Structure, thermal stability and chromaticity investigation of TiB2 based high temperature solar selective absorbing coatings

Qiu, Xiao‐Yang; Gao, Xiang‐Hu; Zhou, Tianhong; Chen, Baohui; Lu, Jiazheng; Guo, Huixia; Li, Xiaoting; Liu, Gang

doi:10.1016/j.solener.2019.01.068

Cited by 42 publications

(16 citation statements)

References 23 publications

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“…Figure shows the color coordinates of the WO x film in CIE 1937 chromaticity diagram, and these films showed a wide range of color appearances, involving yellow, reddish, blue, and cyan, and the lightness of the WO x film at 1.5 Pa was higher than that at 0.6 Pa. The colored WO x films have a promising application in building integrations …”

Section: Resultsmentioning

confidence: 99%

Spectral properties and microstructure of sputtered WO_x films for solar conversion applications

Kong

Fan

Wang

et al. 2020

Surface & Interface Analysis

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Tungsten oxides (WO x ) films have gained promising attention in terms of selective solar absorption due to its high intrinsic absorption properties. We fabricated a series of single-layer WO x films on aluminum substrates by a magnetron sputtering system.The optical absorption properties of the film were investigated by spectrophotometer and ellipsometry. We found that the optical properties of the film were very sensitive to the change of the thickness. The result showed the highest α value can reach up 0.82 with the thickness of 26 nm at 0.6 Pa or 70 nm at 1.5 Pa, and both ε values was around 0.05, indicating the high spectral selectivity properties. The different reflectance evolutions presented a wide range of color appearances, such as yellow, reddish, cyan, and blue. Moreover, the surface morphologies and phase structures of single-layer WO x films were investigated by SEM, XRD, and Raman. A WO x /SiO 2 solar selective absorber coating indicated that the as-obtained WO x film was a promising application in solar-thermal conversion. K E Y W O R D Ssolar selective absorber coating, spectral properties, tungsten oxides, chromaticity

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Section: Resultsmentioning

confidence: 99%

Spectral properties and microstructure of sputtered WO_x films for solar conversion applications

Kong

Fan

Wang

et al. 2020

Surface & Interface Analysis

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“…The reflectance spectra of the coatings were acquired using a UV-Vis-NIR spectrophotometer (Shimadzu MPC3600) equipped with integrating sphere in the wavelength range 300-2500 nm and a Fourier transform infrared (FTIR) spectrophotometer (PerkinElmer Frontier) in the wavelength range 2.5-25 μm. Thereupon, the solar absorptance (α) and the thermal emittance (ε) were estimated using the following equations 18,19 :…”

Section: Coating Characterizationmentioning

confidence: 99%

“…[19][20][21] Also, these borides were combined with metals and dielectrics and fabricated into multilayer solar selective coatings. 16,18,22,23 These reports suggest that transition metal-based borides (TMBs) are suitable materials for solar absorbers.…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14] In recent years, the borides have also gained more attention. [15][16][17][18][19] The possible application of bulk borides, such as ZrB 2 , HfB 2 , TaB 2 , TiB 2 , and LaB 6 , have been reported lately. [19][20][21] Also, these borides were combined with metals and dielectrics and fabricated into multilayer solar selective coatings.…”

Section: Introductionmentioning

confidence: 99%

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Probing the spectrally selective property of NbB₂‐based tandem absorber coating for concentrated solar power application

2021

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Solar selective coating with good thermal stability is the primary requirement for a concentrated solar power (CSP) plant to function with better photothermal efficiency. In recent years, ultra-high-temperature ceramic-based coatings have been explored as potential materials for solar selective coatings. In this context, NbB 2 /Nb(BN)/Al 2 O 3 tandem absorber coating was designed to be fabricated on a stainless-steel substrate by the radio frequency magnetron sputtering of spark plasma sintered ceramic target. In the bulk form, the NbB 2 ceramic exhibits high solar absorptance (α = 0.756) and thermal emissivity (ε = 0.43), whereas the amorphous single NbB 2 coating exhibits α/ε = 0.716/0.13. Reactive sputtering of NbB 2 in nitrogen produced a semi-transparent coating with an optical bandgap of ∼2.80 eV and was used as the secondary absorber layer. Raman and X-ray photoelectron spectroscopy analyses reveal mild oxygen incorporation in the absorber layers. The developed SS/NbB 2 /Nb(BNO)/Al 2 O 3 tandem absorber exhibits a good solar absorptance of 0.950 and a moderate thermal emissivity of 0.15 at room temperature. The coatings exhibited good thermal stability when heated in vacuum for 5 h up to 700 • C, and the selectivity (α/ε) remains above 6. The present work shows the possibility of exploring NbB 2 -based tandem absorber coatings for CSP applications.

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“…As the world faces severe energy challenges [1], it is necessary to respond urgently by cutting greenhouse gas emissions in order to achieve the goals of the Paris Agreement on climate change [2,3]. The development and implementation of non-fossil energy technologies has become increasingly important [4].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Thermal Stability of Cu/TixSiyN/AlSiN Solar Selective Absorbing Coating

Zhang

et al. 2020

Materials

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An oxygen-free solar selective absorbing coating of Cu/TixSiyN/AlSiN was prepared on a Cu buffered stainless steel substrate by magnetron sputtering. This coating was prepared using a single target for each layer. A spectrophotometer, Fourier transform infrared spectrophotometer, scanning electron microscopy, X-ray diffractometer and atomic force microscopy were used to characterize the optical properties, crystalline structure, morphology and composition of these coatings. The coating of Cu/TixSiyN/AlSiN has good optical properties (average absorption of 0.941 and emittance of 0.058) and excellent thermal stability. The performance criterion (PC) is 0.0365, when the solar selective absorbing coating is heated in air at 200 °C for 1200 h.

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Structure, thermal stability and chromaticity investigation of TiB2 based high temperature solar selective absorbing coatings

Cited by 42 publications

References 23 publications

Spectral properties and microstructure of sputtered WO_x films for solar conversion applications

Spectral properties and microstructure of sputtered WO_x films for solar conversion applications

Probing the spectrally selective property of NbB₂‐based tandem absorber coating for concentrated solar power application

Microstructure and Thermal Stability of Cu/TixSiyN/AlSiN Solar Selective Absorbing Coating

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Structure, thermal stability and chromaticity investigation of TiB2 based high temperature solar selective absorbing coatings

Cited by 42 publications

References 23 publications

Spectral properties and microstructure of sputtered WOx films for solar conversion applications

Spectral properties and microstructure of sputtered WOx films for solar conversion applications

Probing the spectrally selective property of NbB2‐based tandem absorber coating for concentrated solar power application

Microstructure and Thermal Stability of Cu/TixSiyN/AlSiN Solar Selective Absorbing Coating

Contact Info

Product

Resources

About

Spectral properties and microstructure of sputtered WO_x films for solar conversion applications

Spectral properties and microstructure of sputtered WO_x films for solar conversion applications

Probing the spectrally selective property of NbB₂‐based tandem absorber coating for concentrated solar power application