Scalable nano-architecture for stable near-blackbody solar absorption at high temperatures

Yifan Guo, Kaoru Tsuda, Sahar Hosseini, Yasushi Murakami, Antonio Tricoli, Joe Coventry, Wojciech Lipiński and Juan F. Torres ()
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Yifan Guo: Australian National University
Kaoru Tsuda: Nano Frontier Technology
Sahar Hosseini: Australian National University
Yasushi Murakami: Shinshu University
Antonio Tricoli: University of Sydney
Joe Coventry: Australian National University
Wojciech Lipiński: The Cyprus Institute
Juan F. Torres: Australian National University

Nature Communications, 2024, vol. 15, issue 1, 1-13

Abstract: Abstract Light trapping enhancement by nanostructures is ubiquitous in engineering applications, for example, in improving highly-efficient concentrating solar thermal (CST) technologies. However, most nano-engineered coatings and metasurfaces are not scalable to large surfaces ( > 100 m2) and are unstable at elevated temperatures ( > 850 °C), hindering their wide-spread adoption in CST. Here, we propose a scalable layer nano-architecture that can significantly enhance the solar absorption of an arbitrary material. Our electromagnetics modelling predicts that the absorptance of cutting-edge light-absorbers can be further enhanced by more than 70%, i.e. relative improvement towards blackbody absorption from a baseline value without the nano-architecture. Experimentally, the nano-architecture yields a solar absorber that is 35% optically closer to a blackbody, even after long-term (1000 h) high-temperature (900 °C) ageing in air. A stable solar absorptance of more than 97.88 ± 0.14% is achieved, to the best of our knowledge, the highest so far reported for these extreme ageing conditions. The scalability of the layer nano-architecture is further demonstrated with a drone-assisted deposition, paving the way towards a simple yet significant solar absorptance boosting and maintenance method for existing and newly developed CST absorbing materials.

Date: 2024
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DOI: 10.1038/s41467-023-44672-3

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