期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 207, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.solmat.2019.110331
关键词
AlCrSiO film; Solar selective absorber; Thermal stability; Nano-multilayer
资金
- National Natural Science Foundation of China [U1832127]
- Postdoctoral Innovation Talent Support Program [BX20190254]
- China Postdoctoral Science Foundation [2019M652704]
Solar selective absorbers are excellent candidates to improve the solar thermal conversion efficiency. However, the absorbers with thermal stability at high working temperatures are still lacking. Here, we reported a solar selective absorber based on nano-multilayered AlCrSiO films synthesized by a cathodic arc ion plating system. The absorber, consisted of a TiN IR reflective layer, two nano-multilayered AlCrSiO films, and a top amorphous oxide AlCrSiO layer, had high absorptance of 0.923-0.927 and low emittance of 0.160-0.193. To study the high temperature thermal stability, the absorber was annealed at 600-700 degrees C in air for 200 h. The variations in the optical performances and microstructures of the annealed absorber were characterized by UV-Vis-near IR spectrophotometer, FTIR, TEM, SEM, EDS, XRD, and Raman. The results indicated that the absorber had a thermal stability with a selectivity of 0.923/0.161 up to 650 degrees C in air for 200 h. The nano-multilayered structure of AlCrSiO films was highly stable when annealed at 650 degrees C. The amorphous AlCrSiO layer could form a dense oxide layer capping on the absorber surface, effectively limiting the oxygen diffusion into the inter absorber. Therefore, the AlCrSiO-based solar selective absorber with excellent thermal stability could be possibly applied to high temperature solar thermal conversion.
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