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Acta Metall Sin  2004, Vol. 40 Issue (5): 527-530     DOI:
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Effect of Cr Content on the Sorption Performance of TiMn1.2-xCrxV0.25Fe0.05 Alloys
YU Xuebin; CHEN Jinzhou; WU Zhu; XIA Baojia
Shanghai Institute of Microsystem and Information Technology; The Chinese Academy of Sciences; Shanghai 200050
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YU Xuebin; CHEN Jinzhou; WU Zhu; XIA Baojia. Effect of Cr Content on the Sorption Performance of TiMn1.2-xCrxV0.25Fe0.05 Alloys. Acta Metall Sin, 2004, 40(5): 527-530 .

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Abstract  The hydrogen absorption-desorption characteristics of TiMn1.2-xCrxV0.25Fe0.05(x=0.0, 0.1, 0.2, 0.3, 0.4) alloys as a hydrogen storage tank were investigated. XRD results show that the lattice constants and the unit cell volume increase with increasing Cr content. The PCT results exhibit that the hydrogen sorption plateau pressure and hysteresis decrease with increasing Cr content. The change in the full width half maximum (FWHM) and c/a ratio with the change in the degree of slope present the same trend with Cr concentration, which implies that the slope behaviors in TiMn1.2-xCrxV0.25Fe0.05 system are closely correlated with the strain energy of interstitial site. In all cases, the TiMn1.0Cr0.2V0.25Fe0.05 alloy exhibits a larger hydrogen capacity, lower plateau pressure, and smaller hysteresis and slope properties, which can satisfy the demand of hydrogen storage tanks for proton exchange membrane fuel cell.
Key words:  alloy      hydrogen storage capacity           
Received:  08 May 2003     
ZTFLH:  TG139.7  
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YU Xuebin
CHEN Jinzhou
WU Zhu
XIA Baojia

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