利用溶胶-凝胶法与加温、加压-流延工艺成功地制备出锐钛矿与金红石2种TiO2的质子交换复合膜.通过XRD,FTIR,EDS和AFM方法研究了复合膜晶形信息、化合键信息、元素分布、表面粗糙度,并组装了燃料电池进行了电化学测试.实验表明:TiO2掺杂全氟磺酸树脂的复合膜能在干气的操作条件下自增湿发电,电化学稳定,最高功率密度超过1 W/cm2;而且发现在复合膜中掺杂物的晶形影响燃料电池的自增湿发电性能,在70℃,0.2 MPa,化学计量数为1.5的干H2/干O2操作环境下,锐钛矿型复合膜在0.55 V下的电流密度接近2 A/cm2,比金红石型复合膜增大了0.34A/cm2,表现出了优良的自增湿电化学性能.最后讨论了TiO2/PFSA复合膜的质子传递机理.
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