期刊
ENERGY CONVERSION AND MANAGEMENT
卷 252, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2021.115070
关键词
MoS2 nanosheet; S vacancy; Photothermal photocatalysis; Solar-driven interfacial water evaporation; Thermoelectric generation
资金
- Natural Science Foundation of Shandong Province [ZR2019MEM042]
- Project of Shandong Province Higher Educational Science [2019KJA011]
- Yantai Science and Technology Development Program [2020XDRH107]
By using MoS2-x nanosheet arrays with S vacancies grown on Mo meshes as solar absorbers, a high solar energy utilization system was achieved. This system used interfacial heat to drive water evaporation and photothermal-enhanced photodegradation, converting waste heat to electricity simultaneously, thus enhancing the evaporation performance.
Integrating new functionalities into solar-driven interfacial evaporation systems has received considerable attention. Herein, a high solar energy utilization system was accomplished by using vertically aligned MoS2-x nanosheet arrays with S vacancies (MoS2-x NSAs) in situ grown on Mo meshes as solar absorbers. In this system, interfacial heat was used to drive water evaporation and photothermal-enhanced photodegradation, and the produced waste low-grade heat was converted to electricity simultaneously. The MoS2-x NSAs possessed a solar absorptance of 94.2%, favorable photothermal conversion, and heat localization properties. The localized heat and S vacancies collaboratively improved the photodegradation performance by boosting the separation of photogenerated carriers, which avoided dye accumulation on the surface of the MoS2-x NSAs during a long-term operation. Furthermore, the solar absorber with flexible and shape adaptiveness was greatly feasible for enhancing solar evaporating performance or integrating different functionalities. Specifically, a 0.45 kg m(-2)h (1) increase in evaporation rate was achieved by the three-dimensional (3D) U-shaped MoS2-x NSAs in comparison with the two-dimensional (2D) counterpart. And the 3D U-shaped MoS2-x NSAs coupled with a thermoelectric module could uninterruptedly convert waste heat to electricity all day. This study successfully introduced photocatalysis and light-induced thermoelectricity into state-of-art solar-driven interfacial evaporation systems, which broadened this technology's application.
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