Polymeric proton conducting membranes for medium temperature fuel cells (110-160°C)
Polymeric proton conducting membranes for medium temperature fuel cells (110-160°C)
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DOI：
10.1016/s0376-7388(00)00635-9
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发表时间：
2001-04-15
影响因子：
9.5
通讯作者：
Bauer, B
中科院分区：
文献类型：
--
作者：
Alberti, G;Casciola, M;Bauer, B
在中温下具有良好质子传导性的稳定聚合物膜的获得对于甲醇PEM燃料电池的发展非常重要。鉴于这种应用，系统地研究了Nafion 117和磺化聚醚醚酮（S-PEEK）膜的电导率作为相对湿度（r.h.）在较宽温度范围内（80-160 ℃）。在高r.h.下发生溶胀/软化现象。这些值阻止了在某些温度以上的电导率测定。然而，当R.H.保持在低于80%的值，测量可高达160 ℃。结果表明，在低相对湿度下，Nafion是比S-PEEK更好的质子导体。值，特别是在温度低于120摄氏度。然而，电导率的差异随着r.h.的增加而变平。和温度在100 ℃、35% r.h. S-PEEK 2.48的电导率比Nafion的电导率低约30倍，两种膜在160 ℃和75% r.h.下达到相当的电导率（4 × 10（-2）S cm（-1））。讨论了聚合物的超强酸和结晶对电导率的影响，以及在中温燃料电池中使用Nafion和S-PEEK膜的可能性。(C)2001爱思唯尔科技有限公司。保留所有权利。
The availability of stable polymeric membranes with good proton conductivity at medium temperatures is very important for the development of methanol PEM fuel cells. In view of this application, a systematic investigation of the conductivity of Nafion 117 and sulfonated polyether ether ketone (S-PEEK) membranes was performed as a function of relative humidity (r.h.) in a wide range of temperature (80-160 degreesC). The occurrence of swelling/softening phenomena at high r.h. values prevented conductivity determinations above certain temperatures. Nevertheless, when r.h. was maintained at values lower than 80%, measurements were possible up to 160 degreesC. The results showed that Nafion is a better proton conductor than S-PEEK at low r.h. values, especially at temperatures lower than 120 degreesC. The differences in conductivity were, however, leveled out with the increasing r.h. and temperature. While at 100 degreesC and 35% r.h. the conductivity of S-PEEK 2.48 was about 30 times lower than the conductivity of Nafion, both membranes reached a comparable conductivity (4 x 10(-2) S cm(-1)) at 160 degreesC and 75% r.h. The effect of superacidity and crystallization of the polymers on the conductivity, as well as the possibility of using Nafion and S-PEEK membranes in medium temperature fuel cells, are discussed. (C) 2001 Elsevier Science B.V. All rights reserved.