Microstructural control by freeze-casting of CaO architectures for improved and stable thermochemical energy storage performance

This study investigates the development of porous calcium-based monoliths via freeze-casting (FC) as a novel approach for thermochemical energy storage, particularly within the Calcium Looping (CaL) process. The freeze-casting technique enabled the fabrication of scaffolds with controlled porosity u...

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Autores: Amghar, Nabil, Ivorra-Martinez, Juan, Perejón Pazo, Antonio, Hanaor, Dorian, Gurlo, Aleksander, Ramírez Rico, Joaquín, Pérez Maqueda, Luis Allan, Sánchez Jiménez, Pedro Enrique
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/175655
Acceso en línea:https://hdl.handle.net/11441/175655
https://doi.org/10.1016/j.est.2025.116681
Access Level:acceso abierto
Palabra clave:CaCO3
Calcium Looping
Freeze-casting
Porous structures
Thermochemical energy storage
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spelling Microstructural control by freeze-casting of CaO architectures for improved and stable thermochemical energy storage performanceAmghar, NabilIvorra-Martinez, JuanPerejón Pazo, AntonioHanaor, DorianGurlo, AleksanderRamírez Rico, JoaquínPérez Maqueda, Luis AllanSánchez Jiménez, Pedro EnriqueCaCO3Calcium LoopingFreeze-castingPorous structuresThermochemical energy storageThis study investigates the development of porous calcium-based monoliths via freeze-casting (FC) as a novel approach for thermochemical energy storage, particularly within the Calcium Looping (CaL) process. The freeze-casting technique enabled the fabrication of scaffolds with controlled porosity using polyvinyl alcohol (PVA) as a binder. Experimental results demonstrated that freeze-cast monoliths exhibited superior multicycle performance under various carbonation and calcination conditions. The FC-CaCO3 monolith achieved the highest residual conversion of 68.1 % under mild vacuum calcination conditions (780 °C, 0.1 bar CO2), significantly surpassing other configurations. Tests conducted in an inert atmosphere also yielded favorable results, with a conversion of 56.1 %, outperforming equivalent raw powder samples. The enhanced performance is attributed to improved CO2 interaction with the porous structure, mitigating sintering effects and preserving active surface area. Morphological observations by X-ray tomography and SEM confirmed limited particle sintering after multiple cycles, maintaining a reactive surface that supported consistent conversion rates. The pore size distribution of the material evolves upon cycling resulting in an increased microporosity, while the pore network maintains a low tortuosity (τ ~ 1.5–2.0). The addition of dopants such as ZrO2 and SiO2 did not enhance performance, as the monoliths' inherent structure provided sufficient stability. These findings highlight freeze-casting as a promising method for creating advanced porous materials suitable for energy storage applications.ElsevierQuímica InorgánicaFísica de la Materia CondensadaMinisterio de Ciencia e Innovación (MICIN). España2025info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/175655https://doi.org/10.1016/j.est.2025.116681reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésJournal of Energy Storage, 125, 116681.TED2021-131839BC22PDC2021-121552-C21PID2022-140815OBC22https://doi.org/10.1016/j.est.2025.116681info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1756552026-06-17T12:51:07Z
dc.title.none.fl_str_mv Microstructural control by freeze-casting of CaO architectures for improved and stable thermochemical energy storage performance
title Microstructural control by freeze-casting of CaO architectures for improved and stable thermochemical energy storage performance
spellingShingle Microstructural control by freeze-casting of CaO architectures for improved and stable thermochemical energy storage performance
Amghar, Nabil
CaCO3
Calcium Looping
Freeze-casting
Porous structures
Thermochemical energy storage
title_short Microstructural control by freeze-casting of CaO architectures for improved and stable thermochemical energy storage performance
title_full Microstructural control by freeze-casting of CaO architectures for improved and stable thermochemical energy storage performance
title_fullStr Microstructural control by freeze-casting of CaO architectures for improved and stable thermochemical energy storage performance
title_full_unstemmed Microstructural control by freeze-casting of CaO architectures for improved and stable thermochemical energy storage performance
title_sort Microstructural control by freeze-casting of CaO architectures for improved and stable thermochemical energy storage performance
dc.creator.none.fl_str_mv Amghar, Nabil
Ivorra-Martinez, Juan
Perejón Pazo, Antonio
Hanaor, Dorian
Gurlo, Aleksander
Ramírez Rico, Joaquín
Pérez Maqueda, Luis Allan
Sánchez Jiménez, Pedro Enrique
author Amghar, Nabil
author_facet Amghar, Nabil
Ivorra-Martinez, Juan
Perejón Pazo, Antonio
Hanaor, Dorian
Gurlo, Aleksander
Ramírez Rico, Joaquín
Pérez Maqueda, Luis Allan
Sánchez Jiménez, Pedro Enrique
author_role author
author2 Ivorra-Martinez, Juan
Perejón Pazo, Antonio
Hanaor, Dorian
Gurlo, Aleksander
Ramírez Rico, Joaquín
Pérez Maqueda, Luis Allan
Sánchez Jiménez, Pedro Enrique
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Química Inorgánica
Física de la Materia Condensada
Ministerio de Ciencia e Innovación (MICIN). España
dc.subject.none.fl_str_mv CaCO3
Calcium Looping
Freeze-casting
Porous structures
Thermochemical energy storage
topic CaCO3
Calcium Looping
Freeze-casting
Porous structures
Thermochemical energy storage
description This study investigates the development of porous calcium-based monoliths via freeze-casting (FC) as a novel approach for thermochemical energy storage, particularly within the Calcium Looping (CaL) process. The freeze-casting technique enabled the fabrication of scaffolds with controlled porosity using polyvinyl alcohol (PVA) as a binder. Experimental results demonstrated that freeze-cast monoliths exhibited superior multicycle performance under various carbonation and calcination conditions. The FC-CaCO3 monolith achieved the highest residual conversion of 68.1 % under mild vacuum calcination conditions (780 °C, 0.1 bar CO2), significantly surpassing other configurations. Tests conducted in an inert atmosphere also yielded favorable results, with a conversion of 56.1 %, outperforming equivalent raw powder samples. The enhanced performance is attributed to improved CO2 interaction with the porous structure, mitigating sintering effects and preserving active surface area. Morphological observations by X-ray tomography and SEM confirmed limited particle sintering after multiple cycles, maintaining a reactive surface that supported consistent conversion rates. The pore size distribution of the material evolves upon cycling resulting in an increased microporosity, while the pore network maintains a low tortuosity (τ ~ 1.5–2.0). The addition of dopants such as ZrO2 and SiO2 did not enhance performance, as the monoliths' inherent structure provided sufficient stability. These findings highlight freeze-casting as a promising method for creating advanced porous materials suitable for energy storage applications.
publishDate 2025
dc.date.none.fl_str_mv 2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/175655
https://doi.org/10.1016/j.est.2025.116681
url https://hdl.handle.net/11441/175655
https://doi.org/10.1016/j.est.2025.116681
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Journal of Energy Storage, 125, 116681.
TED2021-131839BC22
PDC2021-121552-C21
PID2022-140815OBC22
https://doi.org/10.1016/j.est.2025.116681
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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