Preparation method and application of metal MOF-based composite material

Abstract

The invention discloses a preparation method and application of a petal-shaped composite material. The morphology of precursor nickel hydroxide is regulated and controlled by controlling the proportion of raw materials for synthesizing the precursor nickel hydroxide, a petal-shaped MOF-74@Ni (OH) 2 material with a larger specific surface area is synthesized in situ by replacing metal salt, and theapplication of the precursor nickel hydroxide in methanol oxidation reaction is explored by taking the precursor nickel hydroxide as a positive electrode catalyst material of the methanol oxidation reaction. The method comprises the following steps: synthesizing the precursor petal-shaped nickel hydroxide by taking urea and nickel sulfate as raw materials; and carrying out self-assembly synthesison the prepared nickel hydroxide and an organic ligand 2, 5-dihydroxy terephthalic acid in a DMF / H2O / EtOH solvent system to obtain the MOF-74@Ni (OH) 2 composite material. Meanwhile, on the basis ofthe synthesis route, the proportion of synthesis precursor raw materials of the urea and nickel sulfate is changed to regulate and control the morphology; according to the preparation method, the synthesis materials are synthesized into the petal-shaped nickel hydroxide, so that the overall morphology of the composite material is regulated and controlled, the synthesis materials are assembled intoa three-electrode system for testing the methanol oxidation performance, and through data analysis, the MOF-74-Ni (OH) 2 synthesized from the synthesized petal-shaped nickel hydroxide and organic ligands has better performance than pure MOF-74-Ni (OH) 2.

Description

technical field [0001] The invention relates to a method for preparing a metal MOF-based composite material and its application. By changing the ratio of synthetic precursor raw material urea and metal salt to synthesize hydroxide, the composite material is prepared as a catalyst electrode material and tested to show methanol oxidation reaction ( MOR) has excellent performance. Background technique [0002] The construction of functional porous or macroporous materials with novel structures and excellent performances has been an important direction that researchers in the field of materials have paid extensive attention to in recent decades. MOFs is the abbreviation of metal-organic framework compound (English name Metal orgaicFramework). This type of material is composed of organic building units and inorganic metal centers through coordination bonds, self-assembled and alternately connected to each other to form an infinitely extended network structure. organic-inorganic ...

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Problems solved by technology

At present, the noble metal Pt is considered to be the most active catalyst for methanol oxidation, but there are still some issues to be considered when designing an effective platinum-based catalyst: the high loading of platinum increases the cost of the fuel cell; the carbon-containing intermediate The adsorption of the product reduces the active site of the catalyst; due to the weak interaction between the metal-support, it leads to the loss and agglomeration of platinum nanoparticles, etc. These problems seriously hinder the commercialization of DMFC

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