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Characterization of hydrogen storage properties of bulk Mg-based nanocomposites produced by equal channel angular pressing (ECAP)


One of the key challenges in developing hydrogen economy is hydrogen storage. Mg-based hydrides present the highest reversible hydrogen capacity per unit mass and unit volume, being the most promising. However, the hydrogen sorption in magnesium is relatively slow and occurs at relatively elevated temperature, and it is low the stability against O2 and moisture. In the 1990s decade, with the production of nanostructures by means of high energy ball milling (HEBM) technique, and Mg-based nanocomposites (by using appropriate catalysts), the kinetics were significantly increased. The HEBM disadvantages are high cost, and the many precautions to keep the material dense and pure, minimizing fire risks and degradation of hydrogen sorption capacities under air. In the past few years, Mg-based alloys have been developed by Severe Plastic Deformation techniques (SPD), such as equal angular channel pressing (ECAP), high pressure torsion (HPT), and cold rolling (CR). These techniques permit to produce nanostructures, but in bulk forms, which offer higher air resistance, safety, and viability scaled-up to industrial level, in comparison with powders. Bulk hydrides of 2Mg-Fe mixtures processed by HPT exhibited better or similar properties in comparison with precursor powders, and Mg-Pd mixtures by ARB, and pure Mg by ECAP, exhibited preferential orientation ((002) in Mg), which favored hydrogenations properties. The ECAP method was mainly applied for commercial or cast alloys, i.e. without the most studied catalyst. This project proposes to develop Mg-based nanocomposites by ECAP, parting from mixtures of Mg with catalyst (Fe, Ti and CNT), and to study the microstructure control by ECAP with catalysts. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DE LIMA ANDREANI, GISELE FERREIRA; MARTINS TRIQUES, MARIA REGINA; LEIVA, DANIEL RODRIGO; ROCHE, VIRGINIE; CARDOSO, KATIA REGINA; ISHIKAWA, TOMAZ TOSHIMI; BOTTA, WALTER JOSE; JORGE, JR., ALBERTO MOREIRA. Hydrogen storage properties of 2 Mg-Fe mixtures processed by hot extrusion: Effect of ram speeds. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v. 44, n. 36, p. 20203-20212, . (18/09548-2, 14/21237-1)
DE LIMA ANDREANI, G. F.; MIGLIOLI, M. M.; TRIQUES, M. R. M.; ROCHE, V.; KIMINAMI, C. S.; BOTTA, W. J.; JORGE, JR., A. M.. Hydrogen storage properties of 2Mg-Fe mixtures processed by hot extrusion at different temperatures. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v. 42, n. 16, p. 11493-11500, . (13/05987-8, 14/21237-1)
DE LIMA ANDREANI, GISELE FERREIRA; MARTINS TRIQUES, MARIA REGINA; KIMINAMI, CLAUDIO SHYINTI; BOTTA, WALTER JOSE; ROCHE, VIRGINIE; JORGE, JR., ALBERTO MOREIRA. Characterization of hydrogen storage properties of Mg-Fe-CNT composites prepared by ball milling, hot-extrusion and severe plastic deformation. INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v. 41, n. 48, p. 23092-23098, . (13/05987-8, 12/13179-6, 14/21237-1)

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