Hydrogen sorption kinetics, hydrogen permeability, and thermal properties of compacted 2LiBH 4 eMgH 2 doped with activated carbon nanofibers Sophida Thiangviriya a , Chongsutthamani Sitthiwet a , Praphatsorn Plerdsranoy a , Giovanni Capurso b , Claudio Pistidda b , Oliver Utke c , Martin Dornheim b , Thomas Klassen b , Rapee Utke a,d,* a School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand b Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Planck-Strasse 1, D-21502, Geesthacht, Germany c Mechanical System Division, Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, 30000, Thailand d Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization, School of Chemistry, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand article info Article history: Received 13 December 2018 Received in revised form 30 March 2019 Accepted 15 April 2019 Available online xxx Keywords: Metal hydrides Carbon Hydrogen storage Dehydrogenation Reversibility abstract To improve the packing efficiency in tank scale, hydrides have been compacted into pellet form; however, poor hydrogen permeability through the pellets results in sluggish kinetics. In this work, the hydrogen sorption properties of compacted 2LiBH 4 eMgH 2 doped with 30 wt % activated carbon nanofibers (ACNF) are investigated. After doping with ACNF, onset dehydrogenation temperature of compacted 2LiBH 4 eMgH 2 decreases from 350 to 300  C and hydrogen released content enhances from 55 to 87% of the theoretical capacity. The sample containing ACNF releases hydrogen following a two-step mechanism with reversible hydrogen storage capacities up to 4.5 wt % H 2 and 41.8 gH 2 /L, whereas the sample without ACNF shows a single-step decomposition mainly from MgH 2 with only 1.8 wt % H 2 and 15.4 gH 2 /L. Significant kinetic improvement observed in the doped system is due to the enhancement of both hydrogen permeability and heat transfer through the pellet. © 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. * Corresponding author. School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand. E-mail address: rapee.g@sut.ac.th (R. Utke). Available online at www.sciencedirect.com ScienceDirect journal homepage: www.elsevier.com/locate/he international journal of hydrogen energy xxx (xxxx) xxx https://doi.org/10.1016/j.ijhydene.2019.04.146 0360-3199/© 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. Please cite this article as: Thiangviriya S et al., Hydrogen sorption kinetics, hydrogen permeability, and thermal properties of compacted 2LiBH 4 eMgH 2 doped with activated carbon nanofibers, International Journal of Hydrogen Energy, https://doi.org/10.1016/ j.ijhydene.2019.04.146