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Hydration reactivity enhancement of calcium oxide–based media for thermochemical energy storage

Guo, Rui and Funayama, Shigehiko and Kim, Seon Tae and Harada, Takuya and Takasu, Hiroki and Kato, Yukitaka (2021) Hydration reactivity enhancement of calcium oxide–based media for thermochemical energy storage. Energy Storage, 3. Wiley. doi: 10.1002/est2.232. ISSN 2578-4862.

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Official URL: https://doi.org/10.1002/est2.232


The calcium oxide/water/calcium hydroxide system is a promising material system for thermochemical energy storage (TCES). Its high reactivity under various experimental conditions during the cyclic operation of heat storage-and-release is a key challenge for practical applications. In this study, we developed a new type of highly durable TCES medium with hydration reactivity enhancement. The composite materials were prepared by heat treatment of a mixture of calcium carbonate and additives, consisting of tetraethoxysilane (TEOS) and a silane coupling agent, bis(3-triehoxysilylpropyl) pertetrasulfide (SCA). The kinetic performances of the composites and CaO were compared. It was observed that the additives promoted hydration reactivity at 450°C and 70 kPa, and 0.6 wt% composite exhibited the highest thermal output. Furthermore, it was found that the enhancement in hydration reactivity was affected by the experimental conditions as significant enhancements were observed when the experimental conditions were closer to equilibrium, while almost no enhancement was observed when the conditions were far from equilibrium or at a high vapor partial pressure. Sample characterization via X-ray diffractometry and scanning electron microscopy revealed that the agglomeration of CaO particle grains was alleviated by pinning effects, and the component that enhanced the hydration reactivity was identified as Ca2SiO4 nanoparticles.

Item URL in elib:https://elib.dlr.de/143847/
Document Type:Article
Title:Hydration reactivity enhancement of calcium oxide–based media for thermochemical energy storage
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Guo, RuiTokyo Institute of TechnologyUNSPECIFIEDUNSPECIFIED
Funayama, ShigehikoTokyo Institute of TechnologyUNSPECIFIEDUNSPECIFIED
Kim, Seon TaeUNSPECIFIEDhttps://orcid.org/0000-0002-4388-3996UNSPECIFIED
Harada, TakuyaTokyo Institute of TechnologyUNSPECIFIEDUNSPECIFIED
Takasu, HirokiTokyo Institute of TechnologyUNSPECIFIEDUNSPECIFIED
Kato, YukitakaTokyo Institute of TechnologyUNSPECIFIEDUNSPECIFIED
Date:9 February 2021
Journal or Publication Title:Energy Storage
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Calcium hydroxide, Calcium oxide, Composite material, heat output density, thermochemical energy storage.
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:High-Temperature Thermal Technologies
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Low-Carbon Industrial Processes, E - Thermochemical Processes
Location: Zittau
Institutes and Institutions:Institute of Low-Carbon Industrial Processes > High-Temperature Heat Pumps
Institute of Low-Carbon Industrial Processes > Low-Carbon Reducing Agents
Deposited By: Kim, SeonTae
Deposited On:01 Dec 2021 16:50
Last Modified:31 Jan 2022 15:46

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