期刊
RENEWABLE ENERGY
卷 183, 期 -, 页码 820-829出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.11.054
关键词
Solar energy; Nanofluids; Broad-band absorption; Photothermal conversion; Solar evaporation
资金
- National Natural Science Foundation of China [51872151, 51741206]
- Natural Science Foundation of Shandong Province [ZR2017MEM004]
Volumetric solar evaporation has great potential in various applications such as clean water production, desalination, and wastewater treatment. However, the efficiency of current volumetric solar evaporation is still low, and there is a need to explore new strategies for improving it. In this study, ATO@C nanofluids were used to achieve a high evaporation efficiency of 88.6% by adjusting the mass fraction and reducing the thickness.
Volumetric solar steam generation has attracted substantial interest due to its low cost, minimum carbon footprint and wide application in many areas including clean water production, desalination, and wastewater treatment. However, the efficiency of volumetric solar evaporation is still low and there is an urgent need to investigate the fundamental of the limitation of low efficiency and find a new strategy to improve the solar evaporation efficiency. In the current work, antimony doped tin oxide@carbon (ATO@C) nanofluids were prepared by a hydrothermal approach. The ATO@C nanofluids exhibit broadband and high absorption in the solar spectrum due to the complementary effect of C (in visible region) and ATO (in the near infrared region). ATO@C nanofluids of 0.3 wt% could harvest 99.9% of the incident solar energy within 1 cm penetration distance. The photothermal conversion efficiency is 97.8%. The coupling relationship between the solar harvesting and the energy distribution was revealed. Increasing mass fraction and reducing thickness can localize the heat in the surface layer of nanofluids and thus minimize the energy consumption in heating water (internal energy) and therefore improve the solar evaporation efficiency. A high evaporation efficiency of 88.6% was achieved in this way. (c) 2021 Elsevier Ltd. All rights reserved.
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