Hydrogen Generation via Sodium Borohydride Hydrolysis Using the Graphene Supported Platinum-Ruthenium-Cobalt Catalysts Prepared nu Microwave-Assisted Synthesis
It has been determined that the PtRuCo/GR catalysts were synthesized with the Pt:Ru:Co molar ratios equal to 1:2:2, 1:1.7:5.6 and 3.5:1:23. The EDX spectra confirm the presence of Pt, Co and Ru nanoparticles in the investigated PtCoRu/GR catalysts.
It was found that the temperature and composition of catalysts have exceptional influence on the rate of hydrogen generation from alkaline sodium borohydride solutions. Significantly greater hydrogen generation rate is obtained at the synthesized PtRuCo/GR catalysts as compared with that at Co/GR. Highest rates of hydrogen generation were obtained at 60 oC and are 207.5, 82.8 and 53.1 L min-1 gMtotal-1 for the PtRuCo/GR catalysts with the Pt:Ru:Co molar ratios equal to 1:2:2, 1:1.7:5.6 and 3.5:1:23, respectively. The activation energy (Ea), determined from the kinetic data, is 45.6, 55.9 and 50.2 kJ mol-1 for PtRuCo/GR with the above mentioned Pt:Ru:Co molar ratios, indicating a high catalytic activity of the synthesized catalysts towards hydrolysis of sodium borohydride.