Reduced graphene oxide doped with Ni/Pd nanoparticles for hydrogen storage application

Graphene was prepared using modified Hummer method. The hydrogen storage capacity (HSC) and the kinetics of hydrogen up take of the graphene were investigated after doping with 5 and 10 wt% Pd or Ni nanoparticles. Pd has a catalytic effect on hydrogen uptake at 80 K and 300 K. The mechanism of HSC was studied. Nickel displayed a negative hydrogen uptake at 300 K. The influence of the degree of oxidation of graphite on the hydrogen uptake of the graphene was studied. Both mild and intensive over oxidation have affected the quality of the graphene produced and consequently reduced its hydrogen uptake.