4.7 Article

Preparation and thermal properties of exfoliated graphite/erythritol/mannitol eutectic composite as form-stable phase change material for thermal energy storage

期刊

SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 178, 期 -, 页码 84-90

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2018.01.012

关键词

Form-stable phase change materials; Thermal energy storage; Eutectic mixture; Erythritol; Mannitol

资金

  1. National Natural Science Foundation of China [21003014, 21501015, 21275022]
  2. Natural Science Foundation of Hunan Province, China [2017JJ1026, 13JJ3068]
  3. Scientific Research Fund of Hunan Provincial Education Department [15B0002]
  4. Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation (Changsha University of Science Technology) [2014CL05]

向作者/读者索取更多资源

The m-Erythritol (erythritol, ME)/D-mannitol (mannitol, DM) binary system was investigated by differential scanning calorimetry (DSC), and the phase diagram was then obtained. It was found that the eutectic composition was at the mole fraction of erythritol x(ME) = 0.87. The latent heat of fusion (Delta H-m) of the eutectic mixture was 322.8 J/g with a peak melting temperature (T-p,T- m) of 114.4 degrees C. A cyclic DSC experiment revealed that the Delta H-m of the eutectic mixture slightly decreased, and the Tp, m remained stable over 50 DSC cycles. Exfoliated graphite (EG) was then applied to absorb the eutectic mixture to obtain the EG/eutectic composite form-stable phase change material (PCM) and enhance its thermal conductivity. Good form stability could be obtained when the loading of EG in the EG/eutectic composite reached 2.0 wt%. The thermal conductivity of the eutectic mixture was greatly enhanced by EG. When the loading of EG was 10.0 wt%, the thermal conductivity increased by 408% compared to that of the eutectic mixture. Additionally, severe supercooling of the eutectic mixture was also greatly alleviated by EG. The best result was obtained when 3.0 wt% EG was added, for which the degree of supercooling (AT) was 62.6 degrees C and the heat of crystallization (Delta H-cr) was 185.7 J/g. X-ray diffraction (XRD) experiments revealed that the eutectic mixture was simply a physical mixture of erythritol and mannitol. Thermal gravimetry (TG) investigations showed that the eutectic mixture and the EG/eutectic composite form stable PCM exhibited good thermal stability for its applications.

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