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Enhanced Photothermal Steam Generation and Gold Using the Efficiency of Ultralight Gold Foam with Hierarchical Porosity.
- Source :
-
Langmuir : the ACS journal of surfaces and colloids [Langmuir] 2023 Mar 21; Vol. 39 (11), pp. 4190-4197. Date of Electronic Publication: 2023 Mar 07. - Publication Year :
- 2023
-
Abstract
- Controlling the optical properties of metal plasma nanomaterials through structure manipulation has attracted great attention for solar steam generation. However, realizing broadband solar absorption for high-efficiency vapor generation is still challenging. In this work, a free-standing ultralight gold film/foam with a hierarchical porous microstructure and high porosity is obtained through controllably etching a designed cold-rolled (NiCoFeCr) <subscript>99</subscript> Au <subscript>1</subscript> high-entropy precursor alloy with a unique grain texture. During chemical dealloying, the high-entropy precursor went through anisotropic contraction, resulting in a larger surface area compared with that from the Cu <subscript>99</subscript> Au <subscript>1</subscript> precursor although the volume shrinkage is similar (over 85%), which is beneficial for the photothermal conversion. The low Au content also results in a special hierarchical lamellar microstructure with both micropores and nanopores within each lamella, which significantly broadens the optical absorption range and makes the optical absorption of the porous film reach 71.1-94.6% between 250 and 2500 nm. In addition, the free-standing nanoporous gold film has excellent hydrophilicity, with the contact angle reaching zero within 2.2 s. Thus, the 28 h dealloyed nanoporous gold film (NPG-28) exhibits a rapid evaporation rate of seawater under 1 kW m <superscript>-2</superscript> light intensity, reaching 1.53 kg m <superscript>-2</superscript> h <superscript>-1</superscript> , and the photothermal conversion efficiency reaches 96.28%. This work demonstrates the enhanced noble metal gold using efficiency and solar thermal conversion efficiency by controlled anisotropic shrinkage and forming a hierarchical porous foam.
Details
- Language :
- English
- ISSN :
- 1520-5827
- Volume :
- 39
- Issue :
- 11
- Database :
- MEDLINE
- Journal :
- Langmuir : the ACS journal of surfaces and colloids
- Publication Type :
- Academic Journal
- Accession number :
- 36880648
- Full Text :
- https://doi.org/10.1021/acs.langmuir.3c00254