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

被引：27

作者：

Kim, Ji Woo ^{[1
,3
]}

Ahn, Jae-Pyoung ^{[2
]}

Kim, Do Hyun ^{[3
]}

Chung, Hee-Suk ^{[3
]}

Shim, Jae-Hyeok ^{[1
]}

Cho, Young Whan ^{[1
]}

Oh, Kyu Hwan ^{[3
]}

机构：

[1] Korea Inst Sci & Technol, Mat Devices Div, Seoul 136791, South Korea

[2] Korea Inst Sci & Technol, Adv Anal Ctr, Seoul 136791, South Korea

[3] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151742, South Korea

来源：

SCRIPTA MATERIALIA | 2010年 / 62卷 / 09期

关键词：

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

D O I：

10.1016/j.scriptamat.2010.01.033

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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.

引用

页码：701 / 704

页数：4

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