Linear double-branch azobenzene/graphene composite material and preparation method and application thereof

Abstract

The invention discloses a linear double-branch azobenzene / graphene composite material and a preparation method and application thereof. The linear double-branch azobenzene / graphene composite material is characterized in that linear double-branch azobenzene is grafted to single-layer graphene. The preparation method includes: performing diazotization on 4-aminobenzoic acid, allowing the processed 4-aminobenzoic acid to have reaction with aniline to generate azobenzene molecules, performing amino protection on the azobenzene molecules, and performing amidation on the azobenzene molecules and para amino azobenzene-4-sulfonic acid to obtain amino protected double-branch azobenzene; removing amino protection, and hybridizing and compositing the prepared double-branch azobenzene and reduced graphene oxide through diazotization to obtain the linear double-branch azobenzene / graphene composite material. The prepared double-branch azobenzene / graphene hybrid material has the advantages that the energy value and half-life period of the material are greatly improved as compared with those of azobenzene small molecules, the energy density of the material is stabilized at 158Wh / Kg, the half-life period of the material is prolonged to above 1000 hours, and the material is good in thermal stability and circulating performance and beneficial to solar heat storage.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a linear bibranched azobenzene / graphene composite material, a preparation method and an application thereof. Background technique [0002] In recent centuries, due to the development and utilization of fossil energy such as coal, oil, and natural gas, the world's economy and society have developed rapidly, and human demand for energy is increasing. However, these energy sources are facing a dilemma of increasing shortage, and human beings have caused serious damage and pollution to the environment while consuming these energy sources, such as acid rain, greenhouse effect, desertification, etc. These problems have seriously threatened human health and the green and sustainable world economy. Continuous development. [0003] Solar energy is a clean energy source, and strictly speaking, most of the energy used by human beings comes directly or indirectly from the sun. ...

AI Technical Summary

Problems solved by technology

Many researchers focus on photovoltaics, photocatalysis, and photothermalization, but so far no amazing results have been achieved in the field of solar thermal storage.

[0005] Azobenzene molecules have the characteristics of photoisomerization, can absorb light well between 350nm and 450nm, and the absorbed energy can be stored in a metastable structure, but pure azobenzene molecules have low energy density , the half-life is short, so the energy storage effect is not ideal

In recent years, although some researchers have composited azobenzene molecules with carbon materials, so far, no linear single-branch azobenzene containing substituents and hydrogen bond groups has been used to composite graphene. report

Images