A multilayer solar absorber coating based on NbMoTaW refractory high entropy alloy: optical properties, thermal stability, and failure mechanism

Yu, Dongmei; He, Cunxiao; Qiu, Xiao‐Yang; Zhao, Shuxi; Guo, Huixia; Liu, G.; Gao, Xiang‐Hu

doi:10.1016/j.mtener.2021.100789

Cited by 7 publications

(2 citation statements)

References 45 publications

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“…In another study, Yu et al utilized an ellipsometer to ascertain the n and k values of NbMoTaWN HE nitride films across wavelengths of 300-2100 nm. [141] Harnessing these optical constants, the reflectance spectra of a NbMoTaWNbased triple-layer spectrally selective absorber were optimized via optical software. This achieved a high solar absorptance of 93.6% and a reduced IR emittance of 12.6%.…”

Section: He Material-based Spectrally Selective Absorbersmentioning

confidence: 99%

High‐Entropy Photothermal Materials

He,

Li,

Zhou

et al. 2024

Advanced Materials

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High‐entropy (HE) materials, celebrated for their extraordinary chemical and physical properties, have garnered increasing attention for their broad applications across diverse disciplines. The expansive compositional range of these materials allows for nuanced tuning of their properties and innovative structural designs. Recent advances have been centered on their versatile photothermal conversion capabilities, effective across the full solar spectrum (300‐2500 nm). The HE effect, coupled with hysteresis diffusion, imparts these materials with desirable thermal and chemical stability. These attributes position HE materials as a revolutionary alternative to traditional photothermal materials, signifying a transformative shift in photothermal technology. This review delivers a comprehensive summary of the current state of knowledge regarding HE photothermal materials, emphasizing the intricate relationship between their compositions, structures, light‐absorbing mechanisms, and optical properties. Furthermore, the review outlines the notable advances in HE photothermal materials, emphasizing their contributions to areas such as solar water evaporation, personal thermal management, solar thermoelectric generation, catalysis, and biomedical applications. The review culminates in presenting a roadmap that outlines prospective directions for future research in this burgeoning field, and also outlines fruitful ways to develop advanced HE photothermal materials and to expand their promising applications.This article is protected by copyright. All rights reserved

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Section: He Material-based Spectrally Selective Absorbersmentioning

confidence: 99%

High‐Entropy Photothermal Materials

He,

Li,

Zhou

et al. 2024

Advanced Materials

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“…[9][10][11] Up to date, the optical properties of HEAs are demonstrated for the solar energy harvest in a large bandwidth of the solar spectra. [11][12][13][14] In these systems, the optical absorption ability was only performed with the wide sunlight with a relatively low intensity. Thus far, the development of applications in nonlinear optics with HEAs is still of great challenge.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Interband Transition in FeCoNiAlTi High‐Entropy Alloy for Ultrafast Nonlinear Optical Applications

Liu,

Li,

et al. 2023

Advanced Optical Materials

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High‐entropy alloys (HEAs) possess superior mechanical, thermal, and electronic properties, which attract great interest in the fields of photothermal, electrocatalysis, and magnetic applications. Herein, the nonlinear optical properties of FeCoNiAlTi HEA with a large specific surface area for the first time is investigated. Owing to the strong d–d interaction, the interband transition near the Fermi level could be enhanced in HEAs, leading to broadband optical absorption. Excitation with the picosecond laser source, the FeCoNiAlTi HEA possesses saturable absorption with a large modulation depth of 7.61% and 30.47% at 1 and 1.5 µm, respectively. Furthermore, at the higher excitation level at 1.5 µm, the saturable absorber exhibits a typical reverse saturable absorption property. Subsequently, the FeCoNiAlTi HEA on the tapered fiber first serves as the saturable absorber in the Yb‐doped fiber laser and the Er‐doped fiber laser, leading to the noise‐like pulses at 1 µm, and the stable Q‐switching, conventional soliton, and dissipative soliton resonance mode‐locking operations at 1.5 µm. This work confirms that the enhanced saturable absorption in HEAs can endow the high‐performance ultrashort pulse generation.

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