直接涂膜技术用于质子交换膜燃料电池膜电极制备 (Ⅱ)

DIRECTLY PRINTING CATALYST ON MEMBRANE TECHNIQUE FOR PEMFC(Ⅱ)

研究了直接涂膜过程中 ,催化剂液组成对电池性能的影响 .异丙醇在催化剂墨水中起到溶剂和造孔剂的作用 ,当催化剂墨水中催化剂、异丙醇的质量比为 1∶10时电池性能最好 .Nafion是催化剂层中良好的黏结剂和质子传导载体 .由于直接涂膜 ,使Nafion液与Nafion膜直接接触 ,从而增加了质子传导性 .实验结果表明 ,最佳的Nafion含量 (干基 )为NFP =33% .通过对不同金属含量的Pt/C催化剂的研究发现 ,金属含量不同 ,异丙醇和Nafion的最优含量亦随之改变 .考察了催化剂层不同制备工艺对电池性能的影响 ,表明催化剂层数越多电池性能越好 。

The effect of each composition in catalyst ink on the performance of fuel cell was studied with the catalyst layer prepared by the directly printing catalyst on membrane technique.Isopropanol was the solvent and pore forming agent in catalyst ink.When the ratio of catalyst and isopropanol in catalyst ink was equal to about 1∶10, the performance of fuel cell was the best.Nafion was used both as a good binder and proton conductor in the catalyst layer.For the directly printing technique,direct application apparently improves the interfacial continuity between the Nafion ionomer in membrane and the Nafion ionomer in the catalyst layer.It was shown that the optimum content of dry Nafion (NFP) was about 33%.The effect of different Pt contents of Pt/C catalysts on the performance of fuel cell was investigated, and the optimum content of isopropanol and dry Nafion were determined based on different catalysts respectively.Finally the effect of different catalyst layers on the performance of fuel cell was studied.The more the catalyst layers,the better the performance of fuel cell with minor difference between catalysts.