Weisheng Yu , Yan Xu , Xianhe Shen , Xiaoqi Yang , Zhiru Liu , Huijuan Wang , Xian Liang , Xiaolin Ge , Michael D. Guiver , Liang Wu , Tongwen Xu
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Moreover, fluorination enhances the mechanical stability and chemical inertness of the ionomer membrane and promotes its self-assembly to construct well-defined microphase separated morphology by increasing chain thermodynamic immiscibility. The resulting fluorinated membrane shows 1.4–1.8-fold improvements in hydroxide conductivity and mechanical properties compared to the fluorine-free counterpart, as well as exceptional alkaline stability (over 90% hydroxide conductivity retention under 2 M aq. NaOH at 80 °C for 2000 h). Such synergistic improvements in ionomer binder and membrane significantly improve the single-cell performance (1.7 vs. 1.0 W cm<sup>−2</sup> peak power density) and durability (1.8 vs. 2.4 mV h<sup>−1</sup> voltage decline rate for 100 h).</p></div>","PeriodicalId":100957,"journal":{"name":"Next Energy","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2949821X24000097/pdfft?md5=a0456d66862109f77823626e8e9b8403&pid=1-s2.0-S2949821X24000097-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Ionomer boosts catalyst layer oxygen transport and membrane ion conduction for fuel cells\",\"authors\":\"Weisheng Yu , Yan Xu , Xianhe Shen , Xiaoqi Yang , Zhiru Liu , Huijuan Wang , Xian Liang , Xiaolin Ge , Michael D. 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引用次数: 0
摘要
用作电极催化剂粘合剂和阴离子交换膜的阴离子交换离子聚合物是阴离子交换膜燃料电池的核心部件。在设计其分子结构时,催化剂粘合剂中的快速氧传输以及离子聚合物和膜的高离子传导性至关重要。在此,我们定制了一种氟化离子膜,并阐明了氟化对催化剂粘合剂和膜性能的影响。氟化离子膜非凡的氧气溶解能力改善了催化剂层三相边界的局部氧气传输。此外,氟化还增强了离子膜的机械稳定性和化学惰性,并通过提高链的热力学不溶性来促进其自组装,从而构建明确的微相分离形态。与不含氟的同类产品相比,氟化膜的氢氧化物传导性和机械性能提高了 1.4-1.8 倍,并且具有优异的碱性稳定性(在 80 °C 的 2 M aq. NaOH 溶液中保持超过 90% 的氢氧化物传导性达 2000 小时)。离子粘合剂和膜的协同改进显著提高了单细胞性能(峰值功率密度为 1.7 W cm-2 与 1.0 W cm-2)和耐用性(100 小时内电压下降率为 1.8 mV h-1 与 2.4 mV h-1)。
Ionomer boosts catalyst layer oxygen transport and membrane ion conduction for fuel cells
Anion exchange ionomers employed as electrode catalyst binders and anion exchange membranes are central components for anion exchange membrane fuel cells. Fast oxygen transport in the catalyst binder and high ion conductivity of the ionomer and membrane are essential while designing their molecular structure. Here, we tailor a fluorinated ionomer and elucidate the effect of fluorination on the properties of catalyst binder and membrane. The extraordinary oxygen-dissolving capacity of the fluorinated ionomer improves the local oxygen transport at the catalyst layer triple-phase boundary. Moreover, fluorination enhances the mechanical stability and chemical inertness of the ionomer membrane and promotes its self-assembly to construct well-defined microphase separated morphology by increasing chain thermodynamic immiscibility. The resulting fluorinated membrane shows 1.4–1.8-fold improvements in hydroxide conductivity and mechanical properties compared to the fluorine-free counterpart, as well as exceptional alkaline stability (over 90% hydroxide conductivity retention under 2 M aq. NaOH at 80 °C for 2000 h). Such synergistic improvements in ionomer binder and membrane significantly improve the single-cell performance (1.7 vs. 1.0 W cm−2 peak power density) and durability (1.8 vs. 2.4 mV h−1 voltage decline rate for 100 h).