The development of hydrogen storage alloys possessing high plateau pressures for three-stage metal hydride hydrogen compressors (MHHCs), is critically significant for the safe and high-efficiency re-/charging of H₂ in hydrogen refueling stations (HRSs). Herein, Ti-Cr-Mn-Fe-based alloys (Ti_1.04+xCr_2−y-zMn_yFe_z, x = 0.02, 0.04, 0.06, y = 0.2, 0.3, 0.4, z = 0.5, 0.6, 0.7) synthesized by vacuum arc melting, with the single structure of C14 Laves and uniform element distribution, enable the final-stage compression units up to 85 MPa for MHHCs. It is demonstrated that both unit cell volume and maximum hydrogen capacity ($C_{\mathit{max}}$) increase by the rising amount of Ti or decreasing Mn and Fe in the Ti-Cr-Mn-Fe-based alloys, whereas the dissociation pressures and plateau hysteresis ($H_f$) at 223 K are reduced correspondingly, according to the orthogonal results. Meanwhile, as the over-stoichiometric amount of Ti increases, so does the plateau slope ($S_f$) of the Ti-Cr-Mn-Fe-based alloys. Under the optimized conditions conducted by the orthogonal results, Ti_1.08Cr_1.3Mn_0.2Fe_0.5 exhibits comprehensively considerable hydrogen absorption/desorption properties, rendering it possible to be one of the most promising final-stage compression materials. Notably, the dehydrogenation enthalpy and entropy for Ti_1.08Cr_1.3Mn_0.2Fe_0.5 is determined to be 22.3 ± 0.3 kJ/mol and 117.8 ± 1.0 J/(mol K), respectively, with a corresponding hydrogen absorption pressure of 14.00 ± 0.52 MPa at 298 K and a dehydriding pressure of 89.19 ± 3.21 MPa at 363 K. Furthermore, the values of $C_{\mathit{max}}$, $H_f,\mathrm{and}{S}_f$ are evaluated as 1.83 ± 0.01 wt%, 0.33 ± 0.01, and 0.72 ± 0.03, respectively, at 223 K.

开发用于三级金属氢化物氢气压缩机 (MHHC) 的具有高平台压力的储氢合金，对于加氢站 (HRS)中 H ₂的安全和高效再/充注至关重要。在此，Ti-Cr-Mn-Fe基合金（Ti _1.04+x Cr _2-yz Mn _y Fe _z , x = 0.02, 0.04, 0.06, y = 0.2, 0.3, 0.4, z = 0.5, 0.6, 0.7）由真空电弧熔炼合成，C14 Laves结构单一，元素分布均匀，使MHHC的末级压缩单元达到85 MPa。结果表明，单元电池体积和最大氢容量（$C_{\mathit{最大限度}}$）随着 Ti-Cr-Mn-Fe 基合金中 Ti 量的增加或 Mn 和 Fe 的减少而增加，而解离压力和平台滞后（$H_F$) 在 223 K 处相应减少，根据正交结果。同时，随着超化学计量的 Ti 增加，平台斜率也增加（${秒}_F$) 的 Ti-Cr-Mn-Fe 基合金。在正交结果优化的条件下，Ti _1.08 Cr _1.3 Mn _0.2 Fe _0.5综合表现出相当可观的吸氢/解吸氢性能，使其成为最有前途的末级压缩材料之一。值得注意的是，Ti _1.08 Cr _1.3 Mn _0.2 Fe _0.5的脱氢焓和熵_分别确定为 22.3 ± 0.3 kJ/mol 和 117.8 ± 1.0 J/(mol K)，相应的吸氢压力为 14.00 ± 0.5。在 298 K 和 89.19 ± 3.21 MPa 在 363 K 的脱水压力下。此外，值$C_{\mathit{最大限度}}$, $H_F,\mathrm{和}{秒}_F$ 在 223 K 下，分别评估为 1.83 ± 0.01 wt%、0.33 ± 0.01 和 0.72 ± 0.03。