Hydrogenation behaviour of La0.5R0.5Ni4.8Al0.1Li0.1 (R = La, Ce, Pr or Nd) alloys

In the present work, we have investigated the hydrogenation properties of La0.5R0.5Ni4.8Al0.1Li0.1 (R = Ce, Pr or Nd) alloys under the hydrogen pressure ranging from 0.02 to 5 MPa. The pressure–composition (p–c) isotherms have been measured at four temperatures (293, 313, 333 and 353 K) in order to evaluate hydrogen absorption/desorption abilities of the alloys. For the investigated systems, the enthalpy and entropy of the dehydrogenation process have been calculated using vanʹt Hoff plots.