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

Patent metadata

Field	Value
Publication number	US-2022010188-A1
Application number	US-202117191863-A
Country	US
Kind code	A1
Filing date	Mar 4, 2021
Priority date	Jul 7, 2020
Publication date	Jan 13, 2022
Grant date	—

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 an azobenzene-graphene metal coordination solar photothermal energy storage material 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 NaNO 2 respectively, adding the hydrochloric acid solution of NaNO 2 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, N,N-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 a certain 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 (2), a coordinating group on the phenyl ring or pyridyl ring opposite to the amino group in the azo compound is a sulphonic acid group, a phosphoric acid group, carboxyl, hydroxyl, amino, nitro, a carbonic acid group, an ester group or an amide group.

5 . 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 ; that is, 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.

6 . 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.

7 . 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 according to claim 1 .

Assignees

• Univ Tianjin

Inventors

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

Classifications

• Y02E10/40

  Solar thermal energy, e.g. solar towers · CPC title

• F28D20/003

  using thermochemical reactions · CPC title

• F24S60/20

  using chemical reactions, e.g. thermochemical reactions or isomerisation reactions · CPC title

• C09K5/16 Primary

  Materials undergoing chemical reactions when used · CPC title

• C07F15/025

  without a metal-carbon linkage · CPC title