Abstract
High-entropy alloys (HEAs) have shown desirable hydrogen storage performance owing to the lattice distortion effect and favorable phase structure. However, their pressure-composition-temperature (PCT) curves are usually lack of a well-defined hydrogen ab-/desorption plateau. Herein, we reported that by substituting 0.5 at.% Fe, Mn and Cr for the equivalent amount of V in the Ti1.0Zr1.0Fe1.0Mn1.0Cr1.0V1.0 (defined as V1.0 alloy) alloy, the plateau performance could be considerably improved. The non-equiatomic Ti1.0Zr1.0Fe1.5Mn1.0Cr1.0V0.5, Ti1.0Zr1.0Fe1.0Mn1.5Cr1.0V0.5 and Ti1.0Zr1.0Fe1.0Mn1.0Cr1.5V0.5 HEAs (defined as Fe1.5, Mn1.5 and Cr1.5 alloy, respectively) with a single C14 Laves phase rapidly absorb 1.82 wt%, 1.90 wt% and 1.89 wt% of hydrogen at 30 °C, respectively. Compare with the V1.0 alloy, the Fe1.5, Mn1.5 and Cr1.5 alloys show clearly visible hydrogen ab-/desorption plateau. Among all the alloys, the Fe1.5 alloy own the highest plateau pressure and hysteresis with values of 0.18/0.11 MPa and 0.41, followed by the Cr1.5 alloy with values of 0.17/0.05 MPa and 0.38, and the Mn1.5 alloy with values of 0.10/0.08 MPa and 0.28. Moreover, all the alloys exhibit good hydrogen ab-/desorption cycling performance, especially for the V1.0, Fe1.5 and Mn1.5 alloys, retaining 98, 99 and 97% reversible hydrogen storage capacity after 15 cycles, respectively.
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