Processing and optical behavior of dense (Hf,Zr)B2 solid solutions for solar energy receivers
Year: 2024
Authors: Barbarossa S., Locci AM., Cao GCM., Garroni S., Balbo A., Zanotto F., Sani E., Orrsch R.
Autors Affiliation: Univ Cagliari, Dipartimento Ingn Chim Meccan & Materiali, Un Ric Consorzio Interuniv Nazl Sci & Tecnol Mater, via Marengo 2, I-09123 Cagliari, Italy; Univ Sassari, Dipartimento Sci Chim Fis Matematiche & Nat, I-07100 Sassari, Italy; Univ Ferrara, Corros & Met Study Ctr Aldo Dacco, Engn Dept, G Saragat 4a, I-44122 Ferrara, Italy; INO Natl Inst Opt, CNR, Largo E Fermi,6, I-50125 Florence, Italy.
Abstract: While individual borides and, more recently, quinary High Entropy Transition Metal Borides have been investigated, the fabrication and characterization of bulk binary to quaternary solid solutions are barely explored. In this work, dense (Hf0.5Zr0.5)B-2 is produced by Spark Plasma Sintering (SPS) from powders prepared by Self-propagating High-temperature (SHS). SHS produced a multiphase product, whose secondary phases are fully converted into the desired diborides during the subsequent SPS step. Optical properties of (Hf0.5Zr0.5)B-2 are evaluated for the first time with focus on the possible use as novel high-temperature solar thermal absorber, by hemispherical reflectance measurements and calculation of solar absorptance, temperature-dependent spectral selectivity and absorber opto-thermal efficiency at various solar concentration ratios. To optimize the material, a chemically etched surface texture was realized to modify the optical properties. The etched sample showed a higher solar absorptance (0.71) and a lower spectral selectivity than the unetched one, with consequent higher opto-thermal efficiency at all temperatures for solar concentration ratios 1000 – 3000, while at lower concentration ratios and temperatures >1400 – 1600 K, the unetched sample shows the highest efficiency. These results show the promising properties of binary diborides for solar thermal applications.
Journal/Review: SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume: 268 Pages from: 112755-1 to: 112755-11
More Information: One of the authors (S.B.) performed his activity in the framework of the International Ph.D. in Innovation Sciences a nd Technologies at the University of Cagliari, Italy. This work has been developed within the framework of the project eINS- Ecosystem of Innovation for Next Generation Sardinia (cod. ECS 00000038) funded by the Italian Ministry for Research and Education (MUR) under the National Recovery and Resilience Plan (PNRR) -MISSION 4 COMPONENT 2, From research to business INVESTMENT 1.5, Creation and strengthening of Ecosystems of innovation and construction of Territorial R & D Leaders. A part of this study has been developed in the framework of the research activities carried out within the Project Network 4 Energy Sustainable Transition – NEST , Spoke 1, Project code PE0000021, funded under the National Recovery and Resilience Plan (NRRP) , Mission 4, Component 2, Investment 1.3- Call for tender No. 1561 of October 11, 2022 of Ministero dell’Universita’ e della Ricerca (MUR) ; funded by the European Union-NextGenerationEU. This work was also supported by Fondazione di Sardegna (2020) in the framework of the Advanced design of THErmodinamically-stable Nanocrystalline Alloys (ATHENA) project, CUP F75F21001370007. Thanks are due to CNR- INO technicians Mr. M. Pucci and Mr. M. D’Uva for technical assistance. The authors acknowledge the GAUSS-CeSAR (Centro Servizi d’Ateneo per la Ricerca) of the University of Sassari for X-ray diffraction analyses.KeyWords: Solid solution; Borides; Spark plasma sintering; Optical properties; Solar absorbers; Concentrated solar powerDOI: 10.1016/j.solmat.2024.112755Citations: 1data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-10-20References taken from IsiWeb of Knowledge: (subscribers only)Connecting to view paper tab on IsiWeb: Click hereConnecting to view citations from IsiWeb: Click here