Preparation and characterization of composite membranes composed of zirconium tricarboxybutylphosphonate and polybenzimidazole for intermediate temperature operation
Preparation and characterization of composite membranes composed of zirconium tricarboxybutylphosphonate and polybenzimidazole for intermediate temperature operation
复制标题
DOI：
10.1016/j.jpowsour.2004.03.080
复制
发表时间：
2005-01-04
影响因子：
9.2
通讯作者：
Yamazaki, Y
中科院分区：
文献类型：
--
作者：
Jang, MY;Yamazaki, Y
在2-膦酰基丁烷-1，2，4-三羧酸（PBTC）存在下，通过缓慢分解锆氟配合物，合成了三羧基丁基膦酸锆（Zr（O3 PC（CH 2）（3）（COOH）（3））（2），并以此制备了聚苯并咪唑（PBI）无机/有机复合膜。通过从锆（PBTC）颗粒在PBI溶液中的悬浮液中蒸发溶剂，形成了由嵌入在PBI中的锆（PBTC）颗粒组成的复合膜。含50重量%的复合膜Zr（PBTC）表现出均匀分布的颗粒在整个厚度，通过扫描电子显微镜确定。测量了压实Zr（PBTC）粉末和具有50重量%的基于PBI的膜的电导率。在200 ℃下，P-H2O/Ps = 1时，Zr（PBTC）分别为6.74 × 10（-2）和3.82 × 10（-3）S cm（-1）。用通过用磷酸处理获得的磷酸基团和用通过用硫酸后磺化热处理获得的磺酸基团官能化PBI提高了50重量%的质子传导率。在相同的测量条件下，Zr（PBTC）膜的厚度分别为5.24 × 10（-3）和8.14 × 10（-3）S cm（-1）。因此，Zr（PBTC）/PBI膜作为质子交换膜燃料电池（PEMFC）具有很大的潜力。(C)2004年由Elsevier B. V.出版
Zirconium tricarboxybutylphosphonate, Zr(O3PC(CH2)(3)(COOH)(3))(2), was synthesized by slowly decomposing zirconium fluorocomplexes in the presence of 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) to prepare inorganic/organic composite membranes based on polybenzimidazole (PBI). Composite membranes composed of zirconium tricarboxybutylphosphonate (Zr(PBTC)) particles embedded in PBI were formed by evaporating the solvent from a suspension of Zr(PBTC) particles in a PBI solution. Composite membranes with 50 wt.% Zr(PBTC) exhibited uniform distribution of the particles throughout the thickness, as ascertained by scanning electron microscopy. The conductivities measured for compacted Zr(PBTC) powder and PBI-based membranes with 50 wt.% Zr(PBTC) were 6.74 x 10(-2) and 3.82 x 10(-3) S cm(-1), respectively, at 200degreesC for P-H2O/Ps = 1. Functionalization of the PBI with phosphoric acid groups obtained by treatment with phosphoric acid and with sulfonic acid groups obtained by post-sulfonation thermal treatment with sulfuric acid improved the proton conductivity of 50 wt.% Zr(PBTC) membranes to 5.24 x 10(-3) and 8.14 x 10(-3) S cm(-1) under the same measurement conditions. Zr(PBTC)/PBI membranes thus have great potential as proton exchange membrane fuel cells (PEMFCs). (C) 2004 Published by Elsevier B.V.