Enabling thermal energy storage in structural cementitious composites with a novel phase change material microcapsule featuring an inorganic shell and a bio-inspired silica coating

Ismail, Abdulmalik; Bahmani, Maysam; Wang, Xiaodong; Aday, Anastasia; Odukomaiya, Adewale; Wang, Jialai

doi:10.1016/j.est.2024.110677

Enabling thermal energy storage in structural cementitious composites with a novel phase change material microcapsule featuring an inorganic shell and a bio-inspired silica coating

Journal Article · Sun Feb 04 23:00:00 EST 2024 · Journal of Energy Storage

DOI:https://doi.org/10.1016/j.est.2024.110677· OSTI ID:2316141

Ismail, Abdulmalik ^[1]; Bahmani, Maysam ^[1]; Wang, Xiaodong ^[1]; ^[2]; ^[2]; Wang, Jialai ^[1]

Univ. of Alabama, Tuscaloosa, AL (United States)
National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Phase change material (PCM) microcapsules offer a promising approach for integrating PCM into building materials for efficient thermal energy storage. Here, this study presents the development of a novel PCM microcapsule specifically designed for incorporation into cementitious materials. The microcapsule consists of a low-cost PCM core derived from vegetable oil by-products and a durable inorganic shell made from cenosphere, a hollow fly ash generated from coal burning power plants. A novel process is developed to apply a silica coating to these cenosphere-based PCM microcapsules (CPCM), resulting in bioinspired-silica-coated CPCM microcapsules (BCPCM). This coating process draws inspiration from marine microorganism-based silica production and utilizes low-cost sodium silicate as a precursor, enabling eco-friendly and cost-effective manufacturing at ambient temperature and mild pH conditions. The morphology, chemical stability, and thermal properties of the BCPCM along with its thermo-mechanical performance in cementitious composites were comprehensively analyzed. Experimental results demonstrate successful silica deposition on BCPCM, leading to enhanced latent heat properties of the produced BCPCM. With the silica coating, BCPCM exhibits a 50 °C delay in thermal decomposition compared to CPCM, enhancing fire resistance and preventing premature PCM leakage of the microcapsule. The bioinspired silica coating effectively restores over 10% of the strength loss for each percent increase in CPCM incorporated into the mortar. The thermal performance experiments reveal that increasing the BCPCM content reduces temperature peaks and rates of temperature increase, indicating an improved capacity for thermal energy storage. This new PCM microcapsule provides a cost-effective solution to integrate thermal energy storage to cementitious material, as evidenced that over 30% of aggregates (in volume) can be replaced by the microcapsule without a drastic loss of strength.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office; National Science Foundation (NSF)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 2316141

Report Number(s):: NREL/JA--5500-88782; MainId:89561; UUID:cec9e780-e25f-4b49-8899-0aa514d4b575; MainAdminId:71973

Journal Information:: Journal of Energy Storage, Journal Name: Journal of Energy Storage Vol. 83; ISSN 2352-152X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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cementitious materials
microencapsulation
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Enabling thermal energy storage in structural cementitious composites with a novel phase change material microcapsule featuring an inorganic shell and a bio-inspired silica coating

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