Solar steam generation on scalable ultrathin thermoplasmonic TiN nanocavity arrays
Solar steam generation on scalable ultrathin thermoplasmonic TiN nanocavity arrays
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DOI：
10.1016/j.nanoen.2021.105828
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发表时间：
2021-02-02
期刊：
影响因子：
17.6
通讯作者：
Naldoni, Alberto
中科院分区：
文献类型：
--
作者：
Mascaretti, Luca;Schirato, Andrea;Naldoni, Alberto
基于等离子体的太阳能吸收器在亚微米厚度下表现出完全的光吸收，代表了最常用于太阳能驱动蒸汽发电的毫米厚碳基材料的替代品。在这项工作中，我们提出了超薄等离子体氮化钛 (TiN) 纳米腔阵列的可扩展制造，该阵列在距照明表面 250 nm 范围内表现出 90% 的宽带太阳光吸收，并显示出性能随光强度的快速非线性增长。在 14 Suns 时，TiN 纳米腔达到 - 15 kg h?1 m?2 蒸发率和 - 76% 热效率，从 - 0.4 kg h-1 m?2 急剧增加。 2 和 - 1.4 个太阳以下 20%。我们系统的电磁、热和扩散建模揭示了每种材料和反应堆组件对散热的贡献，并表明准二维散热机制显着加速了水蒸发。我们的超薄等离子体吸收器方法可以提高蒸发/海水淡化设备的性能，并有望实现更广泛的相分离过程。
Plasmonic-based solar absorbers exhibit complete light absorption in a sub-?m thickness, representing an alternative to mm-thick carbon-based materials most typically employed for solar-driven steam generation. In this work, we present the scalable fabrication of ultrathin plasmonic titanium nitride (TiN) nanocavity arrays that exhibit 90% broadband solar light absorption within - 250 nm from the illuminated surface and show a fast non-linear increase of performance with light intensity. At 14 Suns TiN nanocavities reach - 15 kg h?1 m?2 evaporation rate and - 76% thermal efficiency, a steep increase from - 0.4 kg h-1 m? 2 and - 20% under 1.4 Suns. Electromagnetic, thermal and diffusion modeling of our system reveals the contribution of each material and reactor component to heat dissipation and shows that a quasi-two-dimensional heat dissipation regime significantly accelerates water evaporation. Our approach to ultrathin plasmonic absorbers can boost the performance of devices for evaporation/desalination and holds promise for a broader range of phase separation processes.