2018 - Sustainable Industrial Processing Summit & Exhibition
4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil
Seven Nobel Laureates have already confirmed their attendance: Prof. Dan Shechtman, Prof. Sir Fraser Stoddart, Prof. Andre Geim, Prof. Thomas Steitz, Prof. Ada Yonath, Prof. Kurt Wüthrich and Prof. Ferid Murad. More than 400 Abstracts Submitted from about 60 Countries.
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    Severe Plastic Deformation for Production of High-performance Hydrogen Storage Materials
    Zenji Horita1;
    1KYUSHU UNIVERSITY, Fukuoka, Japan;
    PAPER: 271/SISAM/Keynote (Oral)
    SCHEDULED: 15:55/Mon./Copacabana A (150/1st)



    ABSTRACT:
    High performance of hydrogen storage requires not only fast absorption/desorption kinetics but also lower operating temperature near ambient pressure. A process of severe plastic deformation through high-pressure torsion (HPT) was applied to two major hydrogen storage metallic materials such as Ti-based and Mg-based systems. Microstructures were well refined by the HPT process, so that nanograins were formed in the materials. For the Ti-based system, an HPT-processed TiFe intermetallic no longer requires pre-activation that limits practical use, as it involves exposure to hydrogen atmosphere under high pressures (>3 MPa) at high temperatures (~700 K). The lack of requirement for pre-activation is because hydrogen diffusion is enhanced through introduction of high densities of lattice defects such as grain boundaries [1]. Furthermore, the HPT-processed TiFe was not deactivated even after storage in air [2]. Application of the HPT process to Mg<sub>2</sub>Ni made its hydrogen storage performance improved so that hydrogen absorption is feasible at a reduced temperature of 423 K with faster hydrogen kinetics. This was due to the introduction of high densities of planar lattice defects such as grain boundaries and stacking faults [3].

    References:
    [1] K. Edalati, J. Matsuda, H. Iwaoka, S. Toh, E. Akiba, Z. Horita, Int. J. Hydrogen Energy 38 (2013) 4622-4627.
    [2] K. Edalati, J. Matsuda, M. Arita, T. Daio, E. Akiba, Z.Horita, Appl. Phys. Lett. 103 (2013) 143902.
    [3] T. Hongo, K. Edalati, M. Arita, J. Matsuda, E. Akiba, Z. Horita, Acta Mater. 92 (2015) 46-54.