Fast hydrogen absorption/desorption kinetics in reactive milled Mg-8 mol% Fe nanocomposites

被引：25
|
作者：
Antiqueira, F. J. [1 ]
Leiva, D. R. [2 ]
Zepon, G. [2 ]
de Cunha, B. F. R. F. [3 ]
Figueroa, S. J. A. [4 ]
Botta, W. J. [2 ]
机构：
[1] Univ Fed Sao Carlos, Programa Posgrad Ciencia & Engn Mat, Rod Washington Luiz,Km 235,SP 310, BR-13565905 Sao Carlos, SP, Brazil
[2] Univ Fed Sao Carlos UFSCar, Dept Engn Mat, Rod Washington Luis,Km 235,SP 310, BR-13565905 Sao Carlos, SP, Brazil
[3] Univ Fed Minas Gerais, Dept Engn Met & Mat, Rua Espirito Santo 35, BR-30160030 Belo Horizonte, MG, Brazil
[4] CNPEM, LNLS, Rua Giuseppe Maximo Scolfaro 10000,CP 6192, BR-13083970 Campinas, SP, Brazil
来源：
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY | 2020年 / 45卷 / 22期
基金：
巴西圣保罗研究基金会;
关键词：
Hydrogen storage; Reactive milling; Nanocomposite; Magnesium hydride; Complex hydride; ENERGY IMPACT MODE; SORPTION PROPERTIES; STORAGE PROPERTIES; H-SORPTION; MECHANOCHEMICAL SYNTHESIS; MGH2; NANOCRYSTALLINE; MG2FEH6; HYDRIDE; OXIDES;
D O I：
10.1016/j.ijhydene.2020.02.213
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：
This study aims to better understand the Fe role in the hydrogen sorption kinetics of Mg-Fe composites. Mg-8 mol% Fe nanocomposites produced by high energy reactive milling (RM) for 10 h resulted in MgH2 mixed with free Fe and a low fraction of Mg2FeH6. Increasing milling time to 24 h allowed formation of a high fraction of Mg2FeH6 mixed with MgH2. The hydrogen absorption/desorption behavior of the nanocomposites reactive milled for 10 and 24 h was investigated by in-situ synchrotron X-ray diffraction, thermal analyses and kinetics measurements in Sieverts-type apparatus. It was found that both 10 and 24 h milled nanocomposites presents extremely fast hydrogen absorption/desorption kinetics in relatively mild conditions, i.e., 300-350 degrees C under 10 bar H-2 for absorption and 0.13 bar H-2 for desorption. Nanocomposites with MgH2, low Fe fraction and no Mg2FeH6 are suggested to be the most appropriate solution for hydrogen storage under the mild conditions studied. (C) Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：12408 / 12418
页数：11
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