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近年来,致力于Pt基电催化剂在燃料电池中的应用已取得显著成果.但随贵金属(如Pt)成本的增加,提高催化剂的活性以及降低负载量的需求也日益迫切.为此,作者合成并比较了纳米多孔Pt,PtRu及PtRuIr3种电催化剂.以扫描电镜(SEM)、能量色散谱(EDS)、X射线衍射(XRD)和X射线光电子能谱(XPS)表征水热法制得的纳米多孔电极.CO汽提实验和甲醇氧化反应测试上述纳米多孔材料的电催化活性.结果表明,添加Ir极大改善纳米多孔PtRu的活性.采用现场电化学FTIR光谱技术研究纳米多孔Pt,PtRu及PtRuIr电极上的甲醇氧化反应,以进一步揭示这种显著增强效应的成因.
In recent years, remarkable achievements have been made in the application of Pt-based electrocatalysts in fuel cells, but with the increase of the cost of noble metals (such as Pt), the need for increasing the activity of the catalyst and reducing the load is also increasingly urgent. The electrocatalysts with nanoporous Pt, PtRu and PtRuIr were compared and characterized by SEM, EDS, XRD and XPS. Porous electrode.CO stripping experiments and methanol oxidation reaction of the above nanoporous materials electrocatalytic activity.The results show that the addition of Ir greatly improve the activity of nanoporous PtRu.Using field electrochemical FTIR spectroscopy nanoporous Pt, PtRu and PtRuIr Methanol oxidation reaction on the electrode to further reveal the causes of this significant enhancement effect.