DMFC阳极催化剂Fe3O4@Pt的制备及其催化性

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。

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

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.