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Kinetic Study on Superior Performance of Silica-Coated Cathode Catalysts for PEFC

PEFC用二氧化硅包覆正极催化剂优异性能的动力学研究

基本信息

批准号：
23360350
负责人：
KISHIDA Masahiro
金额：
$ 3.16万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2011
资助国家：
日本
起止时间：
2011-11-18 至 2014-03-31
项目状态：
已结题

项目摘要

We have reported that supported Pt catalysts covered with silica layer showed extremely high durability for the cathode in PEFC, but the layer might limit reaction rate due to slow mass transfer within the silica layer. In this work we studied on the mass transfer in silica layer and on the reason for the superior durability of the coated catalyst. The structure of silica layer was successfully controlled by changing coating condition. The silica layer prepared using methyltriethoxysilane has larger pore size and exhibited both the high activity and high durability. The reason why the coating catalysts show high durability could not be revealed, but the interaction between metal surface and silica layer, or positive charge of silica layer might suppress the dissolution of Pt species during reaction. Finally, it was also found that the coated Pd-Co catalysts showed extremely high durability for the cathode in PEFC, as compared with uncoated catalysts.

我们报道过，覆盖有二氧化硅层的负载型 Pt 催化剂对于 PEFC 中的阴极表现出极高的耐用性，但由于二氧化硅层内的传质缓慢，该层可能会限制反应速率。在这项工作中，我们研究了二氧化硅层中的传质以及涂层催化剂具有优异耐久性的原因。通过改变涂覆条件成功地控制了二氧化硅层的结构。使用甲基三乙氧基硅烷制备的二氧化硅层具有较大的孔径，并表现出高活性和高耐久性。涂层催化剂表现出高耐久性的原因尚不清楚，但金属表面与二氧化硅层之间的相互作用或二氧化硅层的正电荷可能会抑制反应过程中 Pt 物质的溶解。最后，我们还发现，与未涂覆的催化剂相比，涂覆的 Pd-Co 催化剂对于 PEFC 中的阴极表现出极高的耐用性。