3. Use of materials according to application

3.1 Hydride processing

The use of hydrides requires the mastery of two particularly constraining phenomena. The reaction is exothermic in the direction of hydrogen absorption, and endothermic in the opposite direction. The amount of heat energy generated during the reaction, directly proportional to the enthalpy of reaction, is not negligible: for a hydride of the TiFe type (reversible capacity of 1.5% by mass, ΔH = – 28.1 kJ/mol), for example, it corresponds to 12% of the energy contained in...