Integrated photothermal aerogels with ultrahigh-performance solar steam generation

Yufei Gu, Xiaojiang Mu, Pengfei Wang, Xiaoyang Wang, Jing Liu, Jiaqi Shi, Anyun Wei, Yongzhi Tian, Guisheng Zhu, Huarui Xu, Jianhua Zhou, Lei Miao

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Highly efficient solar steam generation (SSG) relies on excellent light absorption, adequate water transportation, a large evaporation area, and high thermal management capability in coherent photothermal materials. However, there is not yet a general means of integrating these functions on a monolith with design flexibility in chemical compositions and pore structure. Here, we design and demonstrate a versatile chitosan (CS) aerogel that is easily compatible with other photothermal materials for high-efficiency SSG. The CS aerogel was synthesized through liquid-phase one-pot freeze drying without any cross-linkers. CS composite aerogels not only preserved the initial characteristics of the CS aerogel but also integrated biocompatible, hydrophilic and high thermal insulation properties, as well as enhanced light absorption ability based on the designed porous structure through the effects of light trapping and multiple scattering. Carbonized pomelo peel particles composited with the CS aerogel and freeze dried by lyophilizer (PP0.1CS1.5-L) exhibited excellent SSG performance with an evaporation rate of up to 1.78 kg m−2 h−1, which is far beyond that attainable by two-dimensional SSG systems under normal solar irradiation of 1 kW m−2. This research opens up a new avenue for the facile fabrication of reusable, low-cost, nontoxic, and high-performance functional aerogels.

Original languageEnglish
Article number104857
JournalNano Energy
Volume74
DOIs
Publication statusPublished - 2020 Aug
Externally publishedYes

Keywords

  • Evaporation rate
  • Freeze drying
  • Light absorption
  • Photothermal conversion
  • Solar steam generation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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  • Cite this

    Gu, Y., Mu, X., Wang, P., Wang, X., Liu, J., Shi, J., Wei, A., Tian, Y., Zhu, G., Xu, H., Zhou, J., & Miao, L. (2020). Integrated photothermal aerogels with ultrahigh-performance solar steam generation. Nano Energy, 74, [104857]. https://doi.org/10.1016/j.nanoen.2020.104857