Abstract
In response to global energy problems, industrial waste heat storage systems are a useful strategy as important as clean energy. Slow magnesium oxide hydration rate and incomplete hydration are the main obstacles to the application of MgO/Mg(OH)2 to heat storage systems. In this study, porous structures are introduced into pure magnesium oxide materials to increase their specific surface area and enrich their pores, thereby increasing their hydration rate and conversion. The effective exothermic densities of the self-assembled micro-nano flower-like and spherical samples with high specific surface area are 955.6 kJ/kgMg(OH)2 and 1034.8 kJ/kgMg(OH)2, respectively, about 2 to 3 times that of commercially purchased magnesium hydroxide. Their hydration conversion rates are 51.0 % and 57.7 % at 20 min, respectively. They have potential for use in heat storage systems.
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