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直接甲醇燃料電池PtSn/C催化劑對甲醇氧化的電催化活性

Electrocatalytic activity of DMFC PtSn/C catalyst for methanol oxidation

  • 摘要: 采用低溫固相反應法制備了直接甲醇燃料電池用PtSn/C陽極催化劑,采用XRD、TEM等測試方法對催化劑的晶體結構和粒徑大小進行了表征.結果表明:采用低溫固相反應法制備的PtSn/C催化劑和Pt/C催化劑均表現為Pt的fcc晶體結構;Sn的加入導致Pt的晶胞參數增大;與同法所制Pt/C催化劑相比較,PtSn/C催化劑中金屬Pt在碳載體上分布較均勻,金屬粒子的粒徑較小,平均粒徑約為4.8nm,從而具有更大的反應表面積.電化學測試表明,對于甲醇電氧化,PtSn/C催化劑具有比Pt/C催化劑更強的催化能力.

     

    Abstract: The PtSn/C catalyst was prepared by the low-temperature solid phase reaction method. X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM) were used to characterize the crystallinity and particle size of the catalyst. The results indicate that the PtSn/C and Pt/C catalyst prepared by the same low-temperature solid phase reaction method both have platinum fcc structure. The addition of Sn can increase the lattice parameter of Pt. Compared with the Pt/C catalyst prepared by the same method, the PtSn/C catalyst shows a higher dispersion and a smaller particle size and its mean particle size is about 4.8 nm, therefore the PtSn/C catalyst has a higher active specific surface area. The results of electrochemical measurements demonstrate that the PtSn/C catalyst has a better electrocatalytic activity for the methanol oxidation than Pt/C catalyst.

     

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