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首页> 外文期刊>Journal of Applied Polymer Science >Polymer electrolyte membranes based on blends of sulfonated polysulfone and PEO-grafted polyethersulfone for low temperature water electrolysis
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Polymer electrolyte membranes based on blends of sulfonated polysulfone and PEO-grafted polyethersulfone for low temperature water electrolysis

机译：基于磺化聚砜和PEO接枝聚醚砜共混物的聚合物电解质膜，用于低温水电解

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摘要

Polymer electrolyte membranes based on blends consisting of polyethylene oxide (PEO) grafted polyether sulfone (PES-g-PEO) and sulfonated polysulfone (SPSF(Na)) are prepared and their electrochemical and mechanical properties are investigated with respect to water electrolysis operation. The prepared blends are amorphous; they exhibit high glass transition temperatures and high thermal stability, thus ensuring the dimensional stability under electrolysis cell operation. Because of the presence of the water soluble constituent PES-g-PEO, the prepared blend membranes show very high water uptakes, reaching up to 370 wt %. Membrane electrode assemblies are fabricated and evaluated in single cells demonstrating that proton conductivity depends on the PEO-g-PES content as well as the PEO molecular weight. Namely, the increased concentration of PES-g-PEO leads to increased number of charge carriers, thus result in enhanced ionic conductivity. The use of longer PEO units (MW 5000), due to their improved chain mobility, facilitates the fast proton conduction as well. The maximum proton conductivity value is achieved (1.4 × 10~(-2) S cm~(-1), 80°C) for the blend with the higher PEO-g-PES content (20 wt %) and the higher PEO molecular weight (5000). Under electrolysis cell operation, the above-mentioned membrane with the lower ohmic resistance shows the best performance, although it is still poor mainly due to the use of Pt as anode.
机译：制备了基于聚环氧乙烷（PEO）接枝聚醚砜（PES-g-PEO）和磺化聚砜（SPSF（Na））的共混物的聚合物电解质膜，并研究了它们在水电解操作中的电化学和机械性能。制备的共混物是无定形的。它们具有较高的玻璃化转变温度和较高的热稳定性，因此可确保在电解槽操作下的尺寸稳定性。由于存在水溶性组分PES-g-PEO，因此制备的共混膜显示出非常高的吸水率，达到高达370wt％。膜电极组件在单个电池中制造和评估，表明质子电导率取决于PEO-g-PES含量以及PEO分子量。即，PES-g-PEO的浓度增加导致电荷载流子数目增加，因此导致离子电导率增加。由于较长的PEO单元（MW 5000）改善了链的流动性，因此也有利于快速的质子传导。具有较高PEO-g-PES含量（20 wt％）和较高PEO分子的共混物可实现最大质子电导率值（1.4×10〜（-2）S cm〜（-1），80°C）重量（5000）。在电解池操作下，上述具有较低欧姆电阻的膜表现出最好的性能，尽管它仍然很差，主要是由于使用Pt作为阳极。

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