Abstract Controlling solar spectra via the careful design could realize the optimized utilization of energy. Especially for spectrally selective solar absorbers, achieving the appropriate transition wavelength can boom conversion efficiency for a certain application under the consideration of cost. Here, we experimentally demonstrated a kind of WTa-SiO2 cermet based absorbers with transition wavelength of around 1500 nm, 2000 nm, and 2500 nm, which can meet the versatile applications under the conditions of different operating temperatures and different optical concentrations. All the absorbers possess a promising solar absorptance of above 95% and photothermal efficiency of above 91% at 82 °C with 1 sun, as well as the superior thermal stability at 600 °C due to the formation of tantalum oxide in WTa-SiO2 cermet in the annealing process.

中文翻译：

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通过调整基于 WTa-SiO2 的光谱选择性吸收剂的跃迁波长实现多功能应用

摘要 通过精心设计控制太阳光谱可以实现能量的优化利用。特别是对于光谱选择性太阳能吸收器，在考虑成本的情况下，实现适当的跃迁波长可以提高某些应用的转换效率。在这里，我们通过实验证明了一种基于 WTa-SiO2 金属陶瓷的吸收剂，其跃迁波长约为 1500 nm、2000 nm 和 2500 nm，可满足不同工作温度和不同光学浓度条件下的多种应用。所有吸收剂都具有超过 95% 的太阳能吸收率和超过 91% 的光热效率，在 82 °C 和 1 个太阳下，以及由于在 WTa-SiO2 金属陶瓷中形成氧化钽而在 600 °C 下具有优异的热稳定性在退火过程中。