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Author:

Guo, Youhong (Guo, Youhong.) | Zhao, Xiao (Zhao, Xiao.) | Zhao, Fei (Zhao, Fei.) | Jiao, Zihao (Jiao, Zihao.) | Zhou, Xingyi (Zhou, Xingyi.) | Yu, Guihua (Yu, Guihua.)

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SCIE EI Scopus Web of Science

Abstract:

Solar-driven interfacial evaporation has significant potential to improve the energy utilization efficiency and provides a means for sustainable seawater desalination and water purification technologies. Although rational design of evaporative materials and surfaces is essential to the interfacial solar water vaporization process, tailoring the surface wettability states of solar evaporators to accelerate the vapor generation rate remains unexplored. Here we demonstrate hydrophilic hydrogel evaporators with hydrophobic island-shaped patches, capable of achieving a record evaporation rate of similar to 4.0 kg m(-2) h(-1) with 93% efficiency under 1 sun irradiation (1 kW m(-2)). This exceptional high rate results from both wetting regions, which function synergistically. The increased thickness of the water layer in the hydrophilic region leads to the rapid escape of water molecules, while relatively long contact lines promise considerable water evaporation from the hydrophobic region, further contributing to this process. Molecular dynamics simulations provide a consistent outcome on a molecular basis, in which an inhomogeneous surface wetting property could modulate the escape behavior of water molecules to speed the evaporation. Under natural sunlight, a 3D printed portable solar water purification jug using this hydrogel evaporator delivers purified water far above the EPA drinking water standards, highlighting its potential for water purification.

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Author Community:

  • [ 1 ] [Guo, Youhong]Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA
  • [ 2 ] [Zhao, Fei]Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA
  • [ 3 ] [Zhou, Xingyi]Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA
  • [ 4 ] [Yu, Guihua]Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA
  • [ 5 ] [Guo, Youhong]Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA
  • [ 6 ] [Zhao, Fei]Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA
  • [ 7 ] [Zhou, Xingyi]Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA
  • [ 8 ] [Yu, Guihua]Univ Texas Austin, Dept Mech Engn, Austin, TX 78712 USA
  • [ 9 ] [Zhao, Xiao]Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China
  • [ 10 ] [Jiao, Zihao]Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China

Reprint Author's Address:

  • [Yu, Guihua]Materials Science and Engineering Program, Department of Mechanical Engineering, University of Texas at Austin, TX; 78712, United States;;

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Source :

ENERGY & ENVIRONMENTAL SCIENCE

ISSN: 1754-5692

Year: 2020

Issue: 7

Volume: 13

Page: 2087-2095

3 8 . 5 3 2

JCR@2020

3 8 . 5 3 2

JCR@2020

ESI Discipline: CHEMISTRY;

ESI HC Threshold:70

CAS Journal Grade:1

Cited Count:

WoS CC Cited Count: 109

SCOPUS Cited Count: 294

ESI Highly Cited Papers on the List: 9 Unfold All

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WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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