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Preparation and thermal characterization of sodium acetate trihydrate/expanded graphite composite phase change material

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Abstract

The sodium acetate trihydrate (SAT)/expanded graphite (EG) composite phase change material (PCM) was firstly prepared by absorbing liquid SAT into a porous network of EG, in which SAT acted as the PCM. EG prepared at microwave irradiation power of 800 W for 30 s with maximum volumes has the largest sorption capacity for SAT. At the mass fraction of SAT <95 %, SAT uniformly disperse in the pores of EG without liquid leakage evidenced from scanning electron microscopy characterization. X-ray diffraction results further show that PCM is just a combination between SAT and EG without any chemical reaction. Differential scanning calorimeter measurements indicate that the melting temperature and latent heat of the composite PCM are 59.5 °C and 202 J g−1, respectively, close to those of pure SAT. The thermal conductivity of the composite PCM can be as high as 1.589 W m−1 K−1.The form-stable SAT/EG composite with SAT mass fraction of 95 % has great potential in thermal energy storage due to its moderate melting point, significant latent heat storage capacity, form-stable property, direct usability without need for an extra storage container, and high thermal conductivity.

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Acknowledgements

This study is financially supported by Bei**g Natural Science Foundation (Grant No. 2132024).

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Authors and Affiliations

  1. Key Laboratory of Orogenic Belts and Crustal Evolution, MOE, School of Earth and Space Sciences, Peking University, Bei**g, 100871, People’s Republic of China

    **aobin Gu, Shan Qin & **ang Wu

  2. School of Civil and Environmental Engineering, University of Science & Technology Bei**g, Be**g, 100083, People’s Republic of China

    Yuan Li

  3. China University of Geosciences, Bei**g, 100083, People’s Republic of China

    Yingxin Liu

Authors
  1. **aobin Gu
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  2. Shan Qin
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  3. **ang Wu
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  4. Yuan Li
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Correspondence to Shan Qin.

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Gu, X., Qin, S., Wu, X. et al. Preparation and thermal characterization of sodium acetate trihydrate/expanded graphite composite phase change material. J Therm Anal Calorim 125, 831–838 (2016). https://doi.org/10.1007/s10973-016-5444-4

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  • DOI: https://doi.org/10.1007/s10973-016-5444-4

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