High-Performance Spectrally Selective Absorber Using the ZrB 2 -Based All-Ceramic Coatings

ACS Appl. Energy Mater.

et al. 2022

The development of high-temperature-tolerance solar selective absorbing coatings (SSACs) is beneficial to improve the conversion efficiency of concentrated solar power. In the present work, a TiN/Mo/WN x -Si 3 N 4 bilayer/SiO 2 cermet-based SSAC was developed, which was deposited on different substrates by magnetron sputtering. The designed WN x -Si 3 N 4 SSAC exhibits a high solar absorptivity of 0.952, accompanied by a relatively low emissivity of 0.059 at 25 °C and 0.134 deduced at 600 °C. Moreover, the WN x -Si 3 N 4 SSAC deposited on a stainless-steel (SS) substrate shows great thermal stability at 650 °C in vacuum. The solar absorptivity shows a slight decrease from 0.952 to 0.939 and the emissivity at 25 °C decreases from 0.059 to 0.045 after being annealed at 650 °C in vacuum. Furthermore, when being annealed at 700 °C in vacuum, the WN x -Si 3 N 4 SSAC deposited on the quartz glass substrate still keeps stable, but the coating on the SS substrate is dramatically destroyed. A comprehensive failure analysis was conducted utilizing FT-IR, SEM, Raman, and XPS characterizations. The degradation of the WN x -Si 3 N 4 SSAC deposited on the SS substrate at 700 °C is caused by the severe elemental diffusion between the absorbing layers and the antireflection layer. Moreover, the cracks induced by the thermal stress provide rapid channels for elemental diffusion.

Section: Resultsmentioning

confidence: 79%

Optical Performance, Thermal Stability, and Failure Analysis of the WN_x-Si₃N₄ Multilayer Solar Selective Absorbing Coatings

ACS Appl. Energy Mater.

et al. 2022

“…Wang et al designed a all‐ceramic SSAC based on ZrB 2 with a quasioptical microcavity (QOM) structure. [ 38 ] The SSAC achieved a high solar absorptivity of 96.5% and a low thermal emissivity of 16%. Notably, the SSAC can endure 500 °C annealing treatment for 200 h in air and 800 °C annealing treatment for 200 h in vacuum.…”

Section: Recent Advances In Ssasmentioning

confidence: 99%

mentioning

confidence: 99%

Solar Selective Absorber for Emerging Sustainable Applications

Zhang

Adv Energy and Sustain Res

Shi

et al. 2022

Solar selective absorbers (SSAs) possess high sunlight absorption (300–2500 nm) and low infrared thermal radiative losses (2.5–25 μm), which are undoubtedly the best choice for photothermal conversion process, and SSAs have been widely used in concentrating solar power, solar water heating, and solar drying. Recently, to promote the realization of “double carbon” goal, SSAs have received widespread attentions, many emerging sustainable applications have been developed. In this review, the recent developments of SSAs and their latest sustainable applications in solar‐driven seawater desalination, multistage solar desalination, atmospheric water harvesting (AWH), wastewater treatment, solar thermophotovoltaics (STPVs), hybrid photovoltaic‐thermal (HPVT), solar‐thermoelectric generators (STEG), personal thermal management (PTM), photothermal catalysis, photothermal deicing, and photothermal sterilization, etc. are systematically summarized. Also, the challenges as well as future opportunities of SSAs are discussion. It is expected that this review will effectively complement the published comments on SSAs and provide more inspirations on sustainable applications of SSAs in the future.

“…[1][2][3] Solar energy, as an abundant and sustainable energy source, provides an alternative solution to fulfill expanding energy demand with limited impact on the environment. [4][5][6][7][8] Photothermal (PT) and photovoltaic (PV) are two primary technologies for harvesting sunlight and converting it into useable energy. [9][10][11][12][13][14][15] As shown in Figure 1a, PT and PV have different spectral efficiencies.…”

Section: Introductionmentioning

confidence: 99%

Boosting Total Conversion Efficiency of Hybrid Photovoltaic–Thermal via a Spectral Splitter/Absorber Based on Lossy Periodic Structured Media

Yin

et al. 2022

Solar RRL

Self Cite

A spectral splitter plays a crucial role in the hybrid photovoltaic (PV)–thermal design for efficient solar energy harvesting. Herein, the lossy medium periodic structure of ITO/Si is utilized to construct a novel spectral splitter/absorber that selectively reflects the solar energy in PV band while absorbing the rest of solar energy. The as‐prepared spectral splitter/absorber demonstrates a weighted reflectance of 75.6% in the PV band, an absorptance of 83.1% in the photothermal (PT) band, as well as superior angular performance across a broad incident range of 0°–60°. The proposed hybrid photovoltaic–thermal (PVT) system assembled with the spectral splitter/absorber with 1100 nm long edge of the PV band enhances the total electrical efficiency to 26.5%, higher than that of the individual Si PV cell (19.1%), resulting from the precise modulation of solar spectrum via the splitter/absorber to realize efficient utilization of solar energy in different bands. The temperature of PV cells in a hybrid PVT system also declines by ≈25 °C compared with the single‐Si PV cell. The PV band can be easily shifted to match other narrow‐bandgap PV cells due to intrinsic properties of near‐zero k of both ITO and Si at near‐infrared wavelength range and the large difference in n between them.