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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Study on the Chemical Stabilities of Poly(arylene ether) Random Copolymers for Alkaline Fuel Cells: Effect of Main Chain Structures with Different Monomer Units
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Study on the Chemical Stabilities of Poly(arylene ether) Random Copolymers for Alkaline Fuel Cells: Effect of Main Chain Structures with Different Monomer Units

机译：碱性燃料电池聚（亚芳基醚）无规共聚物的化学稳定性研究：不同单体单元主链结构的影响

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We developed a series of heterocyclic quaternary ammonium-type poly(arylene ether) (PAE) random copolymers with moieties of sulfone, ketone, hexafluoroisopropyl, isopropyl, phenolphthalein, or phenylene to identify differences in the physicochemical properties of the AEM due to polymer backbone structure containing electron-withdrawing groups (EWGs) or electron-donating groups (EDGs). The 1-methyl pyrrolidine (PYR)-PAE membranes containing EDGs exhibited higher hydroxide conductivity compared with PYR-PAE membranes with EWGs due to more distinctly separated ion transport sites, which was confirmed through AFM phase images. The ionic conductivity of all prepared membranes was greater than 89% after an alkaline stability test for 700 h in 2 M KOH at 70 °C, PYR-PAE membranes with EDGs higher than that of EWGs revealed stronger alkaline stability. In particular, the PYR-PAE-PhPh membrane retained the highest alkaline stability of 96.9% due to the steric hindrance effect. In fuel cell operation, the PYR-PAE-PhPh membrane representing EDGs showed a higher power density (109 mW cm~(-2)) than that of the PYR-PAE-BPHF membrane (89 mW cm~(-2)) and commercial AEM (Fumion-FAA-3, 30 mW cm~(-2)). On the basis of these results, we suggest that structural design of the backbone is a critical strategy to develop an AEM with remarkable electrochemical properties and alkaline stability for alkaline fuel cell applications.
机译：我们开发了一系列杂环季铵型聚（亚芳基醚）（PAE）随机共聚物，其部分砜，酮，六氟异丙基，异丙基，酚酞或亚苯基，以鉴定由于聚合物骨架结构引起的AEM的物理化学性质的差异含有吸电子基团（EWG）或电子捐赠组（EDG）。含有EDG的1-甲基吡咯烷（Pyr）-Pae膜与具有EWG的Pyr-Pee膜相比，氢氧化物导电率较高，由于更明显的离子输送位点，通过AFM相位图像证实。在700小时的碱性稳定性试验在700小时在700h在70℃下，在70℃下，Pyr-PAE膜高于EWG的碱性膜的碱性稳定性试验且呈碱性稳定性较强的碱性稳定性，所有制备的膜的离子电导率大于89％。特别是，由于空间阻断效应，Pyr-PAE-PHPH膜保留了96.9％的最高碱性稳定性。在燃料电池操作中，代表EDG的Pyr-PAE-PHPH膜显示出比Pyr-PAE-BPHF膜（89mW cm〜（-2））的功率密度（109mm cm〜（-2））较高商业AEM（FUMION-FAA-3,30 MW CM〜（-2））。在这些结果的基础上，建议骨干的结构设计是开发AEM具有显着电化学性质和碱性燃料电池应用的碱性稳定性的关键策略。

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