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- Title
The Inside‐Outs of Metal Hydride Dehydrogenation: Imaging the Phase Evolution of the Li‐N‐H Hydrogen Storage System.
- Authors
White, James L.; Baker, Alexander A.; Marcus, Matthew A.; Snider, Jonathan L.; Wang, Timothy C.; Lee, Jonathan R. I.; Kilcoyne, David A. L.; Allendorf, Mark D.; Stavila, Vitalie; El Gabaly, Farid
- Abstract
Complex metal hydrides provide high‐density hydrogen storage, which is essential for vehicular applications. However, the practical application of these materials is limited by thermodynamic and kinetic barriers present during the dehydrogenation and rehydrogenation processes as new phases form inside parent phases. An improved understanding of the mixed‐phase mesostructures and their interfaces will assist in improving cyclability. In this work, the phase evolution during hydrogenation of lithium nitride and dehydrogenation of lithium amide with lithium hydride is probed with scanning transmission X‐ray microscopy at the nitrogen K edge. With this technique, core–shell structures are observed in particles of both partially hydrogenated Li3N and partially dehydrogenated LiNH2 + 2LiH. To generate these structures, the rate‐limiting step must shift from internal hydrogen diffusion during hydrogenation to the formation of hydrogen gas at the surface during desorption.
- Subjects
HYDRIDES; HYDROGEN storage; DEHYDROGENATION; X-ray microscopy; LITHIUM hydride; LITHIUM amides
- Publication
Advanced Materials Interfaces, 2020, Vol 7, Issue 7, p1
- ISSN
2196-7350
- Publication type
Article
- DOI
10.1002/admi.201901905