Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 47, Issue 1, Pages 470-489Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.10.047
Keywords
Reactive milling; Magnesium hydride; Additives; Room temperature; Hydrogen storage
Categories
Funding
- Coordenacao de Aper-feicoamento de Pessoal de Nvel Superior-Brasil (CAPES) [001]
- Coordenacao de Aperfeicoamento de Pessoal de Nvel Superior-Brasil (CAPES) [88882.332725/2019-01]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo-Brasil (FAPESP) [2013/05987-8]
- Conselho Nacional de Desenvolvimento Cientfico e Tecnologico-Brasil (CNPq)
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In recent studies, it was found that high energy ball milling of Mg/MgH2 mixed with additives can reduce the temperature for H-2 absorption/desorption without altering thermodynamic properties. This research aimed to identify efficient hydrogen absorption/desorption catalysts at low temperatures, particularly at room temperature (RT). Among the additives tested in this study, MgH2-TiFe mixture showed the best performance, attributed to the strong catalytic action of TiFe and the high energy interfaces attracting hydrogen gas.
In recent works, it was noticed that Mg/MgH2 mixed with additives by high energy ball milling allows temperature reductions of H-2 absorption/desorption without necessarily changing thermodynamic properties. Thus, the objective of this work was to investigate which additives, mixed in low fractions with MgH2 powder would act as efficient hydrogen absorption/desorption catalysts at low temperatures, mainly at room temperature (RT). MgH2 mixtures with 2 mol% additives (Fe, Nb2O5 , TiAl and TiFe) were prepared by high energy reactive ball milling (RM). MgH2-TiFe mixture showed the best results, both during desorption at 330 degrees C and absorption at RT. The hydrogen absorption was approximate to 2.67 wt% H-2 in 1 h and approximate to 4.44 wt% H-2 in 16 h (40% and 67% of maximum theoretical capacity, respectively). The MgH2 -TiFe superior performance was attributed to the hydrogen attraction by the created high energy interfaces and strong TiFe catalytic action facilitating the H-2 flow during Mg/MgH2 reactions. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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