A new selective solar absorber stable in air based on a novel multilayer configuration is designed for CSP applications with operating temperatures up to 550 °C. This configuration satisfies the higher operating temperature requirements of next-generation CSPs and prevents the current high-temperature failures due to oxidation. This material is made of six layers (SiO/PtAlO/Pt/PtAlO/CuCoMnO/SiO), deposited on stainless steel and quartz by the cost-effective dip-coating methodology. A solar absorptance of 0.957 and a thermal emittance of 0.10 at 500 °C are achieved for the optimised material prepared on stainless steel 316L. The work presents the optimisation and characterisation of the solar absorber developed in stainless steel and its durability study with respect to thermal and constant condensation conditions on both stainless steel and quartz substrates. XRD analysis indicates the high crystallinity of each constituting layer except SiO (amorphous) and the depth profile by XPS confirms the sequence of the six layers that comprise the absorber. The multilayer stack shows outstanding thermal stability withstanding perfectly 3072 h at 500 °C in an open air atmosphere (PC < 0.01), independently of the substrate. The resistance to condensation test is directly dependent on the substrate. The designed CuCoMnO–based selective absorber confirms its ability to be used in solar thermal systems. The material presented can be used in parabolic trough receivers with the advantage of maintaining its performance in case of vacuum loss. Moreover, its stability under condensation conditions directs a future line of research aimed at its application in solar tower receivers (Inconnel/AISI 347).

中文翻译：

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高性能选择性太阳能吸收器，在空气中稳定，适用于高温应用

一种基于新颖多层结构的新型选择性太阳能吸收器在空气中稳定，专为工作温度高达 550 °C 的 CSP 应用而设计。这种配置满足了下一代CSP更高的工作温度要求，并防止了目前由于氧化而导致的高温故障。该材料由六层 (SiO/PtAl2O/Pt/PtAl2O/CuCoMnO/SiO) 制成，通过经济有效的浸涂方法沉积在不锈钢和石英上。在不锈钢 316L 上制备的优化材料在 500 °C 下的太阳吸收率为 0.957，热发射率为 0.10。这项工作介绍了不锈钢太阳能吸收器的优化和表征，及其在不锈钢和石英基板上的热和恒定冷凝条件下的耐久性研究。 XRD 分析表明，除 SiO（无定形）外，每个构成层都具有高结晶度，XPS 的深度剖面证实了构成吸收体的六层的顺序。该多层堆叠表现出出色的热稳定性，无论基材如何，都能在 500 °C 的露天环境中完美承受 3072 小时 (PC < 0.01)。抗冷凝测试直接取决于基材。设计的 CuCoMnO 基选择性吸收器证实了其在太阳能热系统中使用的能力。该材料可用于抛物线槽接收器，其优点是在真空损失的情况下仍能保持其性能。此外，其在冷凝条件下的稳定性指导了未来的研究方向，旨在将其应用于太阳能塔式接收器（Inconnel/AISI 347）。