Surface modification of MgH2 by ZrCl4 to tailor the reversible hydrogen storage performance

被引：76

作者：

Kumar, Sanjay ^{[1
,2
]}

Jain, Ankur ^{[1
]}

Yamaguchi, S. ^{[3
]}

Miyaoka, H. ^{[1
]}

Ichikawa, T. ^{[1
,4
]}

Mukherjee, A. ^{[2
]}

Dey, G. K. ^{[2
]}

Kojima, Y. ^{[1
,3
]}

机构：

[1] Hiroshima Univ, Inst Adv Mat Res, Higashihiroshima 7398530, Japan

[2] BARC, Mat Proc & Corros Engn Div, Mumbai 400085, Maharashtra, India

[3] Hiroshima Univ, Grad Sch Adv Sci Matter, Higashihiroshima 7398530, Japan

[4] Hiroshima Univ, Grad Sch Integrated Arts & Sci, Higashihiroshima 7398521, Japan

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2017年 / 42卷 / 09期

基金：

奥地利科学基金会;

关键词：

Catalysis; Kinetics; Thermodynamics; ZrCl4; Sorption; Activation energy; SORPTION KINETICS; TI; DISSOCIATION; ABSORPTION; ADSORPTION; SYSTEMS; NB2O5; FE; NI; CO;

D O I：

10.1016/j.ijhydene.2017.01.193

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Zirconium tetrachloride (ZrCl4) is one of the best catalysts for improving the reversible hydrogen storage performance of the MgH2 Mg system. MgH2 catalyzed by ZrCl4 shows a remarkably reduced apparent activation energy, which leads to improved dehydrogenation and rehydrogenation kinetics. X-ray photoelectron spectroscopy (XPS) revealed the chemical state of ZrCl4 as ZrCl3 and metallic Zr after ball milling with MgH2. The in situ-formed ZrCl3 and metallic Zr showed good catalytic effect on MgH2, which substantially lowered the dehydrogenation and rehydrogenation temperatures. The scanning electron microstructure analysis revealed the excellent grain refinement property of the catalyst to reduce the crystallite size of MgH2 during ball-milling. The decreased crystallite size reduces the diffusion path length of hydrogen and increases the active surface area of MgH2 Mg, which eventually enhances the dehydrogenation and rehydrogenation kinetics. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：6152 / 6159

页数：8

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