Preparation of high catalyst utilization electrodes for polymer electrolyte fuel cells.
Preparation of high catalyst utilization electrodes for polymer electrolyte fuel cells.
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DOI：
10.1021/la060671w
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发表时间：
2006-06
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影响因子：
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通讯作者：
Jung-Min Song;Shinsuke Suzuki;H. Uchida;Masahiro Watanabe
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文献类型：
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作者：
Jung-Min Song;Shinsuke Suzuki;H. Uchida;Masahiro Watanabe
我们开发了一种高催化剂利用率的聚合物电解质燃料电池电催化层的新制备工艺。以高比表面积炭黑(Pt/CB)和Nafion离聚体溶液为载体的工业铂催化剂在200℃的高压灭菌器中加热，然后淬火形成混合物的墨水。结果表明，用这种新型催化剂墨水制备的阴极具有很高的性能，即催化剂利用率高，气体扩散系数提高。微观结构分析表明，高压釜处理促进了Nafion离聚体有效地引入到铂/炭黑团聚体的初级孔隙中，其中约90%的铂催化剂被负载在其中。扫描电子显微镜观察表明，与传统的球磨机混合方式相比，Nafion离聚体在铂/炭黑团聚体内的分布更加均匀。
We have developed a novel preparation procedure for an electrocatalyst layer with high utilization of catalyst for polymer electrolyte fuel cells. A commercial Pt catalyst supported on high surface area carbon black (Pt/CB) and Nafion ionomer solution was heated in an autoclave at 200 degrees C, followed by quenching to form the ink of the mixture. It was found that the cathode prepared with the new catalyst ink exhibited very high performance, i.e., high catalyst utilization and improved gas diffusivity. The microstructure analysis indicated that the autoclave treatment promoted an effective introduction of Nafion ionomer into primary pores of Pt/CB agglomerates, in which ca. 90% of Pt catalysts were supported. It was clearly observed by scanning transmission electron microscopy that Nafion ionomer was distributed more uniformly inside Pt/CB agglomerates, compared with those simply mixed with a ball mill in a conventional manner.