Solar energy absorbing coatings and methods of fabrication

Patent metadata

Field	Value
Publication number	US-10184051-B2
Application number	US-201515125348-A
Country	US
Kind code	B2
Filing date	Mar 13, 2015
Priority date	Mar 13, 2014
Publication date	Jan 22, 2019
Grant date	Jan 22, 2019

Abstract

Methods, systems, and devices are disclosed for fabricating and implementing optically absorbing coatings. In one aspect, an optically selective coating includes a substrate formed of a solar energy absorbing material, and a nanostructure material formed over the substrate as a coating capable of absorbing solar energy in a selected spectrum and reflecting the solar energy in another selected spectrum. A concentrating solar power (CSP) system includes heat transfer fluids (HTFs); thermal energy storage system (TES); and solar receivers in communication with HTFs and including a light absorbing coating layer based on cobalt oxide nanoparticles.

First claim

What is claimed are techniques and structures as described and shown, including:

1. An optically selective coating, comprising:
a substrate including a solar energy absorbing material; and
a nanostructure material formed over the substrate to absorb solar energy in a selected spectrum and reflect the solar energy in another selected spectrum, wherein the nanostructure material includes a double layer structure, wherein a top layer of the double layer structure includes metal oxide nanoparticles of a first type, and wherein a bottom layer of the double layer structure includes metal oxide nanoparticles of a second type different from the first type, wherein a metal oxide nanoparticle of the first type is CuFeMnO 4 , and wherein a metal oxide nanoparticle of the second type is CuCr 2 O 4 .

2. The coating of claim 1 , wherein the top layer includes metal oxide nanoparticles of the first type embedded in a dielectric matrix material.

3. The coating of claim 2 , wherein the dielectric matrix material includes ceramic, glass, or silica.

4. The coating of claim 1 , wherein the nanostructure material includes nanorods or a core-shell structure coated with nanoparticles.

5. The coating of claim 4 , wherein the core-shell structure includes yttrium oxide (Y 2 O 3 ).

6. The coating of claim 1 , wherein the nanostructure material includes thermally resistant core-shell particles having semiconductor, metal and metal oxide as cores, wherein thermally resistant comprises remaining stable at high temperature operation which is from 400° C. to 750° C.

7. The coating of claim 1 , further comprising:
an antireflection layer disposed over the nanostructure material.

8. The coating of claim 1 , wherein the nanostructure material includes embedded hole patterns or polymer beads.

9. The coating of claim 1 , wherein at least one of the top layer or the bottom layer is a nonporous layer.

10. An optically selective coating, comprising:
a substrate including a solar energy absorbing material; and
a nanostructure material formed over the substrate, wherein the nanostructure material includes a double layer structure, wherein a top layer of the double layer structure includes CuFeMnO 4 nanoparticles embedded in a dielectric matrix material, wherein a bottom layer of the double layer structure includes CuCr 2 O 4 nanoparticles embedded in the dielectric matrix material, and wherein the top layer has a porosity of at least 20%.

11. The coating of claim 10 , further comprising:
an antireflection layer disposed over the nanostructure material.

12. The coating of claim 11 , wherein the antireflection layer includes MgF 2 .

13. The coating of claim 10 , the dielectric matrix material includes ceramic, glass, or silica.

14. The coating of claim 10 , wherein a size of the CuFeMnO 4 nanoparticles and a size of the CuCr 2 O 4 nanoparticles is less than 500 nm (nanometers).

Assignees

• Univ California

Inventors

• Jin Sungho
• Chen Renkun
• Liu Zhaowei
• Moon Jaeyun
• Kim Tae Kyoung
• Saders Bryan Van

Classifications

• C01P2004/84

  one phase coated with the other · CPC title

• F24S70/25

  Coatings made of metallic material · CPC title

• C01P2004/54

  Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension · CPC title

• C01G51/00

  Compounds of cobalt · CPC title

• C01P2002/85

  by XPS, EDX or EDAX data · CPC title