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Proton conductivity of zirconium tricarboxybutylphosphonate/PBI nanocomposite membrane

机译:三羧基丁基膦酸锆/ PBI纳米复合膜的质子电导率

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摘要

The preparation process and proton transport properties of zirconium tricarboxybutylphosphonate Zr(O_3PC(CH_2)_3(COOH)_3)_2 (Zr(PBTC))/polybenzimidazole (PBI) composite membranes have been investigated with a view to developing a novel electrolyte for direct methanol fuel cells. A compacted Zr(PBTC) powder sample and a Zr(PBTC)/PBI composite membrane with 50 wt.% Zr(PBTC) content show conductivities of 6.74 x 10~(-2) S cm~(-1) and 3.82 x 10~(-3) S cm~(-1) at 200℃ under a fully humid condition, respectively. Post-sulfonation thermal treatment, which has a great effect on the ligand structure of PBI, gives a marked increase in the conductivity of the membrane by a factor of 2 in the same condition. This effect is mainly attributed to the proton transport via sulfonic acid groups bonded to the PBI unit.
机译:研究了三羧基丁基膦酸锆Zr(O_3PC(CH_2)_3(COOH)_3)_2(Zr(PBTC))/聚苯并咪唑(PBI)复合膜的制备工艺和质子传输性能,以期开发新型的直接甲醇电解质燃料电池。压实的Zr(PBTC)粉末样品和Zr(PBTC)/ PBI复合膜的Zr(PBTC)含量为50 wt。%时,电导率分别为6.74 x 10〜(-2)S cm〜(-1)和3.82 x 10在完全湿润的条件下,分别在200℃时〜(-3)S cm〜(-1)。磺化后热处理对PBI的配体结构有很大影响,在相同条件下,可使膜的电导率显着提高2倍。该作用主要归因于质子经由结合至PBI单元的磺酸基的传输。

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