功能化碳纳米纤维增强芒硝基相变储能材料的热性能

doi:10.11896/cldb.21050177

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Abstract The low thermal conductivity is a hindrance to salt hydrate as it leads to slow rates of heat absorption and release, which limits the practical application of inorganic hydrate salts. In this work, a series of Na₂SO₄·10H₂O/PSA composite materials with different weight ratios were fabricated by using the Na₂SO₄·10H₂O as phase change materials and polyacrylic acid sodium as a supporting materials, and by adding carbon nanofibers to enhance thermal conductivity. Scanning electron microscopy micrographs revealed that composite PCMs have been successfully prepared, and Na₂SO₄·10H₂O and functionalized carbon nanofibers are embedded in 3D networks of PSA, the above three materials bonding together to form a smooth network structure. FTIR and Raman spectra results indicated that there were no chemical interactions between components in phase transition system. Differential scanning calorimetry suggested that phase transition behavior of the system was adjusted by the interaction between polyacrylic acid sodium and Na₂SO₄·10H₂O, as melting and crystallization enthalpy are 197.2 J/g and 137.0 J/g, respectively. Compared with Na₂SO₄·10H₂O/PSA, thermal conductivity of CNFs-Na₂SO₄·10H₂O/PSA significantly increased, of which thermal conductivity of solid state reached about 1.2 W/(m·K) and thermal conductivity of liquid state was about 1.0 W/(m·K). Moreover, after 300 thermal cycles, melting and crystallization enthalpy of composite phase change materials decreased by 23.3% and 28.8% respectively.

Key words： Na₂SO₄·10H₂O phase change materials carbon nanofibers functional phase transition behaviors thermal conductivity

Published: 25 March 2022 Online: 2022-03-21

CLC number:	TQ12
	TB34

Fund:Natural Science Foundation of Qinghai Province (2020-ZJ-909), and State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (Wuhan University of Technology) (2020-KF-1).

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	TIE Shengnian

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WEI Ning,TIE Shengnian. Functionalized Carbon Nanofibers Enhance the Thermal Properties of Glauber's Salt-based Phase Change Energy Storage Materials[J]. Materials Reports, 2022, 36(6): 21050177-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21050177 OR http://www.mater-rep.com/EN/Y2022/V36/I6/21050177

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