Triphasic metal oxide photoctalyst for hydrogen peroxide production from oxygen reduction and water oxidation

Patent metadata

Field	Value
Publication number	US-2023330639-A1
Application number	US-202318302044-A
Country	US
Kind code	A1
Filing date	Apr 18, 2023
Priority date	Apr 18, 2022
Publication date	Oct 19, 2023
Grant date	—

Abstract

The present disclosure relates to a triphasic metal oxide composite including a nanosheet and a core-shell structure, a photocatalyst including the same, and a method of preparing the same.

First claim

We claim:

1 . A composite, comprising:
a nanosheet including a cobalt oxide; and a core-shell particle including a core including an iron oxide and a shell including a titanium oxide, wherein the core-shell particle is located on the nanosheet.

2 . The composite of claim 1 ,
wherein the cobalt oxide includes at least one selected from (Co 2 (OH) 2 CO 3 ), Co 2 O 3 , and CoO.

3 . The composite of claim 1 ,
wherein the iron oxide includes at least one selected from Fe 3 O 4 , FeO, and Fe 3 O 3 .

4 . The composite of claim 1 ,
wherein the titanium oxide includes TiO 2 .

5 . The composite of claim 1 ,
wherein a diameter of the core-shell particle is 10 nm to 50 nm.

6 . The composite of claim 1 ,
wherein a thickness of the shell is 1 nm to 10 nm.

7 . The composite of claim 1 ,
wherein the nanosheet is in contact with the core of the core-shell particle.

8 . The composite of claim 1 ,
wherein the core absorbs visible light, and the shell absorbs ultraviolet light.

9 . The composite of claim 1 ,
wherein the nanosheet serves as a water oxidation site.

10 . The composite of claim 1 ,
wherein the core-shell particle serves as an oxygen reduction site.

11 . A photocatalyst, comprising the composite according to claim 1 .

12 . The photocatalyst of claim 11 ,
wherein the photocatalyst is used for production of hydrogen peroxide.

13 . A method of preparing a composite, comprising
performing hydrothermal reaction of a cobalt ion-containing precursor, an iron ion-containing precursor, and a titanium ion-containing precursor to form a composite, wherein the composite comprises a nanosheet including a cobalt oxide; and a core-shell particle including a core including an iron oxide and a shell including a titanium oxide.

14 . The method of claim 13 ,
wherein a temperature range of the hydrothermal reaction is 50° C. to 200° C.

15 . The method of claim 13 ,
wherein the hydrothermal reaction is one-pot reaction.

16 . The method of claim 13 ,
wherein the hydrothermal reaction is performed for 1 hour to 72 hours.

17 . The method of claim 13 ,
wherein the cobalt ion-containing precursor is a salt containing cobalt bivalent ion.

18 . The method of claim 13 ,
wherein the iron ion-containing precursor is a salt containing trivalent iron ion.

19 . The method of claim 13 ,
wherein the titanium ion-containing precursor is a salt containing tetravalent titanium ion.

20 . The method of claim 13 ,
wherein an average oxidation number of the cobalt ion is 0.67 or more.

Assignees

• Korea Advanced Inst Sci & Tech

Inventors

• Kang Jeung Ku
• Kim Keon-Han
• Choi Jong Hui

Classifications

• B01J2235/00

  Indexing scheme associated with group B01J35/00, related to the analysis techniques used to determine the catalysts form or properties · CPC title

• B01J35/393

  Metal or metal oxide crystallite size · CPC title

• B01J35/45

  Nanoparticles · CPC title

• B01J2235/30

  Scanning electron microscopy; Transmission electron microscopy · CPC title

• B01J23/745 Primary

  Iron · CPC title