Refractory solar selective coatings
Selective receiver coatings provide high performance for concentrated solar power applications. The solar selective coating provides high solar absorptivity (90% or greater) with low IR emissivity (0.1 or less) while maintaining stability at temperatures greater than 700° C. The coating comprises a composite of a mesoporous photonic matrix with a conformal optical coating. One example composite coating includes a mesoporous photonic coating comprising a plurality of particles having sizes between 100 nm and 2000 nm, and a conformal optical coating formed by Atomic Layer Deposition (ALD) that infiltrates the mesoporous structure of the photonic coating and comprises metal nanoparticles and an amorphous dielectric matrix.
1. A photonic construct comprising:
a photonic coating on a substrate, the photonic coating comprising a plurality of photonic coating nanoparticles having sizes between 100 nm and 2000 nm, the photonic coating having a mesoporous structure; and
an optical coating deposited on the photonic coating and infiltrating the mesoporous structure, the optical coating comprising a cermet having a plurality of optical coating nanoparticles consisting of Mo in a metallic state having sizes between 0.1 nm and 10 nm and an amorphous matrix of Al 2 O 3 , the optical coating comprising 10 ALD cycle percentage of Mo optical coating nanoparticles;
wherein the photonic construct has a solar absorptivity ≥90% and an IR emissivity ≤0.05 at a temperature above 720° C.
2. The photonic construct of claim 1 , wherein a solar efficiency solar absorptivity is ≥95% at a temperature above 720° C.
3. The photonic construct of claim 1 , wherein the photonic construct has a solar absorptivity ≥90% and an IR emissivity ≤0.05 at a temperature above 800° C.
4. The photonic construct of claim 1 , wherein the photonic construct has a solar absorptivity ≥90% and an IR emissivity ≤0.05 at a temperature above 1000° C.
5. The photonic construct of claim 1 , wherein the photonic construct has a thermal emissivity of less than 0.1.
6. The photonic construct of claim 1 , wherein the construct exhibits a levelized cost of electricity of equal to 6 ¢/kWhe at a temperature of greater than or equal to 720° C.
7. The photonic construct of claim 1 further comprising an adhesive substrate.
8. The photonic construct of claim 1 , wherein the plurality of optical coating nanoparticles have sizes of 1 nm to 2 nm.