Fabrication and characterization of novel meso-porous carbon/n-octadecane as form-stable phase change materials for enhancement of phase-change behavior

doi:10.1016/j.jmst.2018.11.001

Abstract

Abstract:

In this study, series of novel composite phase change materials (PCMs) were prepared through vacuum impregnation by using meso-porous carbon as a supporting matrix and n-octadcane as PCMs. The meso-porous carbon material was prepared through one-pot co-assembly method, using resorcinol and formaldehyde as carbon precursor, tetraethoxysilane as silica sources and triblock copolymer F127 as a template. And the phase behaviors of n-octadcane confined in the nano-porous structure of the meso-porous carbon were further investigated. Fourier transform-infrared spectroscopy spectra show that n-octadecane was effectively encapsulated in the porous structure of mesoporous carbon and the composite PCMs were successfully prepared. Differential scanning calorimetry results confirm that the composite PCMs possess a good phase change behavior, fast thermal-response rate and excellent thermal cycling stability. In addition, the composite PCMs possess expected heat storage and heat release properties. All these results demonstrate that the composite PCMs possess good comprehensive property so that they can be used widely in energy storage systems.

Key words: Phase change materials, Meso-porous carbon, Microstructure, Thermal performance

Yurong Liu, Yongpeng Xia, Kang An, Chaowei Huanga, Weiwei Cui, Sheng Wei, Rong Ji, Fen Xu, Huanzhi Zhang, Lixian Sun. Fabrication and characterization of novel meso-porous carbon/n-octadecane as form-stable phase change materials for enhancement of phase-change behavior[J]. J. Mater. Sci. Technol., 2019, 35(5): 939-945.

Figures/Tables 10

Fig. 1 XRD patterns of MPC and HMPC.

Fig. 2 Raman spectra of MPC and HMPC.

Fig. 3 TEM images of (a) MPC and (b) HMPC.

Fig. 4 (a) Nitrogen sorption isotherms and (b) PSDs of MPC and HMPC.

Fig. 5 FT-IR spectra of HMPC and the OD/HMPC composite PCMs.

Fig. 6 XRD patterns of the OD/HMPC composite PCMs.

Fig. 7 DSC thermograms of the OD/HMPC composite PCMs: (a) exothermic curves; (b) endothermic curves.

Table 1 Thermal properties of the OD/HMPC composite PCMs.

Sample code	Melting				Solidifying
	First peak		Second peak		First peak		Second peak
	Temperature(^oC)	Enthalpy(J/g)	Temperature(^oC)	Enthalpy(J/g)	Temperature(^oC)	Enthalpy(J/g)	Temperature(^oC)	Enthalpy(J/g)
CPCM-1	11.88	15.89			7.25	-16.89
CPCM-2	13.50	18.62			7.46	-18.68
CPCM-3	16.12	14.39	27.64	5.83	10.28	-13.20	23.02	-5.65
CPCM-4	16.31	15.82	27.83	6.82	9.83	-13.28	22.68	-5.68

Fig. 8 Temperature curves for melting and freezing time of the composite PCM, OD and HMPC: (a) heating curves; (b) freezing curves.

Fig. 9 (a) DSC exothermic curves, (b) DSC endothermic curves and (c) FT-IR spectra of the OD/HMPC composite PCMs before and after thermal cycling test.

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