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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(NO 3 )·6H 2 O by performing hydrothermal reactions with various precipitating agents. The precipitating agents were NaOH, KOH, NH 3 , NH 3 with pamoic acid (PA), or (NH 4 ) 2 CO 3 . 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 NH 3 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.

Shape-Stabilized Phase Change Materials for Solar Energy Storage: MgO and Mg(OH)2 Mixed with Polyethylene Glycol