High-temperature and abrasion-resistant metal-insulator-metalmetamaterials
Materials Today Energy
Selective solar absorbers (SSAs) with high performance are the key to concentrated solar power systems.Optical metamaterials are emerging as a promising strategy to enhance selective photon absorption,however, the high-temperature stability (>500 C) remains as one of the main challenges for practical applications. Here, a multilayered metamaterial system (Al2O3/W/SiO2/W) based on metal-insulator-metal Fabry-P erot resonance effect has been demonstrated with high solar absorptance over 92%, low
thermal emittance loss below 6% (100 C blackbody), and significant high-temperature thermal stability:it has been proved that the optical performance remains 94% after 1-h thermal annealing under ambient environment up to 500 C, and 94% after 96-h thermal cycle test at 400 C. Outdoor tests demonstrate
that a peak temperature rise (193.5 C) can be achieved with unconcentrated solar irradiance and surfaceabrasion resistance test yields that SSAs have a robust resistance to abrasion attack for engineering applications.
SSAs, optical materials,