Significantly Enhanced Hydrogen Storage in Metal−Organic Frameworks via Spillover

TLDR

Hydrogen storage for fuel‑cell vehicles is limited by the lack of safe, effective systems, and no current technology meets DOE targets, though porous metal‑organic frameworks (MOFs) are promising candidates yet have not achieved significant ambient‑temperature storage. The study aims to demonstrate significant hydrogen storage in MOF‑5 and IRMOF‑8 at ambient temperature using a simple hydrogen dissociation and spillover technique. The authors apply a hydrogen dissociation and spillover method to MOF‑5 and IRMOF‑8 to achieve this storage. Hydrogen uptakes in MOF‑5 and IRMOF‑8 increased by factors of 3.3 and 3.1, reaching nearly 2 wt % at 10 MPa and 298 K, with fully reversible isotherms, indicating suitability for various MOF materials.

Abstract

The utilization of hydrogen in fuel-cell powered vehicles is limited by the lack of a safe and effective system for hydrogen storage. At the present time, there is no viable storage technology capable of meeting the DOE targets. Porous metal-organic frameworks (MOFs) are novel and potential candidates for hydrogen storage. Until now it is still not possible to achieve any significant hydrogen storage capacity in MOFs at ambient temperature. Here, we report, for the first time, significant amounts of hydrogen storage in MOF-5 and IRMOF-8 at ambient temperature by using a very simple technique via hydrogen dissociation and spillover. Thus, hydrogen uptakes for MOF-5 and IRMOF-8 can be enhanced by a factor of 3.3 and 3.1, respectively (to nearly 2 wt % at 10 MPa and 298 K). Furthermore, the isotherms are totally reversible. These findings suggest that our technique is suitable for hydrogen storage in a variety of MOF materials because of their similar structures as MOF-5 and IRMOF-8.