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An Efficient Photothermal Conversion Material Based on D-A Type Luminophore for Solar-driven Desalination
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  • Jun-Cheng Yang,
  • Lin Wu,
  • Le Wang,
  • Runhua Ren,
  • Pu Chen,
  • Chuanxuan Qi,
  • Hai-Tao Feng,
  • Ben Tang
Jun-Cheng Yang
Baoji University of Arts and Sciences
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Lin Wu
Baoji University of Arts and Sciences
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Le Wang
Baoji University of Arts and Sciences
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Runhua Ren
Baoji University of Arts and Sciences
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Pu Chen
Baoji University of Arts and Sciences
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Chuanxuan Qi
Baoji University of Arts and Sciences
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Hai-Tao Feng
Baoji University of Arts and Sciences

Corresponding Author:haitaofeng907@163.com

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Ben Tang
The Chinese University of Hong Kong - Shenzhen
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Abstract

Solar-driven interfacial evaporation is a promising technology for desalination. The photothermal conversion materials are at the core and play a key role in this field. Design of photothermal conversion materials based on organic dyes for desalination is still a challenge due to lack of efficient guiding strategy. Herein, a new D (donor)-A (acceptor) type conjugated tetraphenylpyrazine (TPP) luminophore (namely TPP-2IND) was prepared as a photothermal conversion molecule. It exhibited a broad absorption spectrum and strong ππ stacking in the solid state, resulting in efficient sunlight harvesting and boosting nonradiative decay. TPP-2IND powder exhibited high photothermal efficiency upon 660 nm laser irradiation (0.9 Wcm -2), and the surface temperature can reach to 200 oC. Then, an interfacial heating system based on TPP-2IND is established successfully. The water evaporation rate and the solar-driven water evaporation efficiency were evaluated up to 1.04 kgm -2h -1 and 65.8% under 1 sunlight, respectively. Thus, this novel solar-driven heating system shows high potential for desalination and stimulates the development of advanced photothermal conversion materials.