Journal
CHEMSUSCHEM
Volume 14, Issue 24, Pages 5434-5441Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202101532
Keywords
ionic liquids; photo-thermo-electric conversion; polyoxometalates; solar energy; thermogalvanic effect
Funding
- Hefei National Laboratory for Physical Sciences at the Microscale
- Hefei Science Center of Chinese Academy of Sciences
- National Synchrotron Radiation Laboratory
- Fujian Institute of Innovation of Chinese Academy of Sciences
- National Natural Science Foundation of China (NSFC) [21571167, 51502282, 22075266]
- Fundamental Research Funds for the Central Universities [WK2060190053, WK2060190100]
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The study successfully demonstrated the efficient utilization of low-grade thermal energy and solar energy using the polyoxovanadate-ionic liquid system, offering a new platform for electricity generation.
A large fraction of energy, including solar energy, is dissipated into ambient atmosphere as low-grade waste heat. Efficient utilization of such energy is critical to address the current energy crisis and global warming issue. Herein, the efficient near-IR (NIR)-photothermal, thermoelectric, and thus photo-thermo-electric conversion of polyoxovanadate compound {[Ni(1,10-phenanthroline)(3)][V14O34Cl]Cl, NiV14} in ionic liquid was achieved. The solution displayed a NIR-photothermal efficiency of 16.04 and 23.43 % at 808 and 1064 nm, respectively. Taking advantage of the synergetic thermodiffusive and thermogalvanic effects of various ion species in NiV14 solution, an open circuit voltage of approximately 0.45 V was obtained at Delta T=70 K generated by physical heating or NIR irradiation, indicating a large Seebeck coefficient of 6.38 mV K-1 and an optimized thermal power at 1.2 W m(-2). The polyoxovanadate-ionic liquid system offers a new platform for efficiently utilizing not only low-grade thermal energy but also solar energy for electricity generation.
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