Effect of Cr Content on the Sorption Performance of TiMn1.2-xCrxV0.25Fe0.05 Alloys
Cr含量对TiMn1.2-xCrxV0.25Fe0.05合金吸/放氢性能的影响

The hydrogen absorption-desorption characteristics of TiMn_(1.2-x)Cr_xV_(0.25)Fe_(0.05)(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 TiMn_(1.2-x)Cr_xV_(0.25)Fe_(0.05) system are closely correlated with the strain energy of interstitial site. In all cases, the TiMn_(1.0)Cr_(0.2)V_(0.25)Fe_(0.05) 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 exchance membrane fuel cell.