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首页> 外文期刊>Journal of Applied Polymer Science >New organic-inorganic hybrid membranes based on sulfonated polyimide/aminopropyltriethoxysilane doping with sulfonated mesoporous silica for direct methanol fuel cells
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New organic-inorganic hybrid membranes based on sulfonated polyimide/aminopropyltriethoxysilane doping with sulfonated mesoporous silica for direct methanol fuel cells

机译：基于磺化聚酰亚胺/氨基丙基三乙氧基硅烷掺杂磺化中孔二氧化硅的新型有机-无机杂化膜，用于直接甲醇燃料电池

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摘要

A series of novel composite methanol-blocking polymer electrolyte membranes based on sulfonated polyimide (SPI) and aminopropyltriethoxysilane (APTES) doping with sulfonated mesoporous silica (S-mSiO_2) were prepared by the casting procedure. The microstructure and properties of the resulting hybrid membranes were extensively characterized. The crosslinking networks of amino silica phase together with sulfonated mesoporous silica improved the thermal stability of the hybrid membranes to a certain extent in the second decomposition temperature (250-400°C). The composite membranes doping with sulfonated mesoporous silica (SPI/APTES/S-mSiO_2) displayed superior comprehensive performance to the SPI and SPI/APTES membranes, in which the homogeneously embedded S-mSiO_2 provided new pathways for proton conduction, rendered more tortuous pathways as well as greater resistance for methanol crossover. The hybrid membrane with 3 wt % S-mSiO_2 into SPI/APTES-4 (SPI/A-4) exhibited the methanol permeability of 4.68 × 10~(-6) cm~2 s~(-1)at 25°C and proton conductivity of 0.184 S cm~(-1) at 80°C and 100%RH, while SPI/A-4 membrane had the methanol permeability of 5.16 × 10~(-6) cm~2 s ~(-1) at 25°C and proton conductivity of 0.172 S cm~(-1) at 80°C and 100%RH and Nafion 117 exhibited the values of 8.80 × 10 ~(-6) cm~2 s~(-1) and 0.176 S cm~(-1) in the same test conditions, respectively. The hybrid membranes were stable up to about 80°C and demonstrated a higher ratio of proton conductivity to methanol permeability than that of Nafion117.
机译：通过浇铸工艺制备了一系列基于磺化聚酰亚胺（SPI）和氨基丙基三乙氧基硅烷（APTES）的磺化介孔二氧化硅（S-mSiO_2）掺杂的新型复合甲醇阻隔聚合物电解质膜。所得杂化膜的微观结构和性能已得到广泛表征。在第二分解温度（250-400℃）下，氨基二氧化硅相与磺化中孔二氧化硅的交联网络在一定程度上改善了杂化膜的热稳定性。掺杂有磺化中孔二氧化硅的复合膜（SPI / APTES / S-mSiO_2）表现出优于SPI和SPI / APTES膜的综合性能，其中均匀嵌入的S-mSiO_2为质子传导提供了新的途径，随着以及对甲醇穿越的更大抵抗力。 SPI / APTES-4（SPI / A-4）中含有3 wt％S-mSiO_2的杂化膜在25°C和25°C时表现出4.68×10〜（-6）cm〜2 s〜（-1）的甲醇渗透率。质子在80°C和100％RH下的电导率为0.184 S cm〜（-1），而SPI / A-4膜在80°C时的甲醇渗透率为5.16×10〜（-6）cm〜2 s〜（-1） 25°C在80°C和100％RH下质子电导率为0.172 S cm〜（-1），Nafion 117的值为8.80×10〜（-6）cm〜2 s〜（-1）和0.176 S cm〜（-1）分别在相同的测试条件下进行。杂化膜在大约80°C的温度下是稳定的，与Nafion117相比，质子传导率与甲醇渗透率的比率更高。

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