Fuel economy improvement by on board electrolytic hydrogen production

The hydrogen absorption, kinetics of hydrogen absorption and thermodynamics of dissolved hydrogen in C14 Laves phase alloy ZrMnFe0.7Co0.3 are studied in the ranges 1≤P (bar)≤30 and 303≤T (K)≤473. Substituting Co at Fe site in ZrMnFe leads to the contraction of the lattice and subsequently increases the plateau pressure with a reduction in hydrogen intake capacity. The relative partial molar enthalpy and entropy of dissolved hydrogen in ZrMnFe0.7Co0.3–H are found to be in the ranges −(6–11) kJ (mol H)−1 and −(20–42) J K−1 (mol H)−1, respectively. The presence of α, (α+β) and β phases as seen in the P-C isotherms, is further confirmed by thermodynamic studies and kinetics of hydrogen absorption.