Azobenzene-graphene metal coordination solar photothermal energy storage material and preparation thereof

Patent metadata

Field	Value
Publication number	US-11898083-B2
Application number	US-202117191863-A
Country	US
Kind code	B2
Filing date	Mar 4, 2021
Priority date	Jul 7, 2020
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

The present disclosure relates to an azobenzene-graphene metal coordination solar photothermal energy storage material based on metal coordination bonds and a preparation method thereof. The method comprises the following steps: preparing reduced graphene oxide; preparing an azobenzene-graphene material; and preparing an azobenzene-graphene metal coordination solar photothermal energy storage material: dispersing the prepared azobenzene-graphene material in DMF, dissolving a certain amount of metal compound in DMF, adding the DMF solution of the metal compound into the DMF solution of the azobenzene-graphene, taking out the precipitate, washing off metal ions which do not participate in coordination, and drying the obtained product to obtain the azobenzene-graphene metal coordination solar photothermal energy storage material. The present disclosure also relates to a method for improving the solar photothermal energy storage ability of a molecular solar energy fuel, comprising using an azobenzene-graphene metal coordination solar photothermal energy storage material.

First claim

What is claimed is:

1. An azobenzene-graphene metal coordination solar photothermal energy storage material represented by the following chemical formula:

wherein M═Mg, Ni, Zn, Cu or Ca; and
X═Fe or Al.

2. A method for preparing the azobenzene-graphene metal coordination solar photothermal energy storage material of claim 1 , the method comprising the following steps:
(1) preparing reduced graphene oxide: hydrothermally reacting an aqueous solution of graphene oxide (GO) prepared using Hummers method to obtain an aqueous solution of reduced graphene oxide (RGO);
(2) preparing an azobenzene-graphene material: preparing a hydrochloric acid solution of 4′-aminoazobenzene-4-sulphonic acid and a hydrochloric acid solution of NaNO2 respectively, adding the hydrochloric acid solution of NaNO2 dropwise into the hydrochloric acid solution of 4′-aminoazobenzene-4-sulphonic acid at 0-5° C. to form a diazonium salt; adding the diazonium salt into the aqueous solution of the reduced graphene oxide obtained in step (1) to react for a period of time; and washing the obtained product with water, NN-dimethylformamide (DMF) and ethanol until no characteristic absorption peak of azo appears in the UV absorption detection of the filtrate; and drying to obtain an azobenzene-graphene material; and
(3) preparing an azobenzene-graphene metal coordination solar photothermal energy storage material: dispersing the azobenzene-graphene material prepared in step (2) in DMF and dissolving an amount of a metal compound in DMF, adding the DMF solution of the metal compound into the DMF solution of the azobenzene-graphene, taking out the precipitate, washing off metal ions which do not participate in coordination, and drying the obtained product to obtain an azobenzene-graphene metal coordination solar photothermal energy storage material.

3. The method according to claim 2 , wherein in step (1), the aqueous solution of graphene oxide (GO) is hydrothermally reacted at 60° C.-160° C. for 2-48 h.

4. The method according to claim 2 , wherein in step (3), the metal compound used for coordination is MgCl 2 , NiCl 2 , ZnCl 2 , CuCl 2 , CaCl 2 , FeCl 3 , or AlCl 3 ; and, the coordination central ion in the azobenzene-graphene metal coordination solar photothermal energy storage material is a magnesium ion, a nickel ion, a zinc ion, a copper ion, a calcium ion, an iron ion, or an aluminum ion.

5. The method according to claim 2 , wherein in step (3), the molar ratio of the metal compound used for coordination to azobenzene-graphene is (0.1-20):1.

6. A molecular solar energy fuel, comprising the azobenzene-graphene metal coordination solar photothermal energy storage material according to claim 1 .

Assignees

• Univ Tianjin

Inventors

• Feng Yiyu
• Wang Hui
• Feng Wei
• Yu Huitao

Classifications

• C09K5/14 Primary

  Solid materials, e.g. powdery or granular · CPC title

• C07F3/003

  without C-Metal linkages · CPC title

• C07F3/02

  Magnesium compounds · CPC title

• C07F15/025

  without a metal-carbon linkage · CPC title

• C07F15/045

  without a metal-carbon linkage · CPC title