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In‐Operando Neutron Diffraction Studies of Transition Metal Hydrogen Storage Materials

Hydrogen storage is one of the most important technological issues to be resolved in the move towards a future sustainable hydrogen-based economy. [ 1–3 ] The multiple technological requirements of safety, durability, recyclability, energy effi ciency, high hydrogen capacity and low cost place very signifi cant constraints on the development of a commercially viable hydrogen storage material for transportation. [ 4–6 ] Over the past decade, many new material systems have been studied as potential hydrogen storage materials. These include complex chemical hydrides such as alanates, amides and borohydrides, molecular hydrides such as ammonia borane and its derivatives and physisorbed systems such as carbon aerogels and metal organic framework materials. [ 7 ] Despite signifi cant advances, no materials have been discovered that have substantially improved overall performance over the current generation of transition metal hydrides. As a possible hydrogen storage system for fuel cell electric vehicles (FCEV), the new highpressure metal hydride (MH) tank system has been reported. [ 8 ]