Titanium composite PBI-based membranes for high temperature polymer electrolyte membrane fuel cells. Effect on titanium dioxide amount
Titanium composite PBI-based membranes for high temperature polymer electrolyte membrane fuel cells. Effect on titanium dioxide amount
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DOI：
10.1039/c1ra01084k
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发表时间：
2012-01-01
期刊：
影响因子：
3.9
通讯作者：
Lobato, Justo
中科院分区：
文献类型：
--
作者：
Javier Pinar, F.;Canizares, Pablo;Lobato, Justo
研究了在聚苯并咪唑膜中分散不同量的微米级二氧化钛(锐钛矿型)对其用作高温聚合物电解质膜燃料电池电解质的影响。所有的膜都是由相同分子量的聚合物浇铸而成的。对膜进行了物理化学和电化学表征。从不同二氧化钛加入量的膜的研究来看，作为电解液的复合膜的性能最好，其填充量最低。与标准复合膜和标准复合膜相比，质量分数为2%的复合膜吸酸量较大(吸酸量：2.42g(酸)g(膜)~(-1))，滤出量(残酸量：0.78g(酸)g(膜)~(-1))低。由于具有最大的酸和水吸收能力，2%的TiO2PbI也表现出最高的离子电导率(0.043 S cm(-1))，在燃料电池中测得。燃料电池测量和稳定性测试(.140h)，并与标准的聚苯并咪唑燃料电池进行了比较。二氧化钛-PBI复合膜的性能最好，在175℃下的功率密度达到450 mW cm(-1)，而且在我们的操作条件下，复合材料也表现出最好的稳定性。因此，复合膜的欧姆电阻增加的斜率为0.009 m欧米伽cm(2)h(-1)，极化电阻为1.17m欧米伽cm(2)h(-1)，比标准膜低2倍。当燃料电池在高温下运行时，引入无机填料的好处已经被强调。
The influence of different amounts of micro-sized titanium dioxide (anatase crystalline variety) dispersed into a polybenzimidazole membrane has been studied for its use as an electrolyte in high temperature polymer electrolyte membrane fuel cells. All of the membranes were cast from a polymer with the same molecular weight. The membranes were physicochemically and electrochemically characterized. From the membranes studied with different amounts of TiO2, the membrane that provided the best properties for its use as an electrolyte was the composite one which contained the lowest amount of filler. The composite membrane with 2 weight percent of the filler absorbed larger (absorbed acid: 2.42 g(acid) g(membrane)(-1)) and leached lower (remaining acid: 0.78 g(acid) g(membrane)(-1)) amounts of acid than the other composite and standard one. Because it has the largest acid and water absorption capability, the 2% TiO2-PBI showed also the highest ionic conductivity (0.043 S cm(-1)), measured out of the fuel cell. Fuel cell measurements and also stability tests (. 140 h) were made for the composite membrane with 2% of the filler and the results were compared with a standard polybenzimidazole fuel cell. The TiO2-PBI composite membrane showed the best performance and achieved a power density of 450 mW cm(-1) at 175 degrees C. Moreover, the composite also showed the best stability under our operation conditions. Thus, the slope of the increase in the ohmic resistance of the composite membrane was 0.009 m Omega cm(2) h(-1) and the polarization resistance was 1.17 m Omega cm(2) h(-1) which was two times lower than that of the standard membrane. The benefit of inorganic filler introduction when the fuel cell operates at high temperature has been highlighted.