Highly conductive partially cross-linked poly(2,6-dimethyl-1,4-phenylene oxide) as anion exchange membrane and ionomer for water electrolysis
Highly conductive partially cross-linked poly(2,6-dimethyl-1,4-phenylene oxide) as anion exchange membrane and ionomer for water electrolysis
复制标题
DOI：
10.1016/j.ijhydene.2021.09.014
复制
发表时间：
2021-10-18
影响因子：
7.2
通讯作者：
Mamlouk, Mohamed
中科院分区：
文献类型：
--
作者：
Feng, Zhiming;Esteban, Pilar Ocon;Mamlouk, Mohamed
以SnCl4为催化剂，1,3,5-三氧烷和氯三甲基硅烷为环保型氯甲基化试剂，通过Friedel-Crafts反应制备了交联季铵盐化聚（2,6-二甲基-1,4-苯基氧化物）基膜。提出了计算氯甲基化度（DC）和交联度（CLD）的新方程。在80℃下获得了133 mS cm（-1）的离子电导率，这是QPPO基膜报道的最高离子电导率之一。我们将QPPO与氯甲基化聚苯乙烯-b-聚（乙烯/丁烯）-b-聚苯乙烯（SEBS）离聚体进行了比较，并报道了离聚体-膜相互作用的重要性，以及溶胀率和电导率之间的权衡对AEM水电解器性能和机械稳定性的影响。在1 M KOH中放置500 h后的稳定性测试表明，膜保留了高达94%的原始IEC。在电解槽试验中，QPPO被用作膜和离聚体。QPPO膜的面积比电阻为104 m ω cm(-2)，电解电流密度为814 mA cm(-2), 2.0 V， 0.1 m NaOH溶液，40℃(C) 2021 Hydrogen Energy Publications LLC.由Elsevier Ltd出版。版权所有。
Cross-linked quaternised Poly(2,6-dimethyl-1,4-Phenylene Oxide) (QPPO)-based membranes were prepared via Friedel-Crafts reactions using SnCl4 catalyst, 1,3,5-trioxane and chlorotrimethylsilane as environmentally-friendly chloromethylating reagents. New equations to calculate the degree of chloromethylation (DC) and cross-linking degree (CLD) were proposed. Ionic conductivity of 133 mS cm(-1) at 80 degrees C was obtained, one of the highest reported for QPPO based membranes. We have compared QPPO to chloromethylated polystyrene-b-poly(ethylene/butylene)-b-polystyrene (SEBS) ionomer and report on the importance of ionomer-membrane interaction as well as the trade-off between swelling ratio and conductivity on performance and mechanical stability of AEM water electrolyser. Exsitu stability testing after 500 h in 1 M KOH showed membranes retained up to 94% of their original IEC. QPPO was employed as both membranes and ionomers in electrolyser tests. QPPO membranes exhibited area specific resistance of 104 m Omega cm(-2) and electrolyser current density of 814 mA cm(-2) at 2.0 V in 0.1 M NaOH solution at 40 degrees C. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.