ZrCo alloy is considered a promising hydrogen isotope storage material used in nuclear fusion reactors, but its large-scale promotion is inhibited by its poor cycling stability induced by disproportionation. To enhance the cycling stability of ZrCo-H systems, tuning lattice by Pd substitution for Co is performed in this work. The prepared ZrCo_0.6Pd_0.4 alloy mainly consists of the CrB-type orthorhombic phase (B33), sharing an identical lattice structure with its hydrided phase (ZrCoH₃); thus, stable homogeneous structural dehydrogenation/hydrogenation reaction is constructed for the first time with remarkably low lattice fluctuation and dehydrogenation activation energy, in favor of restraining disproportionation. Hence, a highest capacity of 1.45 wt% and optimum capacity retention of 96.67% after 50 dehydriding/hydriding cycles is achieved in ZrCo-H systems. Our work proposes the great potential of tuning lattice for improving the cycling performance in hydrogen isotope storage materials.

ZrCo合金被认为是用于核聚变反应堆的一种有前途的氢同位素存储材料，但由于歧化作用引起的循环稳定性差，因此无法大规模推广ZrCo合金。为了提高ZrCo-H系统的循环稳定性，在这项工作中执行了用Pd替代Co调整晶格的工作。制备的ZrCo _0.6 Pd _0.4合金主要由CrB型正交晶相（B33）组成，与它的氢化相具有相同的晶格结构（ZrCoH ₃）; 因此，首次构筑稳定的均相结构脱氢/氢化反应，具有极低的晶格波动和脱氢活化能，有利于抑制歧化。因此，在ZrCo-H系统中经过50个脱水/氢化循环后，可实现1.45 wt％的最高容量和96.67％的最佳容量保持率。我们的工作提出了调整晶格在提高氢同位素存储材料的循环性能方面的巨大潜力。