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

doi:10.15541/jim20160683

Abstract

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

CLC Number:

O643

LI Min, LUO Yuan, XU Wei-Jia, LIU Jia-Xiang. DMFC Anode Catalyst Fe₃O₄@Pt Particles: Synthesis and Catalytic Performanc[J]. Journal of Inorganic Materials, 2017, 32(9): 916-922.

Figures/Tables 10

Fig. 1 TEM image (a) and XRD pattern (b) of Fe3O4 particles

Fig. 2 TEM image of amino-coated Fe3O4 particles

Fig. 3 XPS spectrum and N1s XPS spectra of amino-coated Fe3O4

Fig. 4 XRD pattern (a) and TEM image (b) of Fe3O4@Pt nanoparticles

Fig. 5 XPS spectrum (a) and Pt4f XPS spectra (b) of Fe3O4@Pt particles

Fig. 6 EDS patterns of single Fe3O4@Pt nanoparticle (a) and multiple Fe3O4@Pt nanoparticles (b)

Fig. 7 Relationship between peak currents and scanning time of the Fe3O4@Pt catalysts

Fig. 8 The 101th’ and first cyclic voltammetry curves of glassy carbon electrode modified by Fe3O4@Pt (a) After 100 cycles, 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 and the first cyclic voltammetry curve; (b) After 100 cycles, the 101th’ cyclic voltammetry curve of glassy carbon electrode modified by new Fe3O4@Pt in 0.5 mol/L H2SO4+1 mol/L CH3OH aqueous solutions and the first cyclic voltammetry curve

Fig. 9 Relationship between peak current ip and v1/2 of Fe3O4@Pt in 0.5 mol/L H2SO4 +1 mol/L methanol aqueous solution

Fig. 10 Linear cyclic voltammetry curves of Fe3O4@Pt and Pt in 0.5 mol/L H2SO4+1 mol/L methanol aqueous solutions

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

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