Polychromic Al–AlN cermet solar absorber coating with high absorption efficiency and excellent durability

Wang, Chengbing; Shi, Jing; Geng, Zhongrong; Ling, Xiaoming

doi:10.1016/j.solmat.2015.07.049

Cited by 53 publications

(23 citation statements)

References 34 publications

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“…Currently, solar selective absorber coatings (SSACs), which are mainly used to harvest sunlight and convert it into a heat source, are being increasingly used in solar‐thermal applications, such as concentrated solar power (CSP) systems, solar thermal collectors (STCs), solar thermophotovoltaic (STPV) systems, solar‐heated clothes and cookers, flexible electronic devices, and solar steam generators (SSGs) . To boost the light‐to‐heat conversion efficiency, a range of novel SSACs have been designed and demonstrated to date, where double‐cermet‐based SSACs are believed to be the most efficient materials for enhanced light absorption due to the interference effect of cermet layers and plasmonic resonance effect of metal nanoparticles, for instance, Mo‐SiO 2 , W‐Al 2 O 3 , Mo‐Al 2 O 3 , W‐AlN, AuAl 2 ‐AlN, AgAl‐Al 2 O 3 , WNi‐YSZ, and so forth . In general, such traditional cermet absorbers have a thickness in the range of 150–400 nm and are fabricated with a complicated co‐sputtering process, which is not a low‐cost, flexible process for large‐scale production.…”

Section: Introductionmentioning

confidence: 99%

An Ultrathin, Nanogradient, and Substrate‐Independent WO_x‐Based Film as a High Performance Flexible Solar Absorber

et al. 2019

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Advances in flexible and wearable energy-related devices increase the need for highly efficient, low-cost, ultrathin solar selective absorber coatings (SSACs). Herein, the fabrication of nanogradient WO x -based SSACs with excellent properties, including a superior solar absorptance of 0.93, an outstanding thermal robustness of up to 300 C, and substrate independence, is reported. More importantly, the thickness of WO x -based SSACs is only approximately 100 nm, which is substantially thinner than all other reported SSACs. These features arise from the two intrinsically absorptive WO x layers on a thin nanoplasmonic W layer. The deposition process is based on self-doped reactive sputtering via limited tungsten oxidation due to a small amount of oxygen. The WO x -based SSACs on a flexible polyimide sheet demonstrate stable performance, strong adhesion, and bendable nature. The proposed self-doped fabrication process provides a new way to design cost-effective ultrathin SSACs to meet the demand for large-scale flexible energy harvesting and supply applications.

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Section: Introductionmentioning

confidence: 99%

An Ultrathin, Nanogradient, and Substrate‐Independent WO_x‐Based Film as a High Performance Flexible Solar Absorber

et al. 2019

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“…A variety of absorber coatings were studied and reported for the mid-temperature applications (100°C < T < 400°C) [11]. For example, Al-AlN coating with an absorptance of 0.942 and emittance of 0.066, exhibited high thermal stability at 260° in air for 210 hrs [12]. TiN/TiSiN/SiN coating, deposited on stainless steel substrate by magnetron sputtering is reported to have excellent selectivity (0.907/0.083) even after heat treatment at 200 °C in air for 300 hrs [13].…”

Section: Introductionmentioning

confidence: 99%

Angular solar absorptance and thermal stability of W/WAlN/WAlON/Al2O3-based solar selective absorber coating

Dan

Chattopadhyay

Barshilia

et al. 2016

Applied Thermal Engineering

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In this paper, we report the solar absorptance property of a new tandem absorber consisting of layers W/WAlN/WAlON/Al 2 O 3 that holds promise for solar thermal energy harvesting. The coating was prepared by DC/RF magnetron sputtering on stainless steel substrate. The performance of the film was investigated by measuring the reflectance spectra in the wavelength range of 250-2500 nm and most importantly by varying the incident angle from 18° to 68°. The effect of thermal annealing on the optical properties, microstructure and morphology of the solar selective absorber coating was also explored. The thermal annealing of the coating at 350°C till 550 hrs in air did not result in any significant change in the spectral properties of the absorber coating. The excellent thermal stability and wide range of angular absorptance of this multilayer coating indicate the potential for application as selective coating in mid temperature photothermal conversion systems.

