Preparation and Characterization of Sodium Sulfate/Silica Composite as a Shape-stabilized Phase Change Material by Sol-gel Method

doi:10.1016/S1004-9541(14)60047-1

Chinese Journal of Chemical Engineering ›› 2014, Vol. 22 ›› Issue (3): 360-364.DOI: 10.1016/S1004-9541(14)60047-1

• 材料与产品工程 • 上一篇

Preparation and Characterization of Sodium Sulfate/Silica Composite as a Shape-stabilized Phase Change Material by Sol-gel Method

郭强, 王涛

State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

收稿日期:2012-06-14 修回日期:2013-01-07 出版日期:2014-03-28 发布日期:2014-03-05
通讯作者: WANG Tao
基金资助:
Supported by the National Natural Science Foundation of China (2107611).

Preparation and Characterization of Sodium Sulfate/Silica Composite as a Shape-stabilized Phase Change Material by Sol-gel Method

GUO Qiang, WANG Tao

State Key Lab of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China

Received:2012-06-14 Revised:2013-01-07 Online:2014-03-28 Published:2014-03-05
Contact: WANG Tao
Supported by:
Supported by the National Natural Science Foundation of China (2107611).

摘要/Abstract

摘要： A sodium sulfate (Na₂SO₄)/silica (SiO₂) composite was prepared as a shape-stabilized solid-liquid phase change material by a sol-gel procedure using Na₂SiO₃ as the silica source. Na₂SO₄ in the composite acts as a latent heat storage substance for solid-liquid phase change, while SiO₂ acts as a support material to provide structural strength and prevent leakage of melted Na₂SO₄. The microstructure and composition of the prepared composite were characterized by the N₂ adsorption, transmission electron microscope (TEM), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction. The results show that the prepared Na₂SO₄/SiO₂ composite is a nanostructured hybrid of Na₂SO₄ and SiO₂ without new substances produced during the phase change. The macroscopic shape of the Na₂SO₄/SiO₂ composite after the melting and freezing cycles does not change and there is no leakage of Na₂SO₄. Determined by differential scanning calorimeter (DSC) analysis, the values of phase change latent heat of melting and freezing of the prepared Na₂SO₄/SiO₂ (50%, by mass) composite are 82.3 kJ·kg^-1 and 83.7 kJ·kg^-1, and temperatures of melting and freezing are 886.0 ℃ and 880.6 ℃, respectively. Furthermore, the Na₂SO₄/SiO₂ composite maintains good thermal energy storage and release ability even after 100 cycles of melting and freezing. The satisfactory thermal storage performance renders this composite a versatile tool for high-temperature thermal energy storage.

关键词: sodium sulfate, silicon dioxide, phase change material, shape-stabilized, sol-gel method

Abstract: A sodium sulfate (Na₂SO₄)/silica (SiO₂) composite was prepared as a shape-stabilized solid-liquid phase change material by a sol-gel procedure using Na₂SiO₃ as the silica source. Na₂SO₄ in the composite acts as a latent heat storage substance for solid-liquid phase change, while SiO₂ acts as a support material to provide structural strength and prevent leakage of melted Na₂SO₄. The microstructure and composition of the prepared composite were characterized by the N₂ adsorption, transmission electron microscope (TEM), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction. The results show that the prepared Na₂SO₄/SiO₂ composite is a nanostructured hybrid of Na₂SO₄ and SiO₂ without new substances produced during the phase change. The macroscopic shape of the Na₂SO₄/SiO₂ composite after the melting and freezing cycles does not change and there is no leakage of Na₂SO₄. Determined by differential scanning calorimeter (DSC) analysis, the values of phase change latent heat of melting and freezing of the prepared Na₂SO₄/SiO₂ (50%, by mass) composite are 82.3 kJ·kg^-1 and 83.7 kJ·kg^-1, and temperatures of melting and freezing are 886.0 ℃ and 880.6 ℃, respectively. Furthermore, the Na₂SO₄/SiO₂ composite maintains good thermal energy storage and release ability even after 100 cycles of melting and freezing. The satisfactory thermal storage performance renders this composite a versatile tool for high-temperature thermal energy storage.

Key words: sodium sulfate, silicon dioxide, phase change material, shape-stabilized, sol-gel method

郭强, 王涛. Preparation and Characterization of Sodium Sulfate/Silica Composite as a Shape-stabilized Phase Change Material by Sol-gel Method[J]. Chinese Journal of Chemical Engineering, 2014, 22(3): 360-364.

GUO Qiang, WANG Tao. Preparation and Characterization of Sodium Sulfate/Silica Composite as a Shape-stabilized Phase Change Material by Sol-gel Method[J]. Chin.J.Chem.Eng., 2014, 22(3): 360-364.

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Preparation and Characterization of Sodium Sulfate/Silica Composite as a Shape-stabilized Phase Change Material by Sol-gel Method

Preparation and Characterization of Sodium Sulfate/Silica Composite as a Shape-stabilized Phase Change Material by Sol-gel Method

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