A 3NaBH(4)/YF3 hydrogen storage composite was prepared through ball milling and its hydrogen sorption properties were investigated. It is shown that NaBH4 does not react with YF3 during ball milling. The dehydrogenation of the composite starts at 423 degrees C, which is about 100 degrees C lower than the dehydrogenation temperature of pure NaBH4, with a mass loss of 4.12 wt%. Pressure Composition Temperature tests reveal that the composite has reversible hydrogen sorption performance in the temperature range from 350 degrees C to 413 degrees C and under quite low hydrogenation plateau pressures (<1 MPa). Its maximum hydrogen storage capacity can reach up to 3.52 wt%. The dehydrogenated composite can absorb 3.2 wt% of hydrogen within 5 mm at 400 degrees C. Based on the Pressure Composition Temperature analyses, the hydrogenation enthalpy of the composite is determined to be -46.05 kJ/mol H-2, while the dehydrogenation enthalpy is 176.76 kJ/mol H-2. The mechanism of reversible hydrogen sorption in the composite involves the decomposition and regeneration of NaBH4 through the reaction with YF3. Therefore, the addition of the YF3 to NaBH4 as a reagent forms a reversible hydrogen storage composite. Copyright (C) 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.