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Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances

1
Guangdong Provincial Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen 518060, China
2
School of Architecture and Built Environment, The University of Newcastle, Callaghan, NSW 2308, Australia
3
Baoye Group Company Limited, Shanghai 312030, China
4
Institute of Applied Physics and Materials Engineering, University of Macau, Macau 999078, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(9), 1507; https://doi.org/10.3390/ma11091507
Received: 27 July 2018 / Revised: 13 August 2018 / Accepted: 15 August 2018 / Published: 22 August 2018
Although the inorganic salt hydrate phase change materials (PCMs) such as CaCl2·6H2O have promising potential for thermal energy storage in building application, the issue of supercooling has restricted their practical application. In this study, graphene oxide (GO) and SrCl2·6H2O as binary nucleation agents were used to modify CaCl2·6H2O and reduce its supercooling degree. Compared with pure CaCl2·6H2O, the incorporation of graphene oxide (GO)/SrCl2·6H2O reduced the supercooling degree to 0.3 °C significantly. In addition, the supercooling degree of modified CaCl2·6H2O after 200 thermal cycles was still much lower than that of non-modified CaCl2·6H2O. From the results of differential scanning calorimetry (DSC), the latent heat value and phase change temperature of the modified CaCl2·6H2O were 207.88 J/g and 27.6 °C, respectively. Aluminum capsules were used to encapsulate the modified PCM and placed inside the composite wallboard. The thermal performances of the composite wallboard with modified PCM were investigated using infrared thermography. Experimental results showed that the average temperature difference between the top and bottom surfaces of modified CaCl2·6H2O/wallboard composite after 1 h heating was kept around 15.8 °C, while it was 4.9 °C for the control wallboard. The above test results proved that the modified CaCl2·6H2O demonstrated good thermal performance and can be used in buildings to maintain thermal comfort. View Full-Text
Keywords: phase change material; supercooling; graphene oxide; SrCl2·6H2O; CaCl2·6H2O; thermal performance phase change material; supercooling; graphene oxide; SrCl2·6H2O; CaCl2·6H2O; thermal performance
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Jin, Z.; Tian, Y.; Xu, X.; Cui, H.; Tang, W.; Yun, Y.; Sun, G. Experimental Investigation on Graphene Oxide/SrCl2·6H2O Modified CaCl2·6H2O and the Resulting Thermal Performances. Materials 2018, 11, 1507.

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