Catalyst doping is a critical approach to improve the kinetics of MgH₂. However, reported activation energy ($E_a$) values of catalyzed MgH₂ systems show a large discrepancy. This study investigates the effect of the driving force on $E_a$ for (de)hydrogenation reactions. The kinetic rate constant is calculated using Johnson-Mehl-Avrami-Kolomogorov (JMAK) model. $E_a$ is obtained according to a series of kinetic measurements under a nearly constant driving force. Under a low driving force $\left(P_{In}/P_{eq}=1.5\right)$, the $E_a$ for dehydrogenation and hydrogenation are calculated to be 102.3$\pm$5.0 and 41.6$\pm$7.5 kJ/mol H₂, respectively. Under a high driving force $\left(P_{In}/P_{eq}=10\right)$, the $E_a$ for dehydrogenation and hydrogenation are calculated to be 101.4$\pm$25.8 and 57.4$\pm$5.0 kJ/mol H₂, respectively. The result shows that the high driving force leads to higher hydrogenation $E_a$ over the $E_a$ obtained the low driving force, while dehydrogenation $E_a$ remains unchanged under different driving forces.

催化剂掺杂是改善 MgH ₂动力学的关键方法。然而，报道的活化能（${乙}_{\mathrm{一种}}$) 催化 MgH ₂系统的值显示出很大的差异。本研究探讨了驱动力对${乙}_{\mathrm{一种}}$用于（脱）氢化反应。使用 Johnson-Mehl-Avrami-Kolomogorov (JMAK) 模型计算动力学速率常数。${乙}_{\mathrm{一种}}$在几乎恒定的驱动力下根据一系列动力学测量获得。在低驱动力下$\left({磷}_{\mathrm{一世}n}/{磷}_{\mathrm{电子}q}=1.5\right)$， 这 ${乙}_{\mathrm{一种}}$ 脱氢加氢计算为102.3$\pm$5.0 和 41.6$\pm$分别为 7.5 kJ/mol H ₂。在高驱动力下$\left({磷}_{\mathrm{一世}n}/{磷}_{\mathrm{电子}q}=10\right)$， 这 ${乙}_{\mathrm{一种}}$ 脱氢加氢计算为101.4$\pm$25.8 和 57.4$\pm$分别为5.0 kJ/mol H ₂。结果表明，高驱动力导致更高的氢化${乙}_{\mathrm{一种}}$ 在 ${乙}_{\mathrm{一种}}$ 获得低驱动力，同时脱氢 ${乙}_{\mathrm{一种}}$ 在不同的驱动力下保持不变。