Experimental and theoretical study of hydrogen electrochemical discharging by MmNi_3.6Co_0.6Al_0.8 alloy

The electrochemical discharge isotherms of the MmNi_3.6Co_0.6Al_0.8 alloy are evaluated by way of a numerical adjustment model premised on analytical equations within the framework of statistical physics. The outcomes derived from this model exhibit favorable concordance with the experimental data. Three distinct temperatures (T = 313.15 K, T = 333.15 K, and T = 343.15 K) are employed to adapt experimental electrochemical discharge isotherms. The numerical fitting of the experimental results allows for the extraction of the physico-chemical parameters of the mathematical equations of the model. The relationship between model parameters and experimental data on electrochemical discharge isotherms is established. These parameters include the number of charged atoms per site (n₁; n₂), the density of the receptor site (N_1m; N_2m), and the parameters related to energy (P₁; P₂). Subsequently, these latters are examined under the effect of temperature variation. This numerical model are used to derive the distinct thermodynamic functions that control the electrochemical discharge mechanism of hydrogen by the MmNi_3.6Co_0.6Al_0.8 alloy, including entropy (S_a), Gibbs enthalpy (G), and internal energy (E_int).