Tea stain-inspired solar energy harvesting polyphenolic nanocoatings with tunable absorption spectra
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Tea stain-inspired solar energy harvesting polyphenolic nanocoatings with tunable absorption spectra Lu Yang1,§, Yuan Zou1,§, Wei Xia1, Haotian Li1, Xinyu He1, Yi Zhou1, Xianhu Liu2, Chaoqun Zhang3,4, and Yiwen Li1 () 1
College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China 2 National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China 3 Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, 483 Wushan Road, Guangzhou 510642, China 4 Guangdong Laboratory for Lingnan Modern Agricultural Science and Technology, 483 Wushan Road, Guangzhou 510642, China § Lu Yang and Yuan Zou contribute equally to this work. © Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 18 August 2020 / Revised: 13 September 2020 / Accepted: 21 September 2020
ABSTRACT Discovery and development of new sustainable photothermal materials with tunable light absorption spectra play a key role in solar energy harvesting and conversion. One possible solution to this quest is to check nature as a source of matters or inspiration. Inspired by the formation of tea stains, a unique class of dark stain materials generated by the interfacial reaction between tea polyphenols and metal substance, we reported the facile preparation and screening of a series of photothermal nanocoating layers via the metal ion (i.e. Cu(II),Fe(III), Ni(II), Zn(II)) promoted in situ polymerization of typical phenolic moieties of tea polyphenols (i.e., catechol and pyrogallol). It was found that those resulting metal-polyphenolic nanocoatings showed various promising features, such as high blackness and strong adhesion, excellent and tunable light absorption properties, good hydrophilicity and long-term stability. We further fabricated the photothermal composite devices by in situ formation of metal-polyphenolic nanocoatings on pristine silks for solar desalination, which demonstrated promising durable evaporation behaviors with excellent evaporation rates and steam generation efficiencies. We believe that this work could provide more opportunities towards new types of bio-inspired and sustainable photothermal nanomaterials for solar energy harvesting applications such as water desalination.
KEYWORDS metal-polyphenolic nanocoating, polymerization, light absorption, photothermal, solar desalination
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Introduction
Nowadays, solar energy harvesting technology attracts many attentions to address the green and renewable energy issues [1–3]. In order to achieve highly efficient solar-to-heat conversion, photothermal materials are the key factors for absorbing and converting sunlight into thermal energy. So far, many kinds of photothermal materials have been well documented for solar desalination applications, including carbon-based materials [4–6], metallic nanoparticles [7–9] and organic polymer
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