The University of the Basque Country (EHU) has taken a firm step forward in the field of solar thermal energy. Its research group on Thermophysical Properties of Materials has demonstrated that tiny structures called copper cobaltate nanoneedles, coated with zinc oxide, can absorb up to 99.5% of the sun’s light. sunlight.
This result surpasses in efficiency carbon nanotubes, widely used in other applications, but discarded for solar towers due to their poor resistance to heat and humidity. The new nanostructures analyzed by EHU, in addition to showing superior efficiency, resist extreme conditions, making them ideal candidates for solar receivers.
What changes in concentrating solar power technology
In a solar tower, hundreds of mirrors concentrate the sun’s rays onto a receiver located at the top of the structure. The key to the performance of these installations lies in the ability of the absorber material to capture as much radiation as possible.
Currently, materials such as black silicone achieve 95% absorption, but the Basque team’s new developments could take that figure even further. By coating the nanoneedles with zinc oxidethe absorption has been increased to 99.5%, a level that verges on total capture of incident light.
International collaboration and laboratory validation
This work has been carried out in collaboration with the University of California at San Diego, an institution that has already patented the original design of the nanoneedles. The results of this research have been published in the scientific journal
Thermal stability and the ability to absorb radiation in real conditions position this advance as a tangible alternative to improve the efficiency of solar thermal power plants. Although commercial use still depends on political and international investment factors, such as those associated with the U.S. Department of Energy, the scientific data are compelling.
New coatings and higher conductivity
EHU researchers are not stopping. They are currently developing additional coatings for these nanostructures to further optimize their optical properties and thermal conductivity. The aim is to maximize heat transfer and facilitate energy storage in molten salts. energy storage in molten saltsan already widespread method of conserving thermal energy during hours without sunshine.
This type of research makes a difference in the renewable energy landscape. renewable energies, especially in areas with high solar potential such as Andalusia, where these technologies are already being tested.especially in areas with high solar potential such as Andalusia, where these technologies are already being tested.
The EHU is thus consolidating its position as a key player in the race for solar energy. solar energy more efficient, more resilient and more capable of being integrated into the power grids of the future.
Source and photo: University of the Basque Country
