Abstract Ammonium functionalized anion exchange silica precursor (AESP) is synthesized by 3-(2-Aminoethylamino) propyltriethoxysilane and (2, 3-epoxypropyl) trimethylammonium chloride. Then the corresponding series of membranes based on pyridine functionalized polyvinyl alcohol (PVA-Py) with varying AESP content are prepared using sol-gel method. Obtained membranes show ion exchange capacities (IEC) ranging from 0.54 mmol·g−1 to 0.92 mmol·g−1, but the opposite trend of water uptakes (WU) from 123.97% down to 69.09% because of the formation of organic-inorganic network. The hybrid membranes also exhibit good thermal stability (>140 °C), excellent mechanical properties (25.37 MPa) and high OH− conductivity (9.63 × 10−2 S·cm−1, 80 °C). Compared with the commercial Nafion®-117 membrane, the prepared hybrid membrane performs a much lower methanol permeability (7.57 × 10−8 cm2·s−1 for prepared membrane, 2.00 × 10−6 cm2·s−1 for Nafion®-117 membrane, 3 M methanol solutions, 30 °C). Only 10.7% decreases in OH− conductivity can be observed in 6 M 80 °C NaOH solutions after 360 h immersions, exhibiting excellent alkaline stability. The highest peak power density of the single cell with 5 M KOH + 3 M methanol fuel is 52.56 mW·cm−2 at 80 °C and 0.2 MPa O2.

中文翻译：

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用于碱性燃料电池的溶胶-凝胶衍生二氧化硅/PVA-Py混合阴离子交换膜的制备和表征

摘要 铵官能化阴离子交换二氧化硅前驱体（AESP）由3-（2-氨基乙基氨基）丙基三乙氧基硅烷和（2，3-环氧丙基）三甲基氯化铵合成。然后使用溶胶-凝胶方法制备基于具有不同 AESP 含量的吡啶官能化聚乙烯醇 (PVA-Py) 的相应系列膜。所得膜的离子交换容量 (IEC) 范围为 0.54 mmol·g-1 至 0.92 mmol·g-1，但由于有机-无机物的形成，吸水量 (WU) 从 123.97% 下降至 69.09% 的趋势相反网络。混合膜还表现出良好的热稳定性 (>140 °C)、优异的机械性能 (25.37 MPa) 和高 OH− 电导率 (9.63 × 10−2 S·cm−1, 80 °C)。与商用 Nafion®-117 膜相比，制备的混合膜的甲醇渗透率要低得多（制备膜为 7.57 × 10−8 cm2·s−1，Nafion®-117 膜为 2.00 × 10−6 cm2·s−1，3 M 甲醇溶液，30 °C ）。在 6 M 80 °C NaOH 溶液中浸泡 360 小时后，仅观察到 OH− 电导率下降 10.7%，表现出优异的碱性稳定性。具有 5 M KOH + 3 M 甲醇燃料的单电池在 80 °C 和 0.2 MPa O2 下的最高峰值功率密度为 52.56 mW·cm-2。