Thermal annealing characteristics of solar selective absorber coatings based on nano-multilayered MoOx films |
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| Affiliation: | 1. Research & Development Center for Eco-chemistry and Eco-materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, PR China;2. Hainan Academy of Environmental Sciences (Hainan Environmental Monitoring Center Station), Haikou 571126, PR China;1. College of Mechanical & Electrical Engineering, Shaanxi University of Science & Technology, Xi''an, 710021, China;2. School of Materials Science & Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Material, Shaanxi University of Science & Technology, Xi''an, 710021, China;3. School of Electronic Information and Artificial Intelligence, Shaanxi University of Science & Technology, Xi''an, 710021, China;1. Center for Condensed Matter and Material Physics, Beihang University, Beijing 100191, PR China;2. Université Clermont Auvergne, CNRS, SIGMA Clermont, Institut de Chimie de Clermont-Ferrand (ICCF), F-63000 Clermont-Ferrand, France |
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| Abstract: | Designing double metal-dielectric (cermet) solar selective absorber coatings (SSACs) often requires complex co-sputtering techniques with multiple targets. This inevitably limits the simple and low-cost industrial fabrication. Here, we develop novel nano-multilayered MoOx-based SSACs by simple and stable one-step reactive magnetron sputtering process using single molybdenum target. The proposed multilayer SSACs exhibit good solar absorptance of 0.93 and low thermal emittance of 0.06. Owing to the temperature-induced oxygen diffusion and oxidation phenomenon the as-sputtered SSACs have a poor thermal tolerance under air atmosphere, and after annealing at 200 °C for 150 h, the resulting absorptance is diminished from 0.93 to 0.90. However, the optical performance of the annealed SSAC is relatively stable in high-vacuum environment, even after annealing at 450 °C for 200 h, it still displays an ideal spectral selectivity of 0.92/0.07. With above properties, the resulting MoOx-based SSAC is a promising absorber for enduring thermal harvesting in solar vacuum collectors. |
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| Keywords: | Anti-reflection layer Magnetron sputtering Annealing |
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