Preparation and Thermophysical Properties Study of Composite Phase Change Materials Based on Carbon Materials Derived from Waste Cigarette Butts

doi:10.19799/j.cnki.2095-4239.2025.0762

Abstract

Abstract:

Waste cigarette butts were recycled to prepare waste cigarette butt carbon materials (WCBC), which were then incorporated into a mixture of stearic acid (SA), palmitic acid (PA), and paraffin wax (PW) to fabricate PA-SA-PW/WCBC composite phase change materials (CPCMs). The composite phase change materials were characterized and tested for their micromorphology, chemical compatibility, heat storage/release performance, and thermal stability using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TG), and thermal conductivity analyzer. Additionally, the shape stability and photothermal conversion performance of the samples were evaluated, with a specific focus on investigating the enhancement effect of WCBC on the thermal conductivity of the composite phase change materials. The results indicated that no chemical reaction occurred between WCBC and the pure phase change material. The flake-like structure of WCBC enabled the formation of efficient thermal conduction pathways, thereby significantly improving thermal conductivity. When the mass fraction of WCBC was 5 wt%, the thermal conductivity of the composite phase change material increased by 12.80%, and the latent heat of fusion reached 160.72 J·g^-1. After 1180 seconds of light irradiation, the temperature of the composite phase change material was 13.8 ℃ higher than that of pure PA-SA-PW, confirming that WCBC could effectively enhance the photothermal conversion performance of the phase change material. In summary, the thermal conduction pathways formed by WCBC within the composite phase change materials can improve their thermal conductivity and heat storage performance, providing a novel approach for the development of low-cost composite phase change materials for temperature regulation in stadium buildings.

Key words: Phase change, Composites, Enthalpy, Waste Cigarette Butt, Photothermal conversion

CLC Number:

TK02

Pingchuan YANG, Yuhan FANG, Wenwei LAI, Changhui LIU. Preparation and Thermophysical Properties Study of Composite Phase Change Materials Based on Carbon Materials Derived from Waste Cigarette Butts[J]. Energy Storage Science and Technology, doi: 10.19799/j.cnki.2095-4239.2025.0762.

Figures/Tables 10

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种类	密度 (g·cm^-3)	纯度 (%)	熔点(℃)
棕榈酸(PA)	0.853	≥98%	60~66
硬脂酸(SA)	0.847	98%	67~72
石蜡 (PW)	0.90		50~52

样品	熔点T_m₍℃)		熔化潜热h_m (J∙g^-1)	结晶点T_c(℃)		结晶潜热h_c (J·g^-1)
PA-SA-PW	30.30	44.84	205.31	37.85	51.31	192.80
PA-SA-PW/WCBC_0.01	25.47	47.20	193.65	39.02	49.46	181.96
PA-SA-PW/WCBC_0.02	26.08	45.93	182.05	37.98	49.55	172.67
PA-SA-PW/WCBC_0.03	25.44	46.34	176.87	38.85	51.28	166.56
PA-SA-PW/WCBC_0.04	25.86	46.69	173.16	41.54	50.11	161.07
PA-SA-PW/WCBC_0.05	24.27	45.61	160.72	40.18	48.94	151.83