Pt-Sn/碳微球的制备及电催化性能的表征
首发时间:2010-01-06
摘要:提高催化剂的电催化活性和抗CO中毒的能力是直接甲醇燃料电池(DMFC)催化剂性能研究的热点。在CVD法制备得到粒径均匀、分散度好的碳微球(Carbon Microspheres,以下简称CMS)的基础上,采用浸渍还原法,在乙二醇体系中制备出Pt-Sn/CMS复合材料,并通过扫描电子显微镜(SEM),X射线衍射(XRD),X射线光电子能谱(XPS),循环伏安对产物进行结构和性能的表征。结果表明:Pt-Sn/CMS复合材料中金属颗粒分布均匀,粒径大约为4nm,符合最佳催化要求。XRD和XPS测试表明Pt-Sn/CMS复合材料中有PtSn合金和SnO2形成。用循环伏安法比较发现Pt-Sn/CMS催化剂的电催化性能明显优于Pt/CMS。从结构上分析得出,PtSn合金和SnO2能够促进CO的氧化,从而抑制了Pt的CO中毒,提高了Pt-Sn/CMS催化剂的电催化活性。
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Preparetion and Electrocatalysis Activity of Pt-Sn/ Carbon Microspheres
Abstract:The improvement of electrocatalysis activity and CO oxidation are great attentions for electrocatalysts of direct methanol fuel cells (DMFC). PtSn nanoparticles were loaded on Carbon Microspheres(CMS) with impregnation-reduction method. The composition was characterized by field emission scanning electron microscope (SEM), X-ray diffraction(XRD), X-ray photoelectron spectroscopy (XPS) and cyclic voltammograms. XRD and XPS patterns reveal that the composition included the PtSn alloy and SnO2 and mean diameter of metal particles is about 4nm. Cyclic voltammograms show that the Pt-Sn/CMS display better catalytic activity for methanol oxidation compared to Pt/CMS. The results suggest that PtSn alloy and SnO2 can promote the CO oxidation, sequentially improve electrocatalysis activity of Pt-Sn/ CMS for methanol oxidation.
Keywords: Sn Carbon Microspheres(CMS) structure electrocatalysis activity
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