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中文摘要：
采用磺化SiO2/Nafion自增湿膜作为质子交换膜,采用掺杂了纳米SiO2或经过磺化处理的SiO2的催化层作为阴极催化层,考察了饱和增湿条件下由自制质子交换膜和阴极催化层组成样品的接触角和质子电导率。在饱和增湿进气条件下考察了其对电池性能,电化学特性的影响,同时降低进气湿度,考察电池性能变化。结果表明,掺杂SiO2提高了催化层的亲水性;掺入纳米SiO2降低了阴极催化层的质子电导率,而掺入磺化SiO2提高了其质子电导率。在饱和增湿进气时,采用磺化SiO2/Nafion自增湿膜大幅地降低了电池的欧姆电阻。采用自增湿膜同时阴极催化层内掺入纳米SiO2降低了电池性能,而掺杂磺化SiO2电池性能有所提高。在干气进气条件下,不论是单独采用磺化SiO2/Nafion复合膜还是在阴极催化层加入纳米SiO2或者磺化处理过的SiO2,电池性能均有所提高。
英文摘要：
The contact angle and proton conductivity of the sample with sulfonated SiO2/Nafion self-humidifying membrane as proton exchange membrane and doping nanosized SiO2 or sulfonated SiO2 as cathode catalyst layer was researched.The effects of the sample on performance and electrochemical properties of the cells were analyzed,and the performance change of cells was studied when lowering the feed humidity.The results show that doping SiO2 can improve the hydrophilicity of the cathode catalyst layers,and different from doping nanosized SiO2,doping sulfonated SiO2 can improve the proton conductivity of the cathode catalyst layer.The ohimc resistance of the cells with sulfonated SiO2/Nafion self-humidifying membrane decreases greatly at 100% relative humidity.Contrary to sulfonated SiO2,the performance of the cell doping nanosized SiO2 with self-humidifying membrane declines.Both sulfonated SiO2/Nafion self-humidifying membrane and cathode catalyst layer with proper content of hydrophilic nanosized SiO2or sulfonated SiO2 can improve the cell performance at low humidity.
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