Preparation and Properties of Cu Particles Loaded Foam-based Phase Change Composites

doi:10.7503/cjcu20210619

Abstract

Abstract:

The carbon foam（CF） was made from melamine foam（MF） through high temperature carbonization， and was utilized as supporting matrix. The copper particles were deposited on the foam skeleton by redox reaction with copper chloride（CuCl₂） and hydrazine hydrate（N₂H₄·H₂O） as precursors. Subsequently， polyethylene glycol（PEG） was encapsulated into the matrix to fabricate phase change composites by vacuum impregnation method. The structural morphology and thermal properties of the fabricated phase change composites were studied by scanning electron microscopy（SEM）， X-ray diffraction（XRD）， differential scanning calorimetry（DSC） and Infrared thermal imager. The results showed that the Cu particles were uniformly and densely deposited on the skeleton surface of CF when the concentration of CuCl₂ solution was 1.0 mol/L. The fabricated phase change composite demonstrated good leakage-proof property， the phase change latent heat was as high as 145.2 J/g， the thermal efficiency was higher than 80%， and the photo-thermal conversion efficiency reached up to 83.8 %， which exhibiting excellent heat storage capacity and temperature regulation performance. This paper provides a strategy for the fabrication of phase change composites with excellent comprehensive performances， which is conducive to broaden its applications.

Key words: Phase change composite, Copper particles, Melamine foam, Thermal energy storage property

CLC Number:

O642

TrendMD:

CHU Yao, WANG Shuo, ZHANG Zinuo, WANG Yibo, CAI Yibing. Preparation and Properties of Cu Particles Loaded Foam-based Phase Change Composites[J]. Chem. J. Chinese Universities, 2022, 43(2): 20210619.

Figures/Tables 10

Scheme 1 Preparation process of phase change composites

Fig.1 SEM images of internal skeleton of MF, CF and CF@Cu?x（A） MF；（B） CF；（C）CF@Cu-0.5；（D） CF@Cu-0.75；（E） CF@Cu-1.0；（F） CF@Cu-1.25；（G） CF@Cu-1.5.

Fig.2 XRD paterns of CF and CF@Cu?1.0

Fig.3 SEM images of CF@PEG and CF@Cu?1.0/PEG（A， B） CF@PEG；（C， D） CF@Cu-1.0/PEG.

Scheme 2 Leakage?proof performance of the samples during heating and compression

Fig.4 DSC curves of pure PEG, CF@PEG and CF@Cu?x/PEG（A） Melting process；（B） crystallization process.

Table 1 Detailed thermophysical parameters of PEG, CF@PEG and CF@Cu-x/PEG

Sample	T_mi/℃	T_mp/℃	T_me/℃	ΔH_m/（J·g^-1）	T_ci/℃	T_cp/°C	T_ce/℃	ΔH_c/（J?g^-1）
PEG 2000	41.6	52.3	57.1	178.3	23.7	28.8	35.8	164.0
CF@PEG	39.3	51.9	56.9	166.1	26.4	32.4	37.0	161.0
CF@Cu?0.5/PEG	38.8	52.4	55.7	153.3	26.9	33.3	38.3	146.0
CF@Cu?0.75/PEG	38.5	52.4	55.5	150.3	27.0	32.8	37.7	144.4
CF@Cu?1.0/PEG	38.9	52.4	56.6	145.2	26.5	32.2	36.6	141.2
CF@Cu?1.25/PEG	41.5	52.9	56.6	142.9	26.6	32.1	35.8	135.3
CF@Cu?1.5/PEG	39.0	53.1	56.8	139.1	26.7	31.3	36.0	133.0

Fig.5 Infrared thermography of CF and CF@Cu?1.0/PEG composite（A） Heating process；（B） cooling process.

Fig.6 Thermal energy storage and release process of different samples

Scheme 3 Mechanism for photo?thermal conversion of the fabricated phase change composites

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