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Multimode hydriding/dehydriding reactions of CaPd
Kazutaka Ikeda1, Noriki Okuda, Kenji Ohoyama
1Institute of Materials Structure Science, KEK, Tsukuba 305-0801, Japan. kikeda@post.j-parc.jp
Calcium palladium (CaPd) exhibits temperature-dependent hydriding and dehydriding reactions. Below 523 K, reactions involve hydrogen solution, while above 523 K, they proceed via phase decomposition.
Area of Science:
- Materials Science
- Solid-state Chemistry
- Hydrogen Storage
Background:
- Calcium palladium (CaPd) is a material of interest for hydrogen storage applications.
- Understanding the reaction mechanisms of CaPd with hydrogen is crucial for optimizing its performance.
Purpose of the Study:
- To investigate the temperature-dependent hydriding and dehydriding behaviors of CaPd.
- To elucidate the underlying reaction pathways and mechanisms.
Main Methods:
- Combined thermodynamical studies (e.g., pressure-composition-temperature measurements).
- Structural studies (e.g., X-ray diffraction, microscopy).
Main Results:
- CaPd undergoes multimode hydriding/dehydriding reactions.
- In the temperature range of 273-523 K, reactions proceed via hydrogen solution/dissolution.
- In the temperature range of 523-773 K, reactions proceed via phase decomposition/recombination.
Conclusions:
- The reaction mechanism of CaPd with hydrogen is strongly temperature-dependent.
- CaPd can be utilized for hydrogen storage through different mechanisms depending on operating temperature.
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