Study on hydrogen storage properties of Mg nanoparticles confined in carbon aerogels

被引:89
作者
Liu, Yana [1 ,2 ]
Zou, Jianxin [1 ,2 ]
Zeng, Xiaoqin [1 ,2 ,3 ,4 ]
Wu, Xiaomei [1 ,2 ]
Tian, Huyong [5 ]
Ding, Wenjiang [1 ,2 ,3 ,4 ]
Wang, Jun [5 ]
Walter, Anastasia [1 ,2 ]
机构
[1] Shanghai Jiao Tong Univ, Shanghai Engn Res Ctr Mg Mat & Applicat, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China
[3] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composite, Shanghai 200240, Peoples R China
[4] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[5] Hubei Univ, Sch Phys & Elect Technol, Wuhan 430062, Peoples R China
基金
高等学校博士学科点专项科研基金;
关键词
Nanoconfinement; Carbon aerogel; Mg nanoparticle; Hydrogen storage; MAGNESIUM; SORPTION; KINETICS; SIZE;
D O I
10.1016/j.ijhydene.2013.02.012
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
Magnesium nanoparticles confined in carbon aerogels were successfully synthesized through hydrogenation of infiltrated dibutyl-magnesium followed by hydrogen desorption at 623 K. The average crystallite size of Mg nanoparticle is calculated to be 19.3 nm based on X-ray diffraction analyses. TEM observations showed that the size of MgH2 particle is mainly distributed in the range from 5.0 to 20.0 nm, with a majority portion smaller than 10.0 nm. The hydrogenation and dehydrogenation enthalpies of the confined Mg are determined to be -65.1 +/- 1.56 kJ/mol H-2 and 68.8 +/- 1.03 kJ/mol H-2 by Pressure-composition-temperature tests, respectively, slightly lower than the corresponding enthalpies for pure Mg. In addition, the apparent activation energy for hydrogen absorption is determined to be 29.4 kJ/mol H-2, much lower than that of the micro-size Mg particles. These results indicate that the thermodynamic and absorption kinetic properties of confined Mg nanoparticles can be significantly improved due to the `nanosize effect'. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:5302 / 5308
页数:7
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