新型的高透射合金的太阳能选择性吸收涂层

高渗透合金是合金材料世界中的新手，并且超过了五个以上的组成元素，并超过了传统的合金设计概念。由于其高配置熵，它们还具有简单的实心解决方案结构。

High-entropy alloys exhibit superior mechanical properties, have the ability to endure heat and are resistant to corrosion, wear and irradiation, thus having great potential for advancement in the renewable energy industry.

由Xianghu Gao副教授和Lanzhou化学物理研究所的Gang Gao教授领导的研究人员团队Chinese Academy of ScienceS（CAS）最近通过使用组件调制，构象熵优化和具有高透射氮化物的结构设计的方法，合成了一系列高渗透合金的高温太阳能选择性吸收涂层。

The team has engineered a color solar selective absorbing coating with an infrared reflective layer of high-entropy alloy nitride, aluminum, silicon dioxide and high-entropy alloy nitrogen oxide. This facilitates a thermal emittance of less than 10% and high solar absorption of 93.5%.

然后，他们确定了一层高渗透合金氮化物陶瓷也表现出最佳的内在吸收特性，因此，它们合成了具有简单结构的涂层。

High-entropy alloy nitride was used as the absorption layer and Si₃n₄或Sio₂was used as the antireflective layer. Thus, a coating with an absorption of 92.8% and emissivity of less than 7% was achieved, exhibiting ideal thermal stability in vacuum at 650 °C for 300 hours.

研究人员通过选择低氮含量高渗透合金膜作为主要吸收层，不锈钢作为底物，高氮含量高递送合金膜作为灭绝干扰层和Al AL₂o₃, SiO₂or Si₃n₄作为抗反射层。这导致结构逐渐将光学常数从底物降低到表面。

研究人员结合了光学仿真和磁控溅射技术来提高制备效率，从而导致96％的高太阳吸收和低的热发射低于10％。

然后，研究人员通过有限差分时间域模拟分析了光吸收机制。即使在600°C下在真空中退火后，高渗透合金基于氮化合物的吸收剂仍保留了最佳的光学特性，持续168小时，表示其出色的热稳定性。

The absorber’s photothermal conversion efficiency was estimated at various concentration ratios and operating temperatures, and the efficiency could reach 90.1% at an operating temperature of 550 °C and 100 suns.

When compared to the most advanced absorber reported recently, the high-entropy alloy-based absorber showed both superior photothermal conversion efficiency and thermal stability.

吸收剂沉积在各种底物材料上，维持优质的光学特性，并在铝箔上实现大规模制备。欧洲杯足球竞彩对各种入射角吸收光谱的研究表明，吸收涂层在入射光角0°-60°的范围内表现出良好的吸收。

When subjected to radiation from simulated sunlight, the coating surface temperature surpassed 100 ℃, showing that the material could be promising for the field of interfacial water evaporation.

作为本研究的一部分制备了具有优质光学特性和高温耐药性的高温太阳能选择性吸收涂层，并扩大了高渗透合金在新能源材料区域的功能应用。欧洲杯足球竞彩

This study was funded by the Youth Innovation Promotion Association of CAS, the Regional Key Projects of the Science and Technology Service Network Program of CAS, and the Major Science and Technology Projects of Gansu Province.

期刊参考：

Guo, H.-X.,等。（（2021) A novel multilayer high temperature colored solar absorber coating based on high-entropy alloy MoNbHfZrTi: Optimized preparation and chromaticity investigation.Solar Energy Materials and Solar Cells。doi.org/10.1016/j.solmat.2020.110444。

Source:https://english.cas.cn/