A kind of porphyrin mofs film and preparation method thereof, application in electrocatalytic oxidation

Abstract

The invention discloses a method for preparing a porphyrin MOFs film, which includes the following steps: using two opposing inert electrodes as working electrodes and counter electrodes, and a saturated calomel electrode as a reference electrode to form a three-electrode system, combining porphyrin and inorganic The metal salt is dissolved in the organic solvent in turn, stirred until a uniform solution is formed, and used as an electrolyte to energize the working electrode at a constant potential of -0.3~-1.5 V vs. SCE, that is, a porphyrin MOFs film is formed on the surface of the working electrode; the present invention The application of the porphyrin MOFs membrane in electrocatalytic oxidation is also disclosed. The present invention uses electrochemical reduction to prepare a porphyrin MOFs film, completing the synthesis and film formation of the porphyrin MOFs in one step, which is short in time, easy to operate, low in equipment requirements, low in cost, and has the advantage of controllable thickness of the porphyrin MOFs film. , the prepared porphyrin MOFs film has a regular morphology, a network structure, and a strong binding ability between the film and the substrate.

Description

technical field [0001] The invention belongs to the technical field of supramolecular metal organic chemistry, and in particular relates to a porphyrin MOFs film, a preparation method thereof, and an application in electrocatalytic oxidation. Background technique [0002] Metal-organic frameworks (MOFs) are organic-inorganic hybrid materials with intramolecular pores formed by the self-assembly of organic ligands and metal ions or clusters through coordination bonds. As a new type of solid porous material, MOFs have the advantages of large specific surface area, high porosity, adjustable function, adjustable host-guest interaction, and high stability. The fields of adsorption and separation of small molecules have potential application value. [0003] Porphyrin has become one of the important organic ligands of MOFs due to its good photosensitivity and catalytic properties, as well as good thermal and chemical stability. Porphyrin MOFs can not only give full play to the ex...

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Problems solved by technology

The LbL method is to alternately deposit the required solution on the functionalized substrate to obtain an ultra-thin, oriented, and thickness-adjustable thin film preparation method, but the prepared porphyrin MOFs thin film has a weak binding ability to the substrate and is easy to fall off.

The electrophoresis method is to first synthesize porphyrin MOFs with a certain shape, and then use a suitable voltage to move the material to the substrate. This method needs to synthesize porphyrin MOFs first, and then deposit them on the substrate. The process is cumbersome.

In the research of porphyrin metal organic framework materials, most of the synthesis of porphyrin MOFs materials use solvothermal method, although the use of solvothermal method can enhance the binding ability of porphyrin MOFs thin film and substrate, but the controllability is very limited

[0005] At present, although the research on MOFs polymers has achieved rapid development, there are still great challenges in the preparation of MOFs membranes. There are not many continuous and dense membranes that can be prepared, and there are very few studies on porphyrin MOFs thin films. It is even rarer to use it in the field of photocatalysis

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