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

Abstract

The invention discloses a preparation method of a porphyrin MOFs membrane. The preparation method comprises the following steps of forming a three-electrode system with two opposite inertial electrodes as a working electrode and a counter electrode respectively and a saturated calomel electrode as a reference electrode; dissolving porphyrin and inorganic metal salt in an organic solvent in sequence; stirring till a uniform solution is formed; using the uniform solution as an electrolyte; and powering the working electrode at a constant potential of -0.3-1.5 Vvs.SCE, that is, forming the porphyrin MOFs membrane on the surface of the working electrode. The invention further discloses application of the porphyrin MOFs membrane in electro-catalytic oxidation. According to the method, the porphyrin MOFs membrane is prepared through electrochemical reduction, the porphyrin MOFs membrane is synthesized and formed through one step, so that less time is taken, the operation is easy, requirements on equipment are low, the cost is low, the thickness of the porphyrin MOFs membrane is controllable, the prepared porphyrin MOFs membrane has regular appearance and takes on a network structure, andthe membrane can better combine with a 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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