DSpace at KIST: In situ transmission electron microscopy study on microstructural changes in NbF5-doped MgH2 during dehydrogenation

In situ transmission electron microscopy study on microstructural changes in NbF5-doped MgH2 during dehydrogenation

Authors: Kim, Ji Woo; Ahn, Jae-Pyoung; Kim, Do Hyun; Chung, Hee-Suk; Shim, Jae-Hyeok; Cho, Young Whan; Oh, Kyu Hwan

Abstract: Microstructural changes in NbF5-doped MgH2 during the dehydrogenation reaction (MgH2 --> Mg + H-2) have been investigated by in situ heating transmission electron microscopy. Nanocrystalline MgH2 shows fast hydrogen sorption kinetics, as well as a high density of defects induced by high-energy ball milling. Since the network-structured Nb layer covering Mg grains acts both as an impediment to grain growth of Mg and a gateway for hydrogen diffusion by forming metastable NbH1-x the improved kinetics can be maintained during hydrogen cycling. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keywords: HYDROGEN SORPTION KINETICS; NI NANO-PARTICLE; TEM CHARACTERIZATION; MAGNESIUM HYDRIDE; STORAGE MATERIALS; H-DESORPTION; NB2O5; NANOCOMPOSITE; EVOLUTION; SEM; HYDROGEN SORPTION KINETICS; NI NANO-PARTICLE; TEM CHARACTERIZATION; MAGNESIUM HYDRIDE; STORAGE MATERIALS; H-DESORPTION; NB2O5; NANOCOMPOSITE; EVOLUTION; SEM; Hydrogen storage; Hydrides; Microstructure; In situ transmission electron microscopy

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