无机材料学报 ›› 2017, Vol. 32 ›› Issue (9): 916-922.DOI: 10.15541/jim20160683 CSTR: 32189.14.10.15541/jim20160683

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DMFC阳极催化剂Fe3O4@Pt的制备及其催化性

李 敏, 洛 园, 许伟佳, 刘家祥   

  1. (北京化工大学 材料电化学过程与技术北京市重点实验室, 化工资源有效利用国家重点实验室, 北京 100029)
  • 收稿日期:2016-12-14 修回日期:2017-03-13 出版日期:2017-09-30 网络出版日期:2017-08-29
  • 作者简介:李 敏(1964–), 女, 副教授. E-mail: limin9936@163.com
  • 基金资助:
    北京市自然科学基金(2142025)Beijing National Natural Science Foundation(2142025)

DMFC Anode Catalyst Fe3O4@Pt Particles: Synthesis and Catalytic Performanc

LI Min, LUO Yuan, XU Wei-Jia, LIU Jia-Xiang   

  1. (Beijing Key Laboratory of Electrochemical Process and Technology for Materials, The State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing,100029, China)
  • Received:2016-12-14 Revised:2017-03-13 Published:2017-09-30 Online:2017-08-29
  • About author:LI Min. E-mail: limin9936@163.com

摘要:

采用水热法制得粒径为150~300 nm、分散性良好的Fe3O4磁性内核颗粒, 经APTES对Fe3O4进行氨基化修饰后, 用NaBH4原位还原H2PtCl6制得Fe3O4@Pt核壳结构的DMFC阳极催化剂, 对其进行TEM、XRD、XPS、EDS和催化活性及稳定性表征, 结果表明: 制得的Fe3O4@Pt颗粒表面主要由Pt组成, 形成了完整包覆一层Pt的Fe3O4@Pt粒子, 颗粒粒径为200~300 nm, Fe与Pt的原子比近似为3:1; Fe3O4@Pt具有良好的稳定性, 在循环100圈后, Fe3O4@Pt修饰的玻碳电极在新配制的0.5 mol/L H2SO4+1 mol/L CH3OH溶液中循环第101圈的峰电流密度是第一圈的94.51%; 纯Pt的峰电流密度仅为Fe3O4@Pt的90.73%, Fe3O4和Pt之间存在电荷传递, 从而提高了Fe3O4@Pt的催化活性。因此Fe3O4@Pt有望取代Pt作为DMFC的阳极催化剂。

 

关键词: 四氧化三铁, 铂, 核壳结构, 甲醇催化氧化

Abstract:

Fe3O4 magnetic core particles was prepared by hydrothermal method with a particle size of 150-300 nm, which showed good dispersibility. After amination of Fe3O4 particles by APTES, combined with in situ reduction of H2PtCl6 with NaBH4, we obtained Fe3O4@Pt with core-shell structure, and used it as a DMFC anode catalyst. The composition, morphology and structure of Fe3O4@Pt were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDS). The electrocatalytic activities of Fe3O4@Pt were also investigated by cyclic voltammetry (CV). As a result, the surface of Fe3O4@Pt particles mainly composed of Pt. The particle size of Fe3O4@Pt particles is between 200 nm and 300 nm. Atomic ratio between Fe and Pt is about 3:1. The prepared Fe3O4@Pt particles have a good stability. After 100 cycles, the cycle peak current density of the 101th’ cyclic voltammetry curve of glassy carbon electrode modified by Fe3O4@Pt in fresh 0.5 mol/L H2SO4+1 mol/L CH3OH aqueous solutions is 94.51% of the first cyclic voltammetry curve. The peak current density of pure Pt is only 90.73% compared with that of Fe3O4@Pt. The charge transfer between Fe3O4 and Pt improves the catalytic activity Fe3O4@Pt. As a result, this work demonstrates the potential of Fe3O4@Pt catalyst to replace Pt as the anode of DMFC in the future.

Key words: Fe3O4, Pt, core-shell, the catalytic oxidation of methanol

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