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High-Pressure Raman and Calorimetry Studies of Vanadium(III) Alkyl Hydrides for Kubas-Type Hydrogen Storage

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<mark>Journal publication date</mark>16/03/2016
<mark>Journal</mark>ChemPhysChem
Issue number6
Volume17
Number of pages7
Pages (from-to)822-828
Publication statusPublished
Early online date20/01/16
Original languageEnglish

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.