Improvement in CO tolerance of Pt anode catalysts by coverage with silica layers

具有高CO耐受性的Pt阳极催化剂已被要求用于聚合物电解质燃料电池的商业化。在本研究中，碳载铂阳极催化剂覆盖二氧化硅层，以提高铂催化剂的CO耐受性。SiO2包覆Pt催化剂表现出较高的抗CO能力，且随着SiO2层厚度的增加，其抗CO能力逐渐提高。Pt与SiO2之间的相互作用提高了材料的耐CO性能。此外，Pt催化剂被各种类型的金属氧化物覆盖，以改变其催化性能。通过在Pt催化剂上利用非常薄的二氧化硅层，可以用各种金属氧化物均匀地覆盖Pt催化剂。

Pt anode catalysts with high tolerance to CO have been required for commercialization of polymer-electrolyte fuel cells. In the present study, carbon-supported Pt anode catalysts were covered with silica layers to improve CO tolerance of Pt catalysts. Silica-coated Pt catalysts showed high tolerance to CO and their CO tolerance was gradually improved with the thickness of silica layers. The interaction between Pt and silica resulted in the improvement of CO tolerance. In addition, Pt catalysts were covered with various types of metal oxides in order to modify their catalytic performance. Pt catalysts could be uniformly covered with various metal oxides by utilizing very thin silica layers on the Pt catalysts.