Photocatalyst using semiconductor-carbon nanomaterial core-shell composite quantum dot and method for preparing the same

Patent metadata

Field	Value
Publication number	US-9821303-B2
Application number	US-201514640816-A
Country	US
Kind code	B2
Filing date	Mar 6, 2015
Priority date	Nov 20, 2014
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

The present invention relates to a photocatalyst using a semiconductor-carbon nanomaterial core-shell composite quantum dot and a method for preparing the same, more particularly to a microparticle in which a semiconductor-carbon nanomaterial core-shell composite quantum dot is self-assembled using 4-aminophenol, capable of improving photoelectrochemical response and photoconversion efficiency when used as a photocatalyst or a photoelectrode of a photoelectrochemical device, a photoelectrochemical device using the same and a method for preparing the same.

First claim

What is claimed is:

1. A photocatalyst comprising:
a composite containing semiconductor-carbon nanomaterial core-shell composite quantum dots self-assembled into microparticles;
wherein the quantum dots within the microparticles are interlinked together with 4-aminophenol in which amine and phenol groups of the 4-aminophenol respectively form amide and ester linkages with carboxylic groups of the carbon nanomaterial.

2. The photocatalyst according to claim 1 , wherein the semiconductor is selected from ZnO, WO 3 , SnO 2 , ZrO 2 , TiO 2 , CdS, CdSe and CdTe.

3. The photocatalyst according to claim 2 , wherein the semiconductor is ZnO or TiO 2 .

4. The photocatalyst according to claim 1 , wherein the carbon nanomaterial is selected from graphene, multi-layered graphene, carbon nanotube, and fullerene.

5. The photocatalyst according to claim 4 , wherein the carbon nanomaterial is graphene.

6. The photocatalyst according to claim 1 , further comprises a visible light absorbing material contained in the photocatalyst wherein the visible light absorbing material is selected from iron oxide, tungsten oxide, a cadmium complex, and bismuth vanadate.

7. The photocatalyst according to claim 6 , wherein the visible light absorbing material is iron oxide.

8. The photocatalyst according to claim 6 , wherein the visible light absorbing material is tungsten oxide.

9. The photocatalyst according to claim 6 , wherein the visible light absorbing material is the cadmium complex.

10. The photocatalyst according to claim 6 , wherein the visible light absorbing material is bismuth vanadate.

11. A photoelectrochemical device comprising:
an electrode substrate;
wherein the photocatalyst according to claim 1 is coated on the electrode substrate.

12. A solar cell comprising the photoelectrochemical device according to claim 11 .

13. A photocatalyst comprising:
a composite containing semiconductor-oxidized carbon nanomaterial core-shell quantum dots self-assembled into microparticles;
wherein the quantum dots within the microparticles are interlinked together with 4-aminophenol in which amine and phenol groups of the 4-aminophenol respectively form amide and ester linkages with carboxylic groups of the oxidized carbon nanomaterial.

14. The photocatalyst according to claim 13 , wherein the semiconductor is selected from ZnO, WO 3 , SnO 2 , ZrO 2 , TiO 2 , CdS, CdSe, and CdTe.

15. The photocatalyst according to claim 14 , wherein the semiconductor is ZnO or TiO 2 .

16. The photocatalyst according to claim 13 , wherein the oxidized carbon nanomaterial is selected from oxidized graphene, oxidized graphite, oxidized carbon nanotube, and oxidized fullerene.

17. The photocatalyst according to claim 16 , wherein the carbon nanomaterial is oxidized graphene.

18. The photocatalyst according to claim 13 , further comprising a visible light absorbing material selected from iron oxide, tungsten oxide, a cadmium complex, and bismuth vanadate.

19. A photoelectrochemical device comprising:
an electrode substrate;
wherein the photocatalyst of claim 13 is coated on the electrode substrate.

20. A photocatalyst comprising:
a composite containing ZnO semiconductor-oxidized carbon nanomaterial core-shell quantum dots self-assembled into microparticles;
wherein the quantum dots within the microparticles are interlinked together with 4-aminophenol in which amine and phenol groups of the 4-aminophenol respectively form amide and ester linkages with carboxylic groups of the oxidized carbon nanomaterial; and
a cadmium complex visible light absorbing material contained in the ZnO semiconductor-oxidized carbon nanomaterial core-shell quantum dots.

Assignees

• Korea Inst Sci & Tech

Inventors

• Son Dong Ick
• Park Jong Hyeok
• Bae Su Kang
• Kim Jung Kyu
• Chang Gee Woo

Classifications

• B01J37/08

  Heat treatment {(B01J37/0009, B01J37/0018 take precedence)} · CPC title

• B01J37/0215

  Coating · CPC title

• B01J35/39 Primary

  Photocatalytic properties · CPC title

• B01J21/18

  Carbon · CPC title

• B01J31/0201 Primary

  Oxygen-containing compounds · CPC title