Pt/Au/Fe<sub>3</sub>O<sub>4</sub>的制备及其电化学性能

洪春艳; 李敏; 刘家祥

Pt/Au/Fe₃O₄的制备及其电化学性能

北京化工大学材料科学与工程学院材料电化学过程与技术实验室, 北京 100029

详细信息

通讯作者:
刘家祥, Tel: 010-64446432, Fax: 010-64446432, E-mail: ljxpost@263.net。

中图分类号: O643
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出版历程
- 收稿日期: 2012-12-23
- 修回日期: 2013-04-11
- 刊出日期: 2013-09-30

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

College of Materials Science and Engineering, the Laboratory of Electrochemical Process and Technology for Materials, Beijing University of Chemical Technology, Beijing 100029, China

摘要

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i_p与扫描速率的平方根v^1/2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。
- Pt/Au/Fe₃O₄ /
- 阳极催化剂 /
- 甲醇还原剂 /
- 电化学性能
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 i_p is proportional to the square root of scanning speed (v^1/2) 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.
- Pt/Au/Fe₃O₄ /
- anode catalyst /
- methanol catalyst /
- electrochemical performance

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