Graphene-metal organic framework composite material and its preparation method and application

Abstract

The invention discloses a graphene-metal organic framework composite material, and a preparation method and application thereof. The composite material includes graphene and a metal organic frameworkcompound. The graphene is three-dimensional porous graphene. The metal organic framework compound is uniformly grown in an internal pore structure of the three-dimensional porous graphene. The preparation method includes the steps of (1) preparing a three-dimensional porous graphene aerogel; (2) preparing a three-dimensional porous graphene aerogel containing a metal organic framework material precursor solution; and (3) preparing a graphene-metal organic framework composite material. The application includes applications as electrode materials, adsorbents, or catalysts. The graphene-metal organic framework composite material has the advantages of good conductivity, good capacitance performance, uniform properties, stable structure, high cycle service life, and the like. The preparation method is simple in process and low in cost, and can prepare a graphene-metal organic framework composite material with the controllable shape and pore structure and excellent product performance.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a graphene-metal organic framework composite material and its preparation method and application. Background technique [0002] Supercapacitor, also known as electrochemical capacitor, is a new type of energy storage device with performance between secondary batteries and traditional capacitors. It has higher power density than batteries, and higher specific capacitance and energy density than traditional capacitors. It has the advantages of long cycle life, high reversibility, and no pollution to the environment. In particular, it has a short charging time and can be applied to energy storage devices, power supply systems, and many electronic devices. According to different energy storage mechanisms, supercapacitors are mainly divided into two categories: one is electric double layer capacitors (EDLCs) with carbon materials as electrode materials, which s...

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Problems solved by technology

However, in the preparation of graphene-MOF composites, the method of simple hybrid co-growth is mainly used at present, which separates and disperses the graphene sheets in the metal-organic framework, and the metal-organic framework is still in the micron-scale In the presence of powder, the graphene sheets are isolated from each other, and it is difficult to control the structure of the composite material, which not only limits the excellent electrical conductivity of graphene, but also makes the metal-organic framework suffer from redox reactions (generating pseudocapacitance) due to its coordination bonds. The pulverization and decomposition due to the destruction of the composite material reduces the property stability and recycling performance of the composite material, which limits its application in supercapacitor electrode materials

At present, graphene-metal organic framework composites are only used in the storage and adsorption of gases or liquids.

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