Polyacrylonitrile (PAN)-based polymer fiber prepared from electrospinning technique is carbonized and activated (with concentrated KOH solution) to obtain activated carbon nanofiber (ACNF). ACNF is used in this work as a host material for nanocofinement of LiBH4-LiAlH4 composite via solution impregnation. Successful nanoconfinement and homogeneous distribution of hydride composite on ACNF are confirmed by N-2 adsorption-desorption and SEM-EDS-mapping techniques, respectively. Nanoconfined LiBH4-LiAlH4 in ACNF performs almost single-step decomposition whereas that of milled sample is clearly two-step reaction. Onset dehydrogenation temperature of LiAlH4 from nanoconfined and milled samples is comparable at 100 degrees C, while that of LiBH4 obtained from nanoconfined sample is up to 80 degrees C lower than that of milled sample. In addition, significant reduction in main dehydrogenation temperature, especially of LiBH4 in nanoconfined LiBH4-LiAlH4 as compared with milled LiBH4-LiAlH4 (Delta T = up to 94 degrees C) and with pristine LiBH4 (AT = up to 149 degrees C) is achieved. Hydrogen contents released and reproduced in the 1st and 2nd dehydrogenations of nanoconfined LiBH4-LiAlH4 are 30 and 63% superior to those of milled sample. Reversibility of LiBH4, LiAlH4, and/or Li3AlH6 was accomplished from nanoconfined LiBH4-LiAlH4 under mild temperature and pressure condition (T = 320 degrees C and P(H-2) = 80 bar) as compared with other LiBH4-LiAlH4 (or Al) systems. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved,