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Development of Hydrogen Absorbing Alloy with High Dissociation Pressure

Published online by Cambridge University Press:  15 February 2011

Yoshitsugu Kojima ,
Yasuaki Kawai ,
Shin-Ichi Towata ,
Tomoya Matsunaga ,
Tamio Shinozawa  and
Masahiko Kimbara
Yoshitsugu Kojima
Affiliation:
Toyota Central R&D Labs., Inc., Nagakute, Aichi, Japan ……
Yasuaki Kawai
Affiliation:
Toyota Central R&D Labs., Inc., Nagakute, Aichi, Japan ……
Shin-Ichi Towata
Affiliation:
Toyota Central R&D Labs., Inc., Nagakute, Aichi, Japan ……
Tomoya Matsunaga
Affiliation:
Material Engineering Div.3, Toyota Motor Corporation, Susono, Shizuoka, Japan
Tamio Shinozawa
Affiliation:
Material Engineering Div.3, Toyota Motor Corporation, Susono, Shizuoka, Japan
Masahiko Kimbara
Affiliation:
Corporate Technical Center, Toyota Industries Corporation, Obu, Aichi, Japan
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Abstract

The effective hydrogen capacity of TixCr2-yMny [≫X λ1.1 (1.08≤0x≤1.16), y λ1.0 (0.96≤y≤1.08)rsqb; exhibited the maximum value of 1.8 wt% in the pressure range of 33 MPa and 0.1 MPa at 296K (dissociation pressure: 5-11 MPa), and the alloy provided over 10% more capacity than conventional Ti-Cr-Mn (Ti1.2CrMn: 1.6 wt%, Ti1.2Cr1.9Mn0.1: 1.3 wt%). At the low temperature of 233 K, the alloy absorbed 2.0 wt% of hydrogen and the hydrogen desorption capacity at 0.1 MPa was 1.6 wt%. The dissociation pressure decreased with the Ti and the Mn contents and was explained by the function of the bulk modulus and the cell volume. According to the van't Hoff plots, the standard enthalpy differences (heat of formation) of the Ti1.16Cr0.92Mn1.08 and Ti1.08Cr1.04Mn0.96 hydrides were -21 and -22 kJ/molH2, respectively. These absolute values were about 10 kJ/molH2 smaller than those of LaNi5 and Ti-Cr-V. The alloy had sufficient hydriding and dehydriding kinetics. In the pressure range of 33 MPa and 0.1 MPa at 296 K, the alloy absorbed and desorbed 1.8 wt% of hydrogen in 60 sec and 300 sec, respectively. The hydrogen capacity changed gradually over many cycles and that after 1000 cycles was 94 % of the initial capacity. Thus Ti1.1CrMn can be utilized for a high- pressure MH tank which contains a hydrogen absorbing alloy with high dissociation pressure and compressed hydrogen.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 884: Symposium GG – Materials and Technology for Hydrogen Storage and Generation , 2005 , GG6.5.8
Copyright
Copyright © Materials Research Society 2005

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