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DOE OSTI · 1798094

AMPP Newsletter (Jun 2021)

Mondragon, Krystal L.
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Abstract

Welcome to our June 2021 issue of the AMPP newsletter. I hope the information you find within this newsletter allows you, as either a new addition to AMPP or as a long-term AMPP family member, to gain a better understanding of our organization and how we are working to meet not just our mission deliverables of today, but preparing for our future. In this newsletter issue the articles are dedicated to the principle of how we do work is as important as what we do. AMPP is known for excellence in our NNSA and DOE Missions execution. In this issue we are highlighting our Heat Source Final Assembly (HSFA) manufacturing efforts. Although what we produce for our HSFA customer is important their faith in us as an organization is just as much based on how we perform work to ensure that we safely and securely produce a quality product. We have added a new section to the newsletter called the “Group Leader Corner” where in this issues Chasity Kolar, the Group Leader for AMPP-3, discusses what it means to have a questioning attitude.

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Mondragon, Krystal L.. 2021-06-01. AMPP Newsletter (Jun 2021). https://doi.org/10.2172/1798094

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DOE OSTI2026

Cyclic moisture reactivation of calcium sorbents for long duration thermochemical energy storage

The transition to a flexible and reliable energy infrastructure, using electro-thermal energy generation technologies such as geothermal, concentrated solar power, and nuclear, usually demands simultaneous advancement of thermal energy storage (TES) to support on-demand electricity generation and industrial applications while mitigating the inherent intermittency of renewable energy sources and power outages from direct energy generation. Among TES technologies, thermochemical energy storage (TCES) based on calcium looping emerges as a compelling high-power energy storage candidate due to its high reaction enthalpy, compatibility with elevated operating temperatures, and abundance of low-cost materials. However, the long-term durability of calcium-based sorbents for TCES is hindered by surface sintering and particle aggregation, leading to performance degradation over repeated thermal cycles. This study explores a moisture hydration-based strategy to regenerate a degraded calcium sorbent and mitigate performance degradation for long duration TCES. The addition of moisture transforms calcium oxide into calcium hydroxide and produces intercalation water layers, associated with a regenerated surface area and reduced calcium oxide crystallite size. Both these effects are beneficial in restoring the sorbents' reactivity for carbonization. Additionally, an optimized hydration-assisted reactivation protocol balances the recovered energy storage capacity with heating penalty required for moisture removal from hydrated samples, resulting in an enhanced energy storage capacity up to 176% compared to benchmark sorbents that undergo cycling without reactivation after 60 cycles. In conclusion, these results highlight the potential of hydration-assisted reactivation to enhance the long-term performance of TCES, providing an effective pathway to advancing electro-thermal storage technologies.

36 MATERIALS SCIENCE↗