Despite the insight provided by the ab initio approach, there still remain some important questions concerning the hydrogen insertion in new hydrogen storage systems, Ti0.9V0.1C0.6 and Ti0.9Zr0.1C0.6. It is still largely unknown whether H is located in these materials, in octahedral and-or tetrahedral sites of the fcc structure or elsewhere. Secondly and more importantly for the future development of the hydrogen storage technology, ab initio calculation and electrochemistry results from Ti0.9V0.1C0.6 and Ti0.9Zr0.1C0.6 show that hydrogen storage is drastically increased in presence of Zr, but strongly decreased in presence of V. The main goal of the proposed experiment is to verify if zirconium attracts more hydrogen atoms around the Zr-C vacancy in Ti0.9Zr0.1C0.6Hx. This question will be addressed using perform mass-resolved neutron spectroscopy and simultaneous neutron diffraction