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

0548417 - ÚACH 2023 RIV NL eng J - Journal Article
Zambotti, A. - Valentini, F. - Lodi, E. - Pegoretti, A. - Tyrpekl, V. - Kohúteková, S. - Soraru, G. D. - Kloda, Matouš - Biesuz, Mattia
Thermochemical heat storage performances of magnesium sulphate confined in polymer-derived SiOC aerogels.
Journal of Alloys and Compounds. Roč. 895, FEB (2022), č. článku 162592. ISSN 0925-8388. E-ISSN 1873-4669
Institutional support: RVO:61388980 ; RVO:61389021
Keywords : Ceramic * Chemical synthesis * Kinetics * Thermochemistry
OECD category: Inorganic and nuclear chemistry; Materials engineering (UFP-V)
Impact factor: 6.2, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.jallcom.2021.162592

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.
Permanent Link: http://hdl.handle.net/11104/0324458