High-performance CaO-based composites synthesized using a space-confined chemical vapor deposition strategy for thermochemical energy storage
The Calcium-Looping (CaL) process, based on the reversible carbonation/calcination of CaO, is a promising technology for thermochemical energy storage (TCES) in Concentrated Solar Power (CSP) plants. However, the major drawback of this technology is the rapid deactivation of CaO due to sintering. In...
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Veröffentlicht in: | Solar energy materials and solar cells 2020-03, Vol.206, p.110346, Article 110346 |
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Sprache: | eng |
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Zusammenfassung: | The Calcium-Looping (CaL) process, based on the reversible carbonation/calcination of CaO, is a promising technology for thermochemical energy storage (TCES) in Concentrated Solar Power (CSP) plants. However, the major drawback of this technology is the rapid deactivation of CaO due to sintering. In this work, we have synthesized CaO-based, inert oxide-stabilized composites through a space-confined chemical vapor deposition process. Different synthesis parameters such as the inert material (Al2O3, SiO2 or TiO2) used as the stabilizer and the CaO concentration in the sorbent were investigated. Among the three different promoters used to increase the resistance of CaO toward sintering, Al2O3 resulted in the most stable composites. The composite with only 5 mol.% Al showed an excellent CO2 uptake capacity, 0.59 g CO2/g composite, over 50 cycles without any deactivation. Based on the calculation, this composite maintained an energy density of 1.50 GJ/t after 50 cycles, corresponding to 87% of the theoretical maximum. This high stability is attributed to the unique synthetic strategy in which the thermally stable oxide nanoparticles deposited on the surface of CaO crystalline grain and prevented its aggregation and overgrowth.
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•Ca-based composites were synthesized by a facile chemical vapor deposition process.•The sintering of CaO crystalline grains were inhibited through inert oxide deposition.•Only 5 mol% of Al2O3 is required to effectively enhance the stability of heat storage.•The energy density of the composite still close to the theoretical value after 50 cycles. |
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ISSN: | 0927-0248 1879-3398 |
DOI: | 10.1016/j.solmat.2019.110346 |