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In this research, Mg85Cu5Ni10-x wt% TiF3 (x = 0, 2, 4, 6, 8) alloys were synthetized via ball milling and the catalytic mechanism of TiF3 on hydrogenation and dehydrogenation of Mg85Cu5Ni10 was studied. The microstructure, hydriding/dehydriding kinetics and thermodynamics of the alloys were discussed in detail. The TiF3 catalyzed alloys have faster hydriding/dehydriding kinetics and lower thermodynamic stability. After hydrogen absorption and desorption, TiF3 decomposes into TiH2 and MgF2. TiF3, TiH2 and MgF2 promote to forming crystal de