Thermochemical heat storage performances of magnesium sulphate confined in polymer-derived SiOC aerogels

•Silicon oxycarbide aerogels can be used as a scaffold for magnesium sulphate.•Interconnected porosity of the aerogel increases the hydration rate of MgSO4.•Fast dehydration though Joule effect can restore the composite energy density. [Display omitted] The thermochemical heat storage performances o...

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Bibliographic Details
Published in:Journal of alloys and compounds 2022-02, Vol.895, p.162592, Article 162592
Main Authors: Zambotti, Andrea, Valentini, Francesco, Lodi, Emanuele, Pegoretti, Alessandro, Tyrpekl, Václav, Kohúteková, Soňa, Sorarù, Gian Domenico, Kloda, Matouš, Biesuz, Mattia
Format: Article
Language:English
Subjects:
Aerogels
Ceramic
Chemical synthesis
Energy storage
Heat storage
Hydration
Kinetics
Magnesium sulfate
Polymers
Porous media
Thermal energy
Thermochemistry
Water vapor
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Summary:•Silicon oxycarbide aerogels can be used as a scaffold for magnesium sulphate.•Interconnected porosity of the aerogel increases the hydration rate of MgSO4.•Fast dehydration though Joule effect can restore the composite energy density. [Display omitted] The thermochemical heat storage performances of hygroscopic magnesium sulphate (MgSO4) can be improved by dispersing it within a porous matrix. However, the host material must be able to bear the intense stresses developed by the hydration of the salt. In this work, we report the first use of a polymer-derived SiOC ceramic aerogel as host for the confinement of MgSO4 for seasonal thermal energy storage, providing a way to easily tune its final porosity to achieve controllable mass fractions of salt in the so-obtained composite. Besides, the distinctive mesoporosity of ceramic aerogels guarantee a free path for water vapour to rapidly hydrate MgSO4 while avoiding the breakage of the composite. Vacuum impregnation of the aerogel samples led to a composite with a maximum of 59.1%wt of MgSO4.1 H2O and a complete hydration in 60 min under H2O saturated air.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.162592