Effects of nano-confinement on the hydrogen desorption properties of MgH2

被引：132
|
作者：
Konarova, Muxina [1 ]
Tanksale, Akshat [2 ]
Beltramini, Jorge Norberto [1 ]
Lu, Gao Qing [1 ]
机构：
[1] Univ Queensland, ARC Ctr Excellence Funct Nanomat, Brisbane, Qld 4072, Australia
[2] Monash Univ, Dept Chem Engn, Clayton, Vic 3800, Australia
来源：
NANO ENERGY | 2013年 / 2卷 / 01期
关键词：
Mesoporous material; Nano-confinement; Hydrogen storage; Enthalpy; Magnesium hydride; MESOPOROUS SILICA; MAGNESIUM HYDRIDE; STORAGE PROPERTIES; CARBON; COMPOSITES; COPOLYMER; TRIBLOCK; SORPTION; MODELS;
D O I：
10.1016/j.nanoen.2012.07.024
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：
MgH2 particles were synthesized by wet impregnation within the pores of the mesoporous materials SBA15 and CMK3. XRD and TEM results of Mg/SBA15 compounds revealed MgO surface impurities, indicating non-compatibility of SBA15 for the synthesis of MgH2 particles within SBA15 pores. No impurity phase was detected in Mg/CMK3 compounds. Thermal desorption behavior of MgH2/CMK3 compounds were studied by varying the MgH2 loading amount in CMK3. TPD results of MgH2/CMK3 compounds demonstrated that the onset and maximum hydrogen desorption temperatures were significantly influenced by the MgH2 loading amount. MgH2/CMK3 compounds with 20 wt% loading released hydrogen at a temperature of 253 degrees C. Its corresponding decomposition enthalpy was equal to 52.38+/-2.16 kJ/mol H-2. Furthermore, TEM images of this sample demonstrated the existence of well-dispersed MgH2 nanocrystallites (d similar to 4 nm) inside the pores of CMK3 template. (C) 2012 Elsevier Ltd. All rights reserved.
引用
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页码：98 / 104
页数：7
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