Afzal Jamal, Fu Yaomei, Luan Tian-Xiang, Zhang Deshan, Li Yangyang, Li Hailian, Cheng Ke, Su Zhongmin, Li Pei-Zhou
School of Chemistry and Chemical Engineering, Shandong University, No. 27 Shanda South Road, Ji'nan 250100, Shandong Province, People's Republic of China.
Shandong Peninsula Engineering Research Center of Comprehensive Brine Utilization, Weifang University of Science and Technology, Shouguang 262700, Shandong Province, People's Republic of China.
Soft Matter. 2022 Jul 27;18(29):5518-5523. doi: 10.1039/d2sm00451h.
Developing a facile strategy to construct low-cost and efficient proton-conductive electrolytes is pivotal in the practical application of proton exchange membrane (PEM) fuel cells. Herein, a polyamide with in-built -SOH moieties, PA(PhSO3H)2, was synthesized a simple one-pot polymeric acylation process. Investigations electrochemical impedance spectroscopy (EIS) measurements revealed that the fabricated PA(PhSO3H)2 displays a proton conductivity of up to 5.54 × 10 S cm at 353 K under 98% relative humidity (RH), which is more than 2 orders of magnitude higher than that of its -SOH-free analogue PA(Ph)2 (2.38 × 10 S cm) under the same conditions. Therefore, after mixing with polyacrylonitrile (PAN) at different ratios, PA(PhSO3H)2-based matrix-mixed membranes were subsequently made and the analysis results revealed that the proton conductivity can reach up to 5.82 × 10 S cm at 353 K and 98% RH when the weight ratio of PA(PhSO3H)2 : PAN is in 3 : 1 (labeled as PA(PhSO3H)2-PAN(3 : 1)), the value of which is comparable even to those of commercially available electrolytes that are used in PEM fuel cells. In addition, continuous testing shows that PA(PhSO3H)2-PAN(3 : 1) possesses long-life reusability. This work demonstrates that, utilizing the simple reaction of polymeric acylation with a sulfonated module as a precursor, highly effective proton-conductive membranes for PEM fuel cells can be achieved in a facile manner.
开发一种简便的策略来构建低成本且高效的质子传导电解质对于质子交换膜（PEM）燃料电池的实际应用至关重要。在此，通过简单的一锅法聚合酰化过程合成了一种带有内置 -SOH 基团的聚酰胺 PA(PhSO3H)2。电化学阻抗谱（EIS）测量研究表明，制备的 PA(PhSO3H)2 在 353 K 和 98%相对湿度（RH）下显示出高达 5.54×10⁻² S cm⁻¹ 的质子传导率，这比其不含 -SOH 的类似物 PA(Ph)2 在相同条件下的质子传导率（2.38×10⁻⁴ S cm⁻¹）高出两个多数量级。因此，在将 PA(PhSO3H)2 与聚丙烯腈（PAN）以不同比例混合后，随后制备了基于 PA(PhSO3H)2 的基质混合膜，分析结果表明，当 PA(PhSO3H)2 与 PAN 的重量比为 3∶1 时（标记为 PA(PhSO3H)2-PAN(3∶1)），在 353 K 和 98% RH 下质子传导率可达到 5.82×10⁻² S cm⁻¹，该值甚至与 PEM 燃料电池中使用的市售电解质相当。此外，连续测试表明 PA(PhSO3H)2-PAN(3∶1)具有长寿命的可重复使用性。这项工作表明，利用带有磺化模块的聚合物酰化简单反应作为前体，可以简便地实现用于 PEM 燃料电池的高效质子传导膜。
