Preparation and application of bimetal organic framework composite nitrogen-doped graphene catalytic material

Abstract

The invention discloses preparation and an application of a bimetallic organic framework composite nitrogen-doped graphene catalytic material. The preparation method comprises the following steps: by taking methanol as a solvent, adding nickel acetate tetrahydrate, cobalt nitrate hexahydrate and graphene into a methanol solution in proportion, uniformly stirring, slowly adding a small amount of dimethylimidazole for multiple times, continuously stirring, transferring a product into a refrigerator to induce precipitation after the reaction is complete, filtering, respectively washing with distilled water and ethanol, drying in vacuum to obtain a solid purple powder, and calcining by adopting temperature programming to obtain a MOF-derived cobalt nickel carbide / nitrogen-doped graphene composite catalytic material. The obtained composite catalytic material is high in specific surface area and extremely good in dispersity of metal particles, guarantees high catalytic activity, and shows excellent alcohol oxidation activity in a 1.0 M methanol and 0.5 M sulfuric acid mixed solution with the sweeping speed of 30 mV / s. The material can still keep 78.3% of the initial value after 1000 cycles, and shows very good stability.

Description

technical field [0001] The invention belongs to the technical field of fuel cell catalysts, and in particular relates to the preparation and application of a bimetallic organic framework composite nitrogen-doped graphene catalytic material. Background technique [0002] For decades, direct methanol fuel cells (DMFCs) have been used as energy converters for flexible electronics due to their high energy density, high conversion efficiency, easy transportation, and low pollution emissions. Oxidation of Methanol to CO 2 The pathway requires a C-H bond and contributes to the reaction that generates the residue. Generally speaking, the oxidation process of methanol has several steps such as proton stripping and electron stripping. The process of combining the products with the anode catalyst to form CO complexes will form catalytic poisons and reduce the active sites of the catalyst. In order to effectively catalyze the oxidation reaction of methanol, it is particularly importan...

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Problems solved by technology

[0004] Under the existing conditions, there are problems related to the inhomogeneous morphology of metal organic framework materials and the application limitations of material properties, such as: the preparation process of single metal MOF materials is easier to control the morphology, but the catalytic performance is not obvious, which is a major disadvantage of single metal MOF materials ; and by first preparing a single metal MOF material, and then recombining the second metal material, the dispersion of the nanoparticles of the second metal material is poor, and how the MOF material is evenly dispersed on the surface of nitrogen-doped graphene, etc.

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