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Development of new hydrogen storage material FeTi(Ni) for improved hydrogenation characteristics
Author(s) -
Singh Binod Kumar,
Ryu Hojin
Publication year - 2006
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.20006
Subject(s) - feti , hydrogen storage , enthalpy , induction furnace , materials science , hydrogen , vacuum induction melting , crucible (geodemography) , desorption , transition metal , alloy , tube furnace , metal , diffraction , metallurgy , analytical chemistry (journal) , thermodynamics , chemical engineering , chemistry , physics , biochemistry , domain decomposition methods , organic chemistry , adsorption , finite element method , chromatography , catalysis , computational chemistry , optics , engineering
The present study deals with the hydrogen storage characteristics of a transition metal composition Fe 0.5 Ni 0.5 Ti 1.3 synthesized by melting the metal powders in a previously outgassed graphite crucible using radio frequency (r.f.) induction furnace (12 kW) in an argon atmosphere. X‐ray diffraction (XRD) studies revealed that the as‐synthesized sample is multiphasic in nature and embodies FeTi, FeO and Ti phases. Microstructural features (SEM) signify the presence of secondary phases and cracks. The hydrogen storage capacity and kinetics determined at different temperatures were found to be 1.26 wt% at 350°C. Fe 0.5 Ni 0.5 Ti 1.3 exhibits faster hydrogen desorption kinetic (5 × 10 −4 m 3 s −1 kg −1 ), which is about two times higher than that of the parent FeTi 1.3 . Thermodynamic parameters Δ H (change in enthalpy) and Δ S (change in entropy) were found to be −35.07 kJmol −1 and 72.07 Jmol −1 K −1 respectively. © 2006 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.