title: High-Pressure Raman and Calorimetry Studies of Vanadium(III) Alkyl Hydrides for Kubas-Type Hydrogen Storage.
abstract: Reversible hydrogen storage under ambient conditions has been identified as a major bottleneck in enabling a future hydrogen economy. Herein, we report an amorphous vanadium(III) alkyl hydride gel that binds hydrogen through the Kubas interaction. The material possesses a gravimetric adsorption capacity of 5.42 wt % H2 at 120 bar and 298 K reversibly at saturation with no loss of capacity after ten cycles. This corresponds to a volumetric capacity of 75.4 kgH2  m(-3) . Raman experiments at 100 bar confirm that Kubas binding is involved in the adsorption mechanism. The material possesses an enthalpy of H2 adsorption of +0.52 kJ mol(-1) H2 , as measured directly by calorimetry, and this is practical for use in a vehicles without a complex heat management system.
authors.affiliation: Sustainable Environment Research Centre, University of South Wales, Pontypridd, CF37 4BD, United Kingdom.
authors.forename: Leah
authors.initials: L
authors.lastname: Morris
authors.affiliation: IREQ, Hydro Quebec, 1800 Boul. Lionel-Boulet, Varennes, Quebec, J3X 1S1, Canada.
authors.forename: Michel L
authors.initials: ML
authors.lastname: Trudeau
authors.affiliation: School of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom.
authors.forename: Daniel
authors.initials: D
authors.lastname: Reed
authors.affiliation: School of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom.
authors.forename: David
authors.initials: D
authors.lastname: Book
authors.affiliation: Sustainable Environment Research Centre, University of South Wales, Pontypridd, CF37 4BD, United Kingdom. david.antonelli@southwales.ac.uk.
authors.forename: David M
authors.identifier: http://orcid.org/0000-0002-9029-3788
authors.initials: DM
authors.lastname: Antonelli
keywords: Raman spectroscopy; hydrides; hydrogen storage; materials science; transition metals