A modified Chou model with parameters of temperature (T), initial hydrogen pressure (P₀), enthalpy change (ΔH) and entropy change (ΔS) is proposed in consideration of thermodynamic driving force. The meaningful activation energy E_v can be calculated for the negative temperature dependence of hydriding reaction in hydrogen storage materials. This model is verified by the hydriding/dehydriding experimental data of (LaNi₅)_1−xMg_x (x = 0, 0.018, 0.041, 0.063). The calculated results indicate that the hydriding kinetics of (LaNi₅)_1−xMg_x alloys are controlled by diffusion of hydrogen atom in hydride. The addition of small amount of magnesium improves the kinetic performance of LaNi₅ slightly. Furthermore, the modified Chou model was compared with the previous model that successfully explain the negative temperature depending hydrogenation reaction of Mg-based alloys. The fitting results show that the modified Chou model can describe the hydrogen absorption kinetic mechanism of negative temperature dependent materials more accurately.

考虑到热力学驱动力，提出了一种具有温度（T），初始氢压力（P ₀），焓变（ΔH）和熵变（ΔS）参数的改进的Chou模型。对于储氢材料中氢化反应的负温度依赖性，可以计算出有意义的活化能E _v。（LaNi ₅）_{1- x} Mg _x（x  = 0，0.018，0.041，0.063 ）的氢化/脱水实验数据验证了该模型。计算结果表明（LaNi ₅）₁₋的氢化动力学_x Mg _x合金通过氢原子在氢化物中的扩散来控制。少量镁的添加略微改善了LaNi ₅的动力学性能。此外，将修改后的Chou模型与以前的模型进行了比较，该模型成功地说明了基于Mg的合金的负温度依赖性加氢反应。拟合结果表明，改进的Chou模型可以更准确地描述负温度依赖性材料的氢吸收动力学机理。