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首页> 外文期刊>Journal of power sources >Performance of Pt-Co/C prepared by the selective deposition of Co on Pt as a cathode in PEMFCs
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Performance of Pt-Co/C prepared by the selective deposition of Co on Pt as a cathode in PEMFCs

机译：通过在PEMFC中将Co选择性沉积在Pt上作为阴极制备的Pt-Co / C的性能

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摘要

In this study, Co-modified Pt/C catalysts were prepared by chemical vapor deposition (CVD) of Co on Pt/C. The performance of these catalysts as a cathode in proton exchange membrane fuel cells (PEMFCs), evaluated by a half-cell test, was compared with that of catalysts prepared using the conventional impregnation (IMP) method. The activity of the catalysts for oxygen reduction reaction (ORR) changed showing a maximum with the amounts of added Co and temperatures used for annealing the catalysts. The amount of Co needed to produce the maximum activity was smaller for the catalysts prepared by CVD ((Co/Pt)_(CVD) =0.2) than those prepared using the IMP method ((Co/Pt)_(IMP) = 1.0). Furthermore, the maximum activity of the catalysts prepared by CVD was 1.5 times higher than for the catalysts prepared by IMP. The ORR activity of the IMP catalyst was degraded by 65% after the corrosion test for 6000 s, which was largely attributed to Co dissolution in the acidic solution, whereas the CVD catalyst showed only 36% degradation. The higher corrosion resistance of the CVD catalyst was attributed to the more intimate Co interactions with the Pt surface than in the catalyst produced using the IMP method.
机译：在这项研究中，Co修饰的Pt / C催化剂是通过Co在Pt / C上的化学气相沉积（CVD）制备的。将通过半电池试验评估的这些催化剂在质子交换膜燃料电池（PEMFC）中作为阴极的性能与使用常规浸渍（IMP）方法制备的催化剂的性能进行了比较。氧还原反应（ORR）催化剂的活性随添加的Co量和用于使催化剂退火的温度而显示出最大值。通过CVD（（Co / Pt）_（CVD）= 0.2）制备的催化剂产生最大活性所需的Co量比使用IMP方法制备的（（Co / Pt）_（IMP）= 1.0 ）。此外，通过CVD制备的催化剂的最大活性是通过IMP制备的催化剂的1.5倍。腐蚀试验持续6000 s后，IMP催化剂的ORR活性降低了65％，这主要归因于Co在酸性溶液中的溶解，而CVD催化剂仅显示36％的降解。与使用IMP方法生产的催化剂相比，CVD催化剂的较高耐腐蚀性归因于Co与Pt表面的紧密相互作用。

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