In this paper, La is partial substituted for Ti to improving the hydrogen storage performance of TiFe alloy. The Ti_1-xLa_xFe_0.8Mn_0.2 (x = 0, 0.01, 0.03, 0.06, 0.09) alloys were prepared by induction melting under vacuum. The influences of La on the microstructure, gaseous hydrogen absorption and thermodynamics were investigated. It was found from the X-ray diffraction results that all the alloys contained the single TiFe phase, the substitution of La does not change the phase composition of the alloys. The lattice parameters decreased with La substitution. And TiFeH and TiFeH₂ hydride were detected after hydrogenation process. The hydrogen absorption kinetic property of Ti_1-xLa_xFe_0.8Mn_0.2 (x = 0, 0.01, 0.03, 0.06, 0.09) alloys is improved by La substitution. The maximum hydrogen storage capacity of Ti_1-xLa_xFe_0.8Mn_0.2 (x = 0, 0.01, 0.03, 0.06, 0.09) alloys is 1.621, 1.633, 1.54, 1.532, 1.328 wt%, respectively at 3 MPa 323 K after activation. La substitution has significant effect on the P–C-T curves of the alloys, the plateaus pressure of TiFe to TiFeH heightened by La substitution increasing. Furthermore, the enthalpy and entropy changes of the hydrogenation/dehydrogenation at different temperatures were also calculated by Van't Hoff equation. The hydrogenation enthalpy ΔH_ab were −30.1, −31.7, −27.0, −27.7 and −27.4 kJ/mol H₂, respectively.

在本文中，La 部分替代了 Ti 以提高 TiFe 合金的储氢性能。Ti _{1- x} La _x Fe _0.8 Mn _0.2 ( x  = 0, 0.01, 0.03, 0.06, 0.09)合金是通过真空感应熔炼制备的。研究了La对微观结构、气态吸氢和热力学的影响。X射线衍射结果发现，所有合金均含有单一的TiFe相，La的取代不改变合金的相组成。晶格参数随着 La 取代而降低。和 TiFeH 和 TiFeH ₂氢化后检测到氢化物。 通过La置换，Ti _{1- x} La _x Fe _0.8 Mn _0.2 ( x = 0, 0.01, 0.03, 0.06, 0.09)合金的吸氢动力学性能得到改善。Ti _{1- x} La _x Fe _0.8 Mn _0.2 ( x = 0, 0.01, 0.03, 0.06, 0.09) 合金在活化后在 3 MPa 323 K 下分别为 1.621、1.633、1.54、1.532、1.328 wt%。La取代对合金的P-CT曲线有显着影响，随着La取代的增加，TiFe对TiFeH的平台压力升高。此外，还通过Van't Hoff方程计算了不同温度下加氢/脱氢的焓变和熵变。氢化焓Δ H _ab分别为-30.1、-31.7、-27.0、-27.7和-27.4 kJ/mol H ₂。