Shape-stabilized phase change materials for solar energy storage: MgO and mg(OH)2 mixed with polyethylene glycol

Md Hasan Zahir; Mohammad Mizanur Rahman; Kashif Irshad; Mohammad Mominur Rahman

doi:10.3390/nano9121773

Shape-stabilized phase change materials for solar energy storage: MgO and mg(OH)₂ mixed with polyethylene glycol

Md Hasan Zahir^*
, Mohammad Mizanur Rahman
, Kashif Irshad
, Mohammad Mominur Rahman

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

179 Scopus citations

Abstract

Heat energy storage systems were fabricated with the impregnation method using MgO and Mg(OH)₂ as supporting materials and polyethylene glycol (PEG-6000) as the functional phase. MgO and Mg(OH)₂ were synthesized from the salt Mg(NO₃)·6H₂O by performing hydrothermal reactions with various precipitating agents. The precipitating agents were NaOH, KOH, NH₃, NH₃ with pamoic acid (PA), or (NH₄)₂CO₃. The result shows that the selection of the precipitating agent has a significant impact on the crystallite structure, size, and shape of the final products. Of the precipitating agents tested, only NaOH and NH₃ with PA produce single-phase Mg(OH)₂ as the as-synthesized product. Pore size distribution analyses revealed that the surfaces of the as-synthesized MgO have a slit-like pore structure with a broad-type pore size distribution, whereas the as-synthesized Mg(OH)₂ has a mesoporous structure with a narrow pore size distribution. This structure enhances the latent heat of the phase change material (PCM) as well as super cooling mitigation. The PEG/Mg(OH)₂ PCM also exhibits reproducible behavior over a large number of thermal cycles. Both MgO and Mg(OH)₂ matrices prevent the leakage of liquid PEG during the phase transition in phase change materials (PCMs). However, MgO/PEG has a low impregnation ratio and efficiency, with a low thermal storage capability. This is due to the large pore diameter, which does not allow MgO to retain a larger amount of PEG. The latent heat values of PEG-1000/PEG-6000 blends with MgO and Mg(OH)₂ were also determined with a view to extending the application of the PCMs to energy storage over wider temperature ranges.

Original language	English
Article number	1773
Journal	Nanomaterials
Volume	9
Issue number	12
DOIs	https://doi.org/10.3390/nano9121773
State	Published - Dec 2019

Bibliographical note

Publisher Copyright:
© 2019 by the authors. Licensee MDPI, Basel, Switzerland.

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Blended or pure polyethylene glycol
Hydrothermal process
MgO and Mg(OH) supporting materials
Phase change material
Solar thermal energy storage

ASJC Scopus subject areas

General Chemical Engineering
General Materials Science

Access to Document

10.3390/nano9121773

Cite this

@article{6307a595d60e410a8cdcaf06f84670ba,

title = "Shape-stabilized phase change materials for solar energy storage: MgO and mg(OH)2 mixed with polyethylene glycol",

abstract = "Heat energy storage systems were fabricated with the impregnation method using MgO and Mg(OH)2 as supporting materials and polyethylene glycol (PEG-6000) as the functional phase. MgO and Mg(OH)2 were synthesized from the salt Mg(NO3)·6H2O by performing hydrothermal reactions with various precipitating agents. The precipitating agents were NaOH, KOH, NH3, NH3 with pamoic acid (PA), or (NH4)2CO3. The result shows that the selection of the precipitating agent has a significant impact on the crystallite structure, size, and shape of the final products. Of the precipitating agents tested, only NaOH and NH3 with PA produce single-phase Mg(OH)2 as the as-synthesized product. Pore size distribution analyses revealed that the surfaces of the as-synthesized MgO have a slit-like pore structure with a broad-type pore size distribution, whereas the as-synthesized Mg(OH)2 has a mesoporous structure with a narrow pore size distribution. This structure enhances the latent heat of the phase change material (PCM) as well as super cooling mitigation. The PEG/Mg(OH)2 PCM also exhibits reproducible behavior over a large number of thermal cycles. Both MgO and Mg(OH)2 matrices prevent the leakage of liquid PEG during the phase transition in phase change materials (PCMs). However, MgO/PEG has a low impregnation ratio and efficiency, with a low thermal storage capability. This is due to the large pore diameter, which does not allow MgO to retain a larger amount of PEG. The latent heat values of PEG-1000/PEG-6000 blends with MgO and Mg(OH)2 were also determined with a view to extending the application of the PCMs to energy storage over wider temperature ranges.",

