Preparation and characterization of phosphotungstic acid-derived salt/Nafion nanocomposite membranes for proton exchange membrane fuel cells
Preparation and characterization of phosphotungstic acid-derived salt/Nafion nanocomposite membranes for proton exchange membrane fuel cells
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DOI：
10.1016/j.jpowsour.2010.08.062
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发表时间：
2011-02-01
影响因子：
9.2
通讯作者：
Scrosati, B.
中科院分区：
文献类型：
--
作者：
Amirinejad, M.;Madaeni, S. S.;Scrosati, B.
制备并表征了Nafion/Cs2.5H0.5PW12O40纳米复合膜，作为高温低湿条件下质子交换膜燃料电池的替代材料。Cs2.5H0.5PW12O40固体酸颗粒（以下简称CsPWA）具有高表面积、高吸湿性和在水分子存在下产生质子的能力。结果表明，CsPWA颗粒的加入对质子交换膜的含水量、离子交换容量、热性能（TGA和DSC）、质子传导率和PEM燃料电池性能均有影响。纳米复合膜中出现了颗粒团聚和Nafion活性位点（磺酸基）覆盖现象。纳米复合材料膜在高温（110和120摄氏度）下的电导率高于纯Nafion，并且可能与纳米复合材料膜内的额外水和/或由CsPWA提供的额外表面功能位点有关。燃料电池的响应表明，在完全水合状态下，在较高的电流密度下，制备的MEA与纳米复合膜具有更好的响应相比，普通的Nafion。在部分水合电池中，在低和高电流密度下，观察到由纳米复合膜制备的MEA的上级性能。(C)2010 Elsevier BV保留所有权利。
Nafion/Cs2.5H0.5PW12O40 nanocomposite membranes are prepared and characterized as alternate materials of PEMFC operation at high temperature/low humidity. The Cs2.5H0.5PW12O40 solid acid particles (hereafter CsPWA) have the high surface area, the high hygroscopic property and the ability to generate proton in the presence of water molecules. The results of prepared membranes at three levels (0, 10 and 15%) indicate that the CsPWA particles have influence on the water content, ion exchange capacity, thermal properties (TGA and DSC), proton conductivity and PEM fuel cell performance. Particles agglomeration and Nafion active sites (sulfonic groups) covering are seen in the nanocomposite membranes. The conductivity of nanocomposite membranes at high temperatures (110 and 120 degrees C) is higher than plain Nafion and may be related to the additional water within the nanocomposite membrane and/or the additional surface functional site provide by CsPWA. The fuel cell responses show that in the fully hydrated state and at the higher current densities, the prepared MEAs with nanocomposite membranes possess better response compared with the plain Nafion. In partially hydrated cell, at both low and high current densities, the superior performance of the MEA prepared by nanocomposite membranes is observed. (C) 2010 Elsevier B.V. All rights reserved.