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Enhancement of solar vapor generation by a 3D hierarchical heat trapping structure

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Abstract

Solar vapor generation is an efficient way to use solar energy for seawater desalination and sewage purification. The efficient utilization of solar-generated heat is a critical and hot topic for developing one-sun driven highly efficient solar vapor generation devices. Here, we reported a three-dimensional graphene-based hive (GBH) solar evaporator that can ensure efficient heat utilization by hierarchical heat trapping and efficient heat localization and reflux as well as long-term heat storage. As a result, a significant efficiency improvement (∼9%) was demonstrated in the 3D GBH evaporator from the initial 1.95 kg m−2 h−1 (corresponding to an energy efficiency of ∼85%) to the subsequent 2.13 kg m−2 h−1. In addition, the GBH evaporator exhibited an excellent water evaporation performance under discontinuous irradiation that is 81% of that achieved by continuous solar irradiation for one hour at 1 kW m−2. The promising 3D hierarchical design offers efficient heat trapping, localization, and reflux as well as long-term heat storage which make it easy to develop highly efficient solar vapor generation devices for sunny and cloudy days.

Graphical abstract: Enhancement of solar vapor generation by a 3D hierarchical heat trapping structure

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Publication details

The article was received on 30 Aug 2019, accepted on 01 Nov 2019 and first published on 01 Nov 2019


Article type: Paper
DOI: 10.1039/C9TA09554C
J. Mater. Chem. A, 2019, Advance Article

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    Enhancement of solar vapor generation by a 3D hierarchical heat trapping structure

    X. Song, H. Song, S. Wang, J. Liu, L. Zhou, J. Xu and K. Chen, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA09554C

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