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Type: Congresso
Title: Mg-based Nanocomposites For Hydrogen Storage Containing Ti-cr-v Alloys As Additives
Author: Floriano
Ricardo; Leiva
Daniel Rodrigo; Dessi
Joao Guilherme; Cesario Asselli
Alexandre Augusto; Jorge Junior
Alberto Moreira; Botta
Walter Jose
Abstract: In this study, we have investigated the synthesis, microstructure and hydrogen storage properties of Mg-based nanocomposites containing different concentrations of TiCrV and TiCr1.2V0.8 alloys. The Mg-based nanocomposites of Mg containing Ti-Cr-V additives were prepared by reactive milling (RM) under hydrogen atmosphere. The structural characterization revealed the presence of the beta-MgH2,gamma-MgH2 and BCC phases in the powders samples after RM. In addition, a very refined and homogenous microstructure with average MgH2 crystallite size of around 10-12 nm was observed, including a nanometric dispersion of the additives in the magnesium hydride matrix. The doping with TiCrV and TiCr1,2V0,8 greatly improves the hydrogen desorption behavior of Mg in comparison with the sample without additive, resulting in the lowest onset temperature (240 degrees C) for the sample containing 5% mol. of TiCrV. Very fast absorption and desorption kinetics at 275 degrees C and 300 degrees C (7 minutes and 5 minutes for full desorption and absorption, respectively) were observed in the samples containing TiCrV and TiCr1,2V0,8 without any notable difference between the type of additive used in comparison with the pure sample. However, a slight reduction in hydrogen capacity is observed in the mixtures than for the pure sample (6.7 wt.% against 7.3 wt.%).
Subject: Hydrogen Storage
Magnesium Hydride
Reactive Milling
Bcc Alloys
Editor: Universidade Federal de Sao Carlos, Dept Engenharia Materials
São Carlos
Citation: Materials Research-ibero-american Journal Of Materials. Universidade Federal De Sao Carlos, Dept Engenharia Materials, v. 19, p. 80 - 85, 2016.
Rights: aberto
Identifier DOI: 10.1590/1980-5373-MR-2016-0179
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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