Hierarchically Structured Black Gold Film with Ultrahigh Porosity for Solar Steam Generation
© 2022 Wiley-VCH GmbH.
| Publié dans: | Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 21 vom: 15. Mai, Seite e2200108 |
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| Auteur principal: | |
| Autres auteurs: | , , , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2022
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| Accès à la collection: | Advanced materials (Deerfield Beach, Fla.) |
| Sujets: | Journal Article dealloying nanoporous gold plasmonic metals seawater desalination solar steam generation |
| Résumé: | © 2022 Wiley-VCH GmbH. Plasmonic metals demonstrate significant potential for solar steam generation (SSG) because of their localized surface plasmon resonance effect. However, the inherently narrow absorption spectra of plasmonic metals significantly limit their applications. The fabrication of nanostructures is essential to achieve broadband solar absorption for high-efficiency vapor generation. Herein, a self-supporting black gold (Au) film with an ultrahigh porosity and a hierarchically porous structure is fabricated by formulating an extremely dilute Cu99 Au1 precursor and controlling the dealloying process. In situ and ex situ characterizations reveal the dealloying mechanism of Cu99 Au1 in a 1 m HNO3 solution as that involving the phase transformation of Cu(Au) → Au(Cu) → Au, giant volume shrinkage (≈87%), structural evolution/coarsening of ligaments, and development of ultrahigh porosity (86.2%). The multiscale structure, consisting of ultrafine nanoporous nanowires, aligned nanogaps, and various microgaps, provide efficient broadband absorption over 300-2500 nm, excellent hydrophilicity, and continuous water transport. In particular, the nanoporous black Au film shows high SSG performance with an evaporation rate of 1.51 kg m-2 h-1 and a photothermal conversion efficiency of 94.5% under a light intensity of 1 kW m-2 . These findings demonstrate that the nanoporous Au film has great potential for clean water production and seawater desalination |
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| Description: | Date Revised 26.05.2022 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 1521-4095 |
| DOI: | 10.1002/adma.202200108 |