期刊
ADVANCED MATERIALS
卷 32, 期 17, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201907975
关键词
broadband absorbers; hybrid metamaterials; nanoconfinement synthesis; solar energy; water treatment
类别
资金
- National Natural Science Foundation of China [51971133, 51672175, 51772187, 51572169]
- Shanghai Science and Technology Committee [18JC1410500, 16520710900, 17ZR1441400, 17520710600]
- Key Program for International S&T Cooperation Program of China [2017YFE0113000]
Sophisticated metastructures are usually required to broaden the inherently narrowband plasmonic absorption of light for applications such as solar desalination, photodetection, and thermoelectrics. Here, nonresonant nickel nanoparticles (diameters < 20 nm) are embedded into cellulose microfibers via a nanoconfinement effect, producing an intrinsically broadband metamaterial with 97.1% solar-weighted absorption. Interband transitions rather than plasmonic resonance dominate the optical absorption throughout the solar spectrum due to a high density of electronic states near the Fermi level of nickel. Field solar purification of sewage and seawater based on the metamaterial demonstrates high solar-to-water efficiencies of 47.9-65.8%. More importantly, the solution-processed metamaterial is mass-producible (1.8 x 0.3 m(2)), low-cost, flexible, and durable (even effective after 7 h boiling in water), which are critical to the commercialization of portable solar-desalination and domestic-water-purification devices. This work also broadens material choices beyond plasmonic metals for the light absorption in photothermal and photocatalytic applications.
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