Hydrogen absorption and desorption kinetics of MgH2 catalyzed by MoS2 and MoO2

被引：92

作者：

Jia, Yanhong ^{[2
]}

Han, Shumin ^{[1
,2
]}

Zhang, Wei ^{[1
,2
]}

Zhao, Xin ^{[2
]}

Sun, Pengfei ^{[2
]}

Liu, Yanqing ^{[2
]}

Shi, He ^{[2
]}

Wang, Jiasheng ^{[2
]}

机构：

[1] Yanshan Univ, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China

[2] Yanshan Univ, Coll Environm & Chem Engn, Qinhuangdao 066004, Peoples R China

来源：

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2013年 / 38卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Hydrogen storage property; Magnesium hydride; Molybdenum disulfide; Molybdenum dioxide; Kinetics; SORPTION KINETICS; STORAGE PROPERTIES;

D O I：

10.1016/j.ijhydene.2012.12.018

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：

The catalytic effect of MoS2 and MoO2 on the hydrogen absorption/desorption kinetics of MgH2 has been investigated. It is shown that MoS2 has a superior catalytic effect over MoO2 on improving the hydrogen kinetic properties of MgH2. DTA results indicated that the desorption temperature decreased from 662.10 K of the pure MgH2 to 650.07 K of the MgH2 with MoO2 and 640.34 K of that with MoS2. Based on the Kissinger plot, the activation energy of the hydrogen desorption process is estimated to be 101.34 +/- 4.32 kJ mol(-1) of the MgH2 with MoO2 and 87.19 +/- 4.48 kJ mol(-1) of that with MoS2, indicating that the dehydriding process energy barrier of MgH2 can be reduced. The enhancement of the hydriding/dehydriding kinetics of MgH2 is attributed to the presence of MgS and Mo or MgO and Mo which catalyze the hydrogen absorption/desorption behavior of MgH2. The detailed comparisons between MoS2 and MoO2 suggest that S anion has superior properties than O anion on catalyzing the hydriding/dehydriding kinetics of MgH2. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

引用

页码：2352 / 2356

页数：5

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