keywords = "Blended or pure polyethylene glycol, Hydrothermal process, MgO and Mg(OH) supporting materials, Phase change material, Solar thermal energy storage",

author = "Zahir, \{Md Hasan\} and Rahman, \{Mohammad Mizanur\} and Kashif Irshad and Rahman, \{Mohammad Mominur\}",

note = "Publisher Copyright: {\textcopyright} 2019 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2019",

month = dec,

doi = "10.3390/nano9121773",

language = "English",

volume = "9",

journal = "Nanomaterials",

issn = "2079-4991",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

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T1 - Shape-stabilized phase change materials for solar energy storage

T2 - MgO and mg(OH)2 mixed with polyethylene glycol

AU - Zahir, Md Hasan

AU - Rahman, Mohammad Mizanur

AU - Irshad, Kashif

AU - Rahman, Mohammad Mominur

PY - 2019/12

Y1 - 2019/12

N2 - Heat energy storage systems were fabricated with the impregnation method using MgO and Mg(OH)2 as supporting materials and polyethylene glycol (PEG-6000) as the functional phase. MgO and Mg(OH)2 were synthesized from the salt Mg(NO3)·6H2O by performing hydrothermal reactions with various precipitating agents. The precipitating agents were NaOH, KOH, NH3, NH3 with pamoic acid (PA), or (NH4)2CO3. The result shows that the selection of the precipitating agent has a significant impact on the crystallite structure, size, and shape of the final products. Of the precipitating agents tested, only NaOH and NH3 with PA produce single-phase Mg(OH)2 as the as-synthesized product. Pore size distribution analyses revealed that the surfaces of the as-synthesized MgO have a slit-like pore structure with a broad-type pore size distribution, whereas the as-synthesized Mg(OH)2 has a mesoporous structure with a narrow pore size distribution. This structure enhances the latent heat of the phase change material (PCM) as well as super cooling mitigation. The PEG/Mg(OH)2 PCM also exhibits reproducible behavior over a large number of thermal cycles. Both MgO and Mg(OH)2 matrices prevent the leakage of liquid PEG during the phase transition in phase change materials (PCMs). However, MgO/PEG has a low impregnation ratio and efficiency, with a low thermal storage capability. This is due to the large pore diameter, which does not allow MgO to retain a larger amount of PEG. The latent heat values of PEG-1000/PEG-6000 blends with MgO and Mg(OH)2 were also determined with a view to extending the application of the PCMs to energy storage over wider temperature ranges.

AB - Heat energy storage systems were fabricated with the impregnation method using MgO and Mg(OH)2 as supporting materials and polyethylene glycol (PEG-6000) as the functional phase. MgO and Mg(OH)2 were synthesized from the salt Mg(NO3)·6H2O by performing hydrothermal reactions with various precipitating agents. The precipitating agents were NaOH, KOH, NH3, NH3 with pamoic acid (PA), or (NH4)2CO3. The result shows that the selection of the precipitating agent has a significant impact on the crystallite structure, size, and shape of the final products. Of the precipitating agents tested, only NaOH and NH3 with PA produce single-phase Mg(OH)2 as the as-synthesized product. Pore size distribution analyses revealed that the surfaces of the as-synthesized MgO have a slit-like pore structure with a broad-type pore size distribution, whereas the as-synthesized Mg(OH)2 has a mesoporous structure with a narrow pore size distribution. This structure enhances the latent heat of the phase change material (PCM) as well as super cooling mitigation. The PEG/Mg(OH)2 PCM also exhibits reproducible behavior over a large number of thermal cycles. Both MgO and Mg(OH)2 matrices prevent the leakage of liquid PEG during the phase transition in phase change materials (PCMs). However, MgO/PEG has a low impregnation ratio and efficiency, with a low thermal storage capability. This is due to the large pore diameter, which does not allow MgO to retain a larger amount of PEG. The latent heat values of PEG-1000/PEG-6000 blends with MgO and Mg(OH)2 were also determined with a view to extending the application of the PCMs to energy storage over wider temperature ranges.

KW - Blended or pure polyethylene glycol

KW - Hydrothermal process

KW - MgO and Mg(OH) supporting materials

KW - Phase change material

KW - Solar thermal energy storage

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DO - 10.3390/nano9121773

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VL - 9

JO - Nanomaterials

JF - Nanomaterials

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M1 - 1773

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