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首页> 外文期刊>Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications >Highly durable Pt cathode catalysts for polymer electrolyte fuel cells; coverage of carbon black-supported Pt catalysts with silica layers
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Highly durable Pt cathode catalysts for polymer electrolyte fuel cells; coverage of carbon black-supported Pt catalysts with silica layers

机译：用于聚合物电解质燃料电池的高度耐用的Pt阴极催化剂;炭黑负载的Pt催化剂被二氧化硅层覆盖

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摘要

Carbon black-supported Pt (Pt/CB) catalysts that have been used at the cathode in state of the art polymer electrolyte fuel cell (PEFC) were covered with silica layers to improve the durability of the Pt catalysts under PEFC cathode conditions. The durability of silica-coated Pt/CB to potential cycling between 0.6 and 0.9 V (vs. reversible hydrogen electrode (RHE)) was strongly dependent on the thickness of the silica layers, i.e., the durability of Pt/CB improved after coverage with thick silica layers. However, the coverage of the whole surface of the Pt/CB catalysts with silica layers produced electrochemically inactive Pt catalysts. Silica-coated Pt/CB catalysts with an optimal silica layer thickness showed similar activity for the oxygen reduction reaction compared to Pt/CB catalysts without a silica coating, and they had excellent durability at the cathode in a PEFC single cell. Coverage with silica layers improved the durability of the Pt/CB cathode catalysts without a decrease in the catalytic activity for the oxygen reduction reaction.
机译：在现有技术的聚合物电解质燃料电池（PEFC）的阴极上使用的炭黑负载的Pt（Pt / CB）催化剂上覆盖有二氧化硅层，以提高Pt催化剂在PEFC阴极条件下的耐久性。涂有二氧化硅的Pt / CB对0.6至0.9 V（vs.可逆氢电极（RHE））的电势循环的耐久性在很大程度上取决于二氧化硅层的厚度，即，Pt / CB的Pt / CB覆盖后，其耐久性得以提高。厚的二氧化硅层。然而，Pt / CB催化剂的整个表面被二氧化硅层覆盖产生了电化学惰性的Pt催化剂。与没有二氧化硅涂层的Pt / CB催化剂相比，具有最佳二氧化硅层厚度的二氧化硅涂层Pt / CB催化剂对氧的还原反应具有相似的活性，并且它们在PEFC单电池中的阴极具有出色的耐久性。二氧化硅层的覆盖改善了Pt / CB阴极催化剂的耐久性，而不会降低氧还原反应的催化活性。

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