Atoms and Nanoparticles of Transition Metals as Catalysts for Hydrogen Desorption from Magnesium Hydride

Table 1

Evaluated values of the half-reaction time (𝜏_1/2) at T = 623 K, order of reaction (n), and activation energy (E_a) of MgH₂ samples with different Nb concentrations.

Sample	𝜏1/2 (s)	n	Ea(kJ mol^-1 H)
Pure Mg	3250 ± 50	4	141±5
Mg + 0.06 at.% Nb	2390 ± 30	2	140 ± 5
Mg + 1 at.% Nb	290 ± 10	1.5	78 ± 5
Mg + 2÷5 at.% Nb	110 ± 10	1	51 ± 5