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

聚合物电解质燃料电池的商业化需要具有高CO耐受性的铂阳极催化剂。本研究在碳负载Pt阳极催化剂表面覆盖二氧化硅层，以提高Pt催化剂的CO耐受性。二氧化硅包覆Pt催化剂具有较高的CO耐受性，其CO耐受性随二氧化硅层厚度的增加而逐渐提高。铂与二氧化硅的相互作用提高了材料的CO耐受性。此外，在Pt催化剂表面覆盖各种金属氧化物，以改善其催化性能。通过在铂催化剂上使用极薄的二氧化硅层，可以使铂催化剂均匀地被各种金属氧化物覆盖。

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.