Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 21, Pages 17682-17690Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b03853
Keywords
Solar-thermal conversion; Phase change materials; Single-walled carbon nanotubes; Poly(ethylene glycol); Thermal energy storage
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Funding
- National Natural Science Foundation of China [51773129, 51903167]
- Sichuan Science and Technology Program [2019YFG0257]
- Postdoctoral research foundation of Sichuan University [2018SCU12049]
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The development of organic phase change materials (PCMs) with good shape stability, superior photothermal conversion efficiency, and high thermal conductivity is critical for practical photothermal utilizations. Herein, novel form-stable solar-thermal conversion and storage materials (SPCMs) with superior photothermal conversion efficiency and thermal conductivity were successfully synthesized by introducing amino-functionalized single walled carbon nanotubes (SWNTs-NH2) into poly(ethylene glycol)-based polyurethane PCM. Differential scanning calorimetry (DSC) and thermal conductivity test results showed the SPCMs possessed relatively high phase change enthalpies in the range of 124.0-126.1 J/g and that the introduction of SWNTs-NH2 effectively enhanced the thermal conductivities of SPCMs. Sunlight irradiation experiments showed that the introduction of SWNTs-NH2 into PEG-based polyurethane PCM significantly improved the solar-thermal conversion and storage efficiency of SPCMs from 44.8% to 89.3%. The light irradiation cycling tests and thermogravimetric (TG) analyses indicated that the SPCMs exhibit satisfactory reversible stability and thermal stability. Moreover, SPCMs with SWNTs-NH2 added exhibited much higher solar-thermal conversion and storage efficiency and better reversible stability than SPCM with SWNTs added. In conclusion, the synthesized SPCMs show considerable potential for solar-thermal conversion and storage applications.
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