The Effect of Hydroxylated Multi-Walled Carbon Nanotubes on the Properties of Peg-Cacl2 Form-Stable Phase Change Materials

Lingyu Zheng,Xinfeng Wu,Xuelai Zhang,Weisan Hua,Fa Mao

doi:10.3390/en14051403

Abstract

Calcium ions can react with polyethylene glycol (PEG) to form a form-stable phase change material, but the low thermal conductivity hinders its practical application. In this paper, hydroxylated multi-walled carbon nanotubes (MWCNTs) with different mass are introduced into PEG1500·CaCl2 form-stable phase change material to prepare a new type of energy storage material. Carbon nanotubes increased the mean free path (MFP) of phonons and effectively reduced the interfacial thermal resistance between pure PEG and PEG1500·CaCl2 3D skeleton structure. Thermal conductivity was significant improved after increasing MWCNTs mass, while the latent heat decreases. At 1.5 wt%, composite material shows the highest phase change temperature of 42 °C, and its thermal conductivity is 291.30% higher than pure PEG1500·CaCl2. This article can provide some suggestions for the preparation and application of high thermal conductivity form-stable phase change materials.

Highlights

Hydroxylated Multi-Walled CarbonEnvironmental problems such as global warming are intensifying
Compared with traditional energy storage such as mechanical energy storage, chemical energy storage and electrical energy storage, the energy stored by Phase change materials (PCMs) shows some advantages as follows: additional energy consumed by latent heat storage is lower, so it is easier to control and safer
A new type of high thermal conductivity form-stable PCM was prepared. Series of methods such as differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Hot Disk thermal constant analysis are used to study the effect of hydroxylated multi-walled carbon nanotubes on PEG1500·CaCl2

Summary

Introduction

Hydroxylated Multi-Walled CarbonEnvironmental problems such as global warming are intensifying. Compared with traditional energy storage such as mechanical energy storage, chemical energy storage and electrical energy storage, the energy stored by PCMs shows some advantages as follows: additional energy consumed by latent heat storage is lower, so it is easier to control and safer. They are widely used in the temperature control field such as solar energy storage [3,4,5,6], green building [7,8,9], electronic equipment cooling systems [10,11,12], temperature adaptable textiles [13], and cold chain logistics [14,15,16], etc

Methods

Results

Conclusion