity and low-permeability proton exchange membrane(PEM).The results showed that a large number of polar groups on amino acids induce water molecules to form an SPPS three-dimensional network connected structure, endowing the composite membrane with good dimensional stability; by functionalizing amino and carboxyl groups on amino acids, the substrate/matrix interface interaction has been improved, and proton transport channels have been optimized; the conductivity of composite membranes largely depends on the proton transfer ability of the loaded amino acids, with the order of proton transfer ability being —SH > —OH > —NH2. Compared with Nafion membrane, the water uptake of the composite membranes loaded with amino acids was significantly increased, the swelling rate was significantly decreased, the proton conductivity was increased, and the methanol permeability was reduced. The proton conductivity of the SPPS-Cys/Nafion composite membrane loaded with cysteine at 80 ℃ is the highest at 0.297 S/cm, and its methanol permeability is 7.6 × 10-7cm2/s. Under 60 ℃ and 100% relative humidity(RH) conditions, the single-cell density of the SPPS-Cys/Nafion composite membrane can reach 104.8 mW/cm2.
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基本信息:
中图分类号:TB383.2;TM911.4
引用信息:
[1]张马亮,罗胜寒,张萌恩,等.高质子传导/低甲醇渗透型氨基酸固载磺化聚苯硫醚质子交换膜[J].天津工业大学学报,2026,45(02):9-18.
基金信息:
国家自然科学基金项目（51603145;51873152）
2026-04-25
2026-04-25