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

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

储能科学与技术 ›› 2024, Vol. 13 ›› Issue (12): 4259-4271.doi: articletype:10.19799/j.cnki.2095-4239.2024.0875

收稿日期:2024-09-18 修回日期:2024-09-30 出版日期:2024-12-28 发布日期:2024-12-23

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

Jie CHEN(), Hongkun MA(), Yulong DING()

Birmingham Centre for Energy Storage, University of Birmingham, Edgbaston, BirminghamB15 2TT, UK

Received:2024-09-18 Revised:2024-09-30 Online:2024-12-28 Published:2024-12-23
Contact: Hongkun MA, Yulong DING E-mail:j.chen.9@bham.ac.uk;h.ma.5@bham.ac.uk;y.ding@bham.ac.uk
About author:CHEN Jie, PhD, facility manager, her research focuses on thermochemical energy storage and advanced material characterization techniques, E-mail: j.chen.9@bham.ac.uk; Corresponding author:
MA Hongkun, PhD, researcher. her research focuses on thermochemical energy storage, E-mail: h.ma.5@bham.ac.uk
DING Yulong, professor, his research interests cover both fundamental and applied aspects, The fundamental research focuses on multiphase transport phenomena across different length scales, while the applied research emphasizes new energy storage technologies and microstructured materials for heat transfer intensification and energy harvesting/storage applications, E-mail: y.ding@bham.ac.uk.

摘要/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

中图分类号:

TK 02

. [J]. 储能科学与技术, 2024, 13(12): 4259-4271.

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.

图/表 9

参考文献 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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