MgSO4·7H2O for thermochemical energy storage: Hydration/dehydration kinetics and cyclability

doi:articletype:10.19799/j.cnki.2095-4239.2024.0875

Abstract

Abstract:

In recent decades, MgSO₄·7H₂O (epsomite) has attracted significant attention as a promising thermochemical-based thermal energy storage material due to its high theoretical energy density, wide availability, and affordability. Despite extensive research efforts, progress in achieving high-energy density has been limited, primarily due to inadequate understanding of its reaction mechanisms and unfavorable dehydration/hydration kinetics. This study systematically investigated the hydration/dehydration kinetics and cyclability of MgSO₄·7H₂O. The results reveal that the dehydration process is influenced by the heating rate, with an optimal rate of 5 ℃/min, resulting in a seven-step MgSO₄·7H₂O dehydration process with a dehydration heat close to the theoretical value. The reaction kinetic analysis indicated that the rate of hydration was approximately 50% lower than that of dehydration. In addition, thermal cycling tests of MgSO₄·7H₂O under the conditions of this study (small sample size) indicated good cyclability, with hydration rates increasing with increasing cycling numbers up to approximately 10 cycles where level-off occurs. These results are consistent with scanning electron microscopy analyses, which revealed the formation of cracks and channels in the salt hydrate particles, facilitating mass transfer and improved kinetics.

Key words: thermochemical energy storage, thermal analysis, thermal cycling, MgSO₄ hydration/dehydration kinetics

CLC Number:

TK 02

Jie CHEN, Hongkun MA, Yulong DING. MgSO₄·7H₂O for thermochemical energy storage: Hydration/dehydration kinetics and cyclability[J]. Energy Storage Science and Technology, 2024, 13(12): 4259-4271.

Figures/Tables 9

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References 31

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Heating rate	10 ℃/min	5 ℃/min	2 ℃/min	1 ℃/min
Heat flow/(J/g)	-1267	-1376	-1270	-1213
Onset/℃	115.4	113.6	106.9	104.2
Peak/℃	121.2	116.6	106.3	103.2
Endset/℃	149.8	134.8	111.0	106.6

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MgSO₄·7H₂O for thermochemical energy storage: Hydration/dehydration kinetics and cyclability

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