Preparation method of metal-organic framework-coated ptni/ionic liquid/graphene material

Abstract

The invention discloses a preparation method for a PtNi / ionic liquid / graphene material coated with a metal organic framework, and belongs to the technical field of a catalyst. The preparation method comprises the steps of performing reduction of a graphene oxide, functional modification of the ionic liquid, and dual-metal reduction in an alkali condition to form a PtNi / IL<1>-IL<2> / graphene compound with a sandwich layer structure; and then coating the PtNi / IL<1>-IL<2> / graphene compound having the sandwich layer structure with the MIL-101(Cr) metal organic framework through a good coordination effect among Cr<3+> and graphene-surface-modified ionic liquid molecules and oxygen-containing functional groups on the surface of the graphene through a hydrothermal method to obtain the final product. Compared with the prior art, the preparation method is simple, the cost is relatively low, and the prepared material is excellent in electrochemical performance; and the prepared PtNi / ion liquid / graphene material can be used as a novel catalyst to be used for positive electrode methanol oxidization of a DMFC, and has a significant reference value for development of other higher-performance DMFC positive electrode catalysts.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of a metal-organic framework-coated PtNi / ionic liquid / graphene material. Background technique [0002] The research of direct methanol fuel cell (DMFC) anode catalyst has always been the focus of research in the field of catalysis. The preparation of an anode catalyst with low cost, low toxicity, easy preparation, long life and high catalytic activity plays a decisive role in the development of the fuel cell industry. role. At present, the main research on DMFC anode catalysts focuses on the search and morphology design of noble metal Pt alloys and non-Pt catalysts, and on the search and modification of conductive supports of catalysts on the other hand. For the first aspect of work, Pt alloy catalysts such as PtNi, PtFe, PtRu, PtCo, PtRuW, PtNiCr, etc., non-platinum catalysts such as PdNi, Mn 3 o 4 -CoO, etc., various catalysts emerge in end...

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Problems solved by technology

[0004] Graphene has a special 2D structure, has the advantages of large specific surface area, good electrical conductivity, stable physical and chemical properties, and high carrier mobility. Since its discovery in 2004, graphene has been favored in the field of catalysis, but Graphene is prone to irreversible agglomeration and difficult to disperse to form a homogeneous solution, which also limits its use as a metal catalyst carrier.

For the performance optimization of graphene, Li et al. have proposed to use graphene and Pt nanoparticles to form a sandwich structure catalyst for DMFC. This novel structure shows obvious advantages in methanol catalysis, but the oxygen-containing functional groups on the surface of graphene are reduced and single Metal catalysts, etc. cause catalyst poisoning resistance is not high, these defects still need to be improved

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