Lithium-doped silica rich MIL-101(Cr) for enhanced hydrogen uptake.

Abstract

Metal organic frameworks (MOFs) show promising characteristics for hydrogen storage application. In this direction, modification of under-utilized large pore cavities of MOFs has been extensively explored as a promising strategy to further enhance the hydrogen storage properties of MOFs. Here, we described a simple methodology to enhance the hydrogen uptake properties of RHA incorporated MIL-101 (RHA-MIL-101, where RHA is rice husk ash - a waste material) by controlled doping of Li+ ions. Hydrogen gas uptake of Li-doped RHA-MIL-101 is significantly higher (up to 72%) compared to the undoped RHA-MIL-101, where the content of Li+ ions doping greatly influenced the hydrogen uptake properties. We attributed the observed enhancement in hydrogen gas uptake of Li-doped RHA-MIL-101 to the favorable Li+ ion to H2 interactions and the co-operative effect of silanol bonds of silica-rich rice-husk ash incorporated in MIL-101.