Hydrogen Storage in Metal−Organic Frameworks by Bridged Hydrogen Spillover

TLDR

Hydrogen fuel‑cell vehicles are limited by the lack of viable storage, and although metal‑organic frameworks are promising, they have yet to achieve significant ambient‑temperature storage capacity. The study aims to increase hydrogen storage in modified MOFs by employing a simple spillover technique. The authors modified MOFs to induce hydrogen spillover, a simple technique that enhances storage. Modified IRMOF‑8 achieved 4 wt % hydrogen storage at 100 atm and room temperature with reversible, fast adsorption, demonstrating the promise of MOFs for hydrogen storage.

Abstract

The possible utilization of hydrogen as the energy source for fuel-cell vehicles is limited by the lack of a viable hydrogen storage system. Metal-organic frameworks (MOFs) belong to a new class of microporous materials that have recently been shown to be potential candidates for hydrogen storage; however, no significant hydrogen storage capacity has been achieved in MOFs at ambient temperature. Here we report substantially increased hydrogen storage capacities of modified MOFs by using a simple technique that causes and facilitates hydrogen spillover. Thus, the storage of 4 wt % is achieved at room temperature and 100 atm for the modified IRMOF-8. The adsorption is reversible, and the rates are fast. That has made MOFs truly promising for hydrogen storage application.