Journal
SOLAR ENERGY
Volume 181, Issue -, Pages 88-94Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2019.01.068
Keywords
Titanium boride; Solar selective absorbing coatings; Structure; Thermal stability; Chromaticity
Categories
Funding
- Youth Innovation Promotion Association CAS [2018455]
- Key Research & Development Program in Gansu [18YF1GA125]
- National Natural Science Foundation of China [51402315]
- Major Subject of State Grid Corporation of China [5216A01600W0]
- GanSu Science and Technology Ministry [1604GKCA005]
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Transition metal titanium diboride (TiB2) is a promising material for the solar selective absorbing coatings due to its favorable spectral selectivity and thermal stability. In this research, spectrally selective TiB2/Al2O3 tandem absorber is deposited on stainless steel (SS), which exhibits a high solar absorptance (alpha(s) = 0.93) and a low thermal emissivity (epsilon = 0.11). In this tandem absorber, the TiB2 acts as the main absorber layer and the Al2O3 acts as an antireflection layer. The tandem absorber coating is systematically characterized by ultra-high resolution scanning electron microscope (SEM), UV-vis-NIR spectrophotometer, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and Micro-Raman techniques. The thermal stability in vacuum of the SS/TiB2/Al2O3 tandem absorber coatings is investigated in the temperature range of 400-800 degrees C for 2 h and 100 h, respectively. SEM and Raman spectra indicate that the change of surface morphology and chemical composition for the coating result in the degradation of optical performance. With the different annealed temperature, the SS/TiB2/Al2O3 tandem absorber coatings exhibit different color, which is further investigated using chromaticity diagram.
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