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首页> 外文期刊>Journal of Applied Polymer Science >Biocomposite proton-exchange membrane electrolytes for direct methanol fuel cells
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Biocomposite proton-exchange membrane electrolytes for direct methanol fuel cells

机译：用于直接甲醇燃料电池的生物复合质子交换膜电解质

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摘要

Poly(vinyl alcohol) (PVA)-amino acid (AA) biocomposite membranes are prepared by blending PVA with AAs such as glycine, lysine (LY), and phenyl alanine followed by in situ crosslinking with citric acid (CA) and explored as a new class of biocomposite membrane electrolytes for direct methanol fuel cells (DMFCs). CA crosslinks with PVA through esterification offers adequate chemical, thermal, and morphological stability thereby produces methanol-obstructing close-packed polymeric network. These biocomposite membranes are characterized in terms of mechanical, thermal, sorption, and proton-conducting properties. Hydrophilic nature of AA zwitterions significantly facilitates proton conduction and CA crosslinking mitigates methanol crossover through establishing appropriate balance between hydrophilic/hydrophobic domains. The rational design of membrane microstructure with proper arrangement of hydrophobic/hydrophilic domains is a key to enhance electrochemical selectivity of PVA-AA/CA biocomposite membranes. Biocomposite membrane comprising LY exhibits nearly threefold higher electrochemical selectivity in relation to PVA/CA blend membrane. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43514.
机译：聚乙烯醇（PVA）-氨基酸（AA）生物复合膜的制备方法是，将PVA与AA（例如甘氨酸，赖氨酸（LY）和苯基丙氨酸）混合，然后与柠檬酸（CA）原位交联，并作为一种用于直接甲醇燃料电池（DMFC）的新型生物复合膜电解质。 CA通过酯化作用与PVA交联可提供足够的化学，热和形态稳定性，从而产生阻碍甲醇的紧密堆积的聚合物网络。这些生物复合膜的特征在于机械，热，吸附和质子传导性能。 AA两性离子的亲水性质显着促进了质子传导，CA交联通过在亲水/疏水域之间建立适当的平衡而减轻了甲醇的交换。合理设计疏水/亲水结构域的膜微结构的合理设计是增强PVA-AA / CA生物复合膜电化学选择性的关键。相对于PVA / CA共混膜，包含LY的生物复合膜表现出近三倍的更高的电化学选择性。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43514。

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