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Structural, microchemistry, and hydrogenation properties of TiMn0.4Fe0.2V0.4, TiMn0.1Fe0.2V0.7 and Ti0.4Zr0.6Mn0.4Fe0.2V0.4 metal hydrides

By E.D.. Koultoukis, S.S. Makridis, L. Röntzsch, E. Pavlidou, A. Ioannidou, E.S. Kikkinides and A.K. Stubos

Abstract

In this work, TiFe-based alloys have been developed according to the stoichiometry Ti(1-x)A(x)Fe(1-y)B(y) (A Zr; B Mn, V). The hydrogen solubility properties have been investigated to develop dynamic hydrides of Ti-based alloys for hydrogen storage applications. The hydrogenation behavior of these alloys has been studied, and their hydrogen storage capacities and kinetics have been evaluated. Several activation modes, including activation at high temperatures under hydrogen pressure, have been attempted for the as-milled powders. In order to clarify the structural/microstructural characteristics, and chemical composition before and after hydrogenation, X-Ray Diffraction (XRD), EDAX-Mapping Analysis and Scanning Electron Microscopy (SEM), have been carried out for the samples. Modeling of the isotherms has been performed by using MATLAB programming. The maximum gravimetric density of 4.3 wt%, has been obtained on the sample with the BCC main phase. The calculated enthalpy of reaction (Delta H) is found to be about 4 kJ/mol

Year: 2012
DOI identifier: 10.1166/jnn.2012.4901
OAI identifier: oai:fraunhofer.de:N-217063
Provided by: Fraunhofer-ePrints
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