High-Entropy Alloy Nitride AlMo0.5NbTa0.5TiZrNx-Based High-Temperature Solar Absorber Coating: Structure, Optical Properties, and Thermal Stability
High-Entropy Alloy Nitride AlMo0.5NbTa0.5TiZrNx-Based High-Temperature Solar Absorber Coating: Structure, Optical Properties, and Thermal Stability
复制标题
DOI：
10.1021/acsaem.2c02009
复制
发表时间：
2022-07
影响因子：
6.4
通讯作者：
Shuai-Sheng Zhao;Cheng-Yu He;Xiao-Li Qiu;Penghui Zhao;Baohua Liu;Gang Liu;Xiang-Hu Gao;Guangyan Tian
中科院分区：
文献类型：
--
作者：
Shuai-Sheng Zhao;Cheng-Yu He;Xiao-Li Qiu;Penghui Zhao;Baohua Liu;Gang Liu;Xiang-Hu Gao;Guangyan Tian
先进的太阳能热技术，包括太阳能集热器、太阳能热光伏系统和聚光太阳能发电系统，在很大程度上依赖于太阳能选择性吸收涂层（SSACs）进行光热转换。ssac的研究工作不仅关注其光学性质，还关注其在大温度范围内的高温应用。本文首先设计了一种基于almo0.5 nbta0.5 tizrnx高熵合金氮化陶瓷的SSAC，并通过磁控溅射方法在不锈钢（SS）衬底上制备了SSAC。多层almo0.5 nbta0.5 tizrnx基太阳能吸收膜具有良好的光学性能，高吸收率为0.932，低红外发射度为0.063。为了保证涂层的热稳定性，制备的涂层在不同温度下进行真空退火处理。有趣的是，光谱选择性在673 K下下降到0.798/0.067，而在973 K下上升到0.855/0.08，持续2小时。此外，采用时域有限差分（FDTD）计算来确定光吸收的演变对本征吸收的贡献。系统分析表明，电场的明显衰减是由双金属陶瓷层光学常数的变化引起的。
Advanced solar thermal technologies, including solar thermal collectors, solar thermophotovoltaic systems, and concentrated solar power systems, depend heavily on solar selective absorber coatings (SSACs) for photothermal conversion. Efforts for the research work of SSACs focus not only on optical properties but also on their high-temperature applications over a wide temperature range. Here, an SSAC based on an AlMo0.5NbTa0.5TiZrNxhigh-entropy alloy nitride ceramic is first designed and fabricated on a stainless steel (SS) substrate via the magnetron sputtering method. The multilayer AlMo0.5NbTa0.5TiZrNx-based solar absorber coatings show good optical properties with a high absorptance value of 0.932 and a low infrared emittance value of 0.063. For the thermal stability of this coating, the as-fabricated coatings are subjected to the annealing process in vacuum at different temperatures. It is interesting that the spectral selectivity deteriorates to 0.798/0.067 at 673 K for 2 h but increases to 0.855/0.08 at 973 K for 2 h. In addition, finite difference time domain (FDTD) calculations are employed to determine the evolution of the optical absorption contributing to intrinsic absorption. The obvious attenuation of the electric field was caused by the change in the optical constants of the bimetallic ceramic layer, as evidenced by systematic analysis.