Abstract
In this study, tetradecanol/graphene aerogel form-stable composite phase change materials were prepared by physical absorption. Two kinds of graphene aerogels were prepared using vitamin C and ethylenediamine to enhance the thermal conductivity of tetradecanol and prevent its leakage during phase transition. The form-stable composite phase change material exhibited excellent thermal energy storage capacity. The latent heat of the tetradecanol/graphene aerogel composite phase change materials with 5 wt.% graphene aerogel was similar to the theoretical latent heat of pure tetradecanol. The thermal conductivity of the tetradecanol/graphene aerogel composite phase change material improved gradually as the graphene aerogel content increased. The prepared tetradecanol/graphene aerogel composite phase change materials exhibited good thermal reliability and thermal stability, and no chemical reaction occurred between tetradecanol and the graphene aerogel. In addition, the latent heat and thermal conductivity of the tetradecanol/ethylenediamine-graphene aerogel composites were higher than those of tetradecanol/vitamin C-graphene aerogel composites, and the flexible shape of the ethylenediamine-graphene aerogel is suitable for application of the tetradecanol/ethylenediamine-graphene aerogel composite.
Highlights
With the limited fossil fuel reserves and the surge in greenhouse gas emissions, satisfying energy demands and reducing pollution will inevitably involve the promotion of green renewable energy technologies
This phenomenon corresponds to the preparation process in the Methods section, which vitamin C-graphene aerogel (VGA) exhibited a greater volume shrinkage than ethylenediamine-graphene aerogel (EGA)
The thermal conductivities of the TD/VGA form-stable composite phase change material (FS-CPCM) were 0.498 W/m·K and 1.031 W/m·K (i.e., 125% and 367% higher than that of pure TD, respectively). These results indicated that the thermal conductivity of the TD/Graphene aerogel (GA) FS-CPCMs was substantially improved by the GA
Summary
With the limited fossil fuel reserves and the surge in greenhouse gas emissions, satisfying energy demands and reducing pollution will inevitably involve the promotion of green renewable energy technologies. Porous carbon-based materials are highly attractive as potential PCM supports due to their high thermal conductivity, low density, and chemical stability These materials minimize the phase change enthalpy loss resulting from the support materials[15]. Fatty alcohol is an important organic solid–liquid PCM that has a high thermal energy storage density and low undercooling. This material is non-toxic and readily available. The GA-based composite PCM exhibits high thermal conductivity, high energy storage density, high light-absorbent rate and a form-stable shape that could be used in a battery thermal management system to maintain the temperature of batteries in a normal operating temperature range and could be used in high-power electronics to satisfy the high heat storage and dissipation requirements[21]. A GA-based composite PCM could directly utilize solar irradiation to drive the PCMs for energy conversion and could be used in thermoelectric energy harvesting device for thermal control and storage[22,23]
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