We have discovered a new way of making graphene using specific catalyst stagger. The catalyst staging mechanism is believed to prevent the full adsorption of C free radicals, which forms tubular shape products. The specific catalyst stagger only allows partial adsorption of C and thus forms graphene sheets instead. The staging mechanism can also prevent individual sheets from sticking to each other. In the present report, the graphene and graphene hybrid composites were synthesized by the unoxidizing pyrolysis of salt-milled solid carbon sources, which are different from conventional process utilizing gas decomposition. The graphene products in the present report comprised 5 layers as confirmed with TEM, and other measurements such as FE-SEM, Raman spectroscopy and XRD. The measurement of bulk electrical resistivity shows that graphene hybrid composites prepared at certain MS/CS ratio (MS= metal source, CS=carbon source) exhibit 6.5 times more conductive than pure SWNT and 4.5 time more conductive than pure graphene nano platelets.The high electrical conductivity graphene nano composite successfully demonstrated the significant improvement of electro catalyst performance in the PEMFC using H2 and air.
Journal: TechConnect Briefs
Volume: 1, Nanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)
Published: June 18, 2012
Pages: 188 - 191
Industry sector: Advanced Materials & Manufacturing
Topicss: Carbon Nano Structures & Devices, Graphene & 2D-Materials