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“…One of the most common coatings in high-temperature CSP systems is Pyromark 2500 [6], which loses a significant amount of heat through emission in the IR range due to the lack of high spectral selectivity in spite of high solar absorption and thermal stability at elevated temperatures [7]. Artificial composites or micro/nanostructured metamaterials have been recently developed as selective solar thermal absorbers [8][9][10][11][12][13][14] such as subwavelength gratings [15][16][17][18][19][20], nanocomposites [21] or nanoparticles [22], cermet [23][24][25], photonic crystals [26][27], and multilayers [28][29][30][31]. We recently reported the design and fabrication of an ultrathin multilayer selective solar absorber [30], namely metafilm absorber, which is thermally stable in air up to 600C, while thermal cycle testing revealed its long-term thermal stability at 400C in ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Solar Thermal Energy Conversion Enhanced by Spectrally-Selective Metafilm Absorber under Concentrated Solar Irradiation

Alshehri¹,

Ni²,

Taylor³

et al. 2020

ES Energy Environ.

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Concentrating solar power, particularly parabolic trough system with solar concentrations less than 50, requires spectrally selective solar absorbers that are thermally stable at high temperatures of 400C above to achieve high efficiency. In this work, the solar-thermal energy conversion performance of a selective multilayer metafilm absorber with excellent thermal stability is characterized along with a black absorber for comparison by a lab-scale experimental setup that measures the steady-state absorber temperature under multiple solar concentrations. Heat transfer analysis is employed to elucidate different energy conversion modes and validate the solar-thermal experiment. The solar-thermal efficiency was measured to be 38% from the experiment and projected to be 86% without parasitic heat losses for the selective metafilm-on-Si absorber at the temperature of 336C under 9.1 suns, in comparison with measured 30% and projected 55% efficiency for the black absorber at a lower temperature of 266C under the same solar concentration. In addition, the metafilm absorber deposited on the flexible cost-effective stainless steel foil achieves the solar-thermal efficiency 57% at a steady-state temperature of 371C under 10 suns during the lab-scale experiment with losses, while a highest efficiency of 83% was projected under the same conditions for practical solar thermal applications. The results here will facilitate the research and development of novel solar materials for high-efficiency solar thermal energy conversion.

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Polychromic Al–AlN cermet solar absorber coating with high absorption efficiency and excellent durability

Cited by 53 publications

References 34 publications

An Ultrathin, Nanogradient, and Substrate‐Independent WO_x‐Based Film as a High Performance Flexible Solar Absorber

An Ultrathin, Nanogradient, and Substrate‐Independent WO_x‐Based Film as a High Performance Flexible Solar Absorber

Angular solar absorptance and thermal stability of W/WAlN/WAlON/Al2O3-based solar selective absorber coating

High-Temperature Solar Thermal Energy Conversion Enhanced by Spectrally-Selective Metafilm Absorber under Concentrated Solar Irradiation

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Polychromic Al–AlN cermet solar absorber coating with high absorption efficiency and excellent durability

Cited by 53 publications

References 34 publications

An Ultrathin, Nanogradient, and Substrate‐Independent WOx‐Based Film as a High Performance Flexible Solar Absorber

An Ultrathin, Nanogradient, and Substrate‐Independent WOx‐Based Film as a High Performance Flexible Solar Absorber

Angular solar absorptance and thermal stability of W/WAlN/WAlON/Al2O3-based solar selective absorber coating

High-Temperature Solar Thermal Energy Conversion Enhanced by Spectrally-Selective Metafilm Absorber under Concentrated Solar Irradiation

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Product

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An Ultrathin, Nanogradient, and Substrate‐Independent WO_x‐Based Film as a High Performance Flexible Solar Absorber

An Ultrathin, Nanogradient, and Substrate‐Independent WO_x‐Based Film as a High Performance Flexible Solar Absorber