Pt/Au/Fe3O4的制备及其电化学性能

Preparation of Pt/Au/Fe3O4 nanocomposites and their electrocatalytic activities in methanol oxidation

  • 摘要: 以制得的纳米Fe3O4颗粒作为载体,用还原法将还原出的Au与Pt分别负载到Fe3O4颗粒表面,制得纳米Pt/Au/Fe3O4复合材料。对Pt/Au/Fe3O4进行紫外可见光吸收光谱、透射电子显微镜、X射线衍射及光电子能谱等物理表征,结果表明,Au与Pt均匀地沉积到了Fe3O4纳米颗粒表面。对纳米Pt/Au/Fe3O4复合材料进行循环伏安扫描,当H2PtCl6的加入量达到8 mL时,Pt/Au/Fe3O4催化性能最佳;正扫电流峰ip与扫描速率的平方根v1/2线性相关,Pt/Au/Fe3O4催化氧化甲醇的过程受扩散控制;对催化剂进行201次循环伏安扫描,催化剂仍然能保持较好的催化性能且稳定性良好。因此,所合成催化剂Pt/Au/Fe3O4是一种具有良好化学稳定性的阳极催化剂材料。

     

    Abstract: Pt/Au/Fe3O4 nanocomposites were prepared by the continuous reduction method, through loading Pt and Au on the surface of nano Fe3O4. The Pt/Au/Fe3O4 nanocomposites were characterized by UV-vis spectra, transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectrometer (XPS); their electrocatalytic activities in methanol oxidation were investigated. The results indicated that Au and Pt are uniformly deposited on Fe3O4 surface. The cyclic voltammograms of Pt/Au/Fe3O4 suggests that the best catalytic performance is achieved when the amount of H2PtCl6 added is 8 mL. Current peak ip is proportional to the square root of scanning speed (v1/2) and the catalytic methanol oxidation process is under the control of diffusion. The Pt/Au/Fe3O4 nanocomposites remain high active during the measurements of cyclic voltammograms for 201 times, suggesting that Pt/Au/Fe3O4 is a kind of anode catalyst materials with high chemical activity and stability.

     

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