Journal
NANO ENERGY
Volume 83, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2021.105828
Keywords
Ultrathin plasmonic TiN absorber; Solar steam generation; Nanocavity array; Multi-physics modeling; Quasi-two dimensional heat transfer
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Funding
- Ministry of Education, Youth and Sports of the Czech Republic (MEYS CR) through the project ERC CZ [LL1903]
- Operational Programme Research, Development and Education - European Regional Development Fund [CZ.02.1.01/0.0/0.0/15_003/0000416]
- National Science Foundation [IIP-1941227]
- MEYS CR [LM2018110]
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This study presents a scalable fabrication method for ultrathin plasmonic titanium nitride (TiN) nanocavity arrays, which exhibit 90% broadband solar light absorption within a sub-μm thickness. The TiN nanocavities show a fast non-linear increase in performance with increasing light intensity, reaching high evaporation rates and thermal efficiency under high solar irradiation conditions.
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.
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