4.7 Article

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

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 895, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162592

Keywords

Ceramic; Chemical synthesis; Thermochemistry; Kinetics

Funding

  1. Italian Ministry of Education, University and Research (MIUR) [PRIN2017-2017PMR932]

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This study introduces the use of polymer-derived SiOC ceramic aerogel as a host for hygroscopic magnesium sulphate, providing a new approach for seasonal thermal energy storage with controllable porosity and rapid hydration while avoiding composite breakage.
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 center dot 1 H2O and a complete hydration in 60 min under H2O saturated air. (C) 2021 Elsevier B.V. All rights reserved.

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