FePt/reduced graphene oxide composites for high capacity hydrogen storage

ABSTRACT

Here, reduced graphene oxide (rGO) was modified with iron and platinum nanoparticles by solvothermal method. The structural order and textural properties of the graphene based materials were studied by BET, TEM, XRD, TGA and XPS techniques. Hydrogen storage properties of GO, platinum loaded reduced graphene oxide (Pt-rGO), iron loaded reduced graphene oxide (Fe-rGO), and iron platinum loaded reduced graphene oxide (FePt-rGO) have been investigated in the pressure range of 0.05 to atmospheric pressure and at 77 and 87 K. This gives hydrogen adsorption capacities of about 1.2, 2.1, 1.9, and 2.7 wt% at 77 K for GO, Pt-rGO, Fe-rGO, and FePt-rGO, respectively. The isosteric heat of adsorption (Q_st) was investigated as a function of hydrogen uptake at 77 and 87 K over the pressure range of 0.05 to atmospheric pressure. The isosteric heat of adsorption for FePt-rGO (9.2 kJ/mol) was found to be higher than the isosteric heat of adsorption for GO (6.1 kJ/mol) indicating a favorable interaction between hydrogen and surface of the reduced graphene oxide.

KEYWORDS:

• Hydrogen adsorption
• Reduced graphene oxide
• Spillover
• Platinum nanoparticle
• Iron nanoparticle

Acknowledgment

The authors thank The Research Council at the Azad University for financial support.