TY - JOUR

T1 - High-pressure adsorptive storage in hydrogen in MIL-101 (Cr) and AX-21 for mobile applications

T2 - cryocharging and cryokinetics

AU - Bimbo, Nuno

AU - Xu, Wesley

AU - Sharpe, Jessica E.

AU - Ting, Valeska P.

AU - Mays, Timothy J.

N1 - This is the author’s version of a work that was accepted for publication in Materials and Design. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Materials and Design, 89, 2016 DOI: 10.1016/j.matdes.2015.10.069

PY - 2016/1/5

Y1 - 2016/1/5

N2 - Current state-of-the-art methods consist of containing highpressure compressed hydrogen in composite cylinders, with solid-state hydrogen storage materials an alternative that could improve on storage performance by enhancing volumetric densities. A new strategy that uses cryogenic temperatures to load hydrogen (cryocharging) is proposed and analysed in this work, comparing densities and final storage pressures for empty cylinders and containers with the high-surface area materials MIL-101 (Cr) and AX-21. Results show cryocharging as a viable option, as it can substantially lower the charging (at 77 K) and final pressures (at 298 K) for the majority of the cases considered. Kinetics are an equally important requirement for hydrogen storage systems, so the effective diffusivities at these conditions for both materials were calculated, and showed values comparable to the ones estimated in metal-organic frameworks and zeolites from quasielastic neutron scattering and molecular simulations. High-surface area materials tailored for hydrogen storage are a promising route for storage in mobile applications and results show that cryocharging is a promising strategy for hydrogen storage systems, since it increases volumetric densities and avoids energy penalties of operating at high pressures and/or low temperatures.

AB - Current state-of-the-art methods consist of containing highpressure compressed hydrogen in composite cylinders, with solid-state hydrogen storage materials an alternative that could improve on storage performance by enhancing volumetric densities. A new strategy that uses cryogenic temperatures to load hydrogen (cryocharging) is proposed and analysed in this work, comparing densities and final storage pressures for empty cylinders and containers with the high-surface area materials MIL-101 (Cr) and AX-21. Results show cryocharging as a viable option, as it can substantially lower the charging (at 77 K) and final pressures (at 298 K) for the majority of the cases considered. Kinetics are an equally important requirement for hydrogen storage systems, so the effective diffusivities at these conditions for both materials were calculated, and showed values comparable to the ones estimated in metal-organic frameworks and zeolites from quasielastic neutron scattering and molecular simulations. High-surface area materials tailored for hydrogen storage are a promising route for storage in mobile applications and results show that cryocharging is a promising strategy for hydrogen storage systems, since it increases volumetric densities and avoids energy penalties of operating at high pressures and/or low temperatures.

KW - hydrogen storage

KW - porous materials

KW - adsorption of hydrogen

KW - adsorption kinetics

U2 - 10.1016/j.matdes.2015.10.069

DO - 10.1016/j.matdes.2015.10.069

M3 - Journal article

VL - 89

SP - 1086

EP - 1094

JO - Materials and Design

JF - Materials and Design

SN - 0261-3069

ER -