posted on 2013-02-21, 00:00authored byRikson Siburian, Takahiro Kondo, Junji Nakamura
Size controlled Pt catalysts supported by graphene nanosheets
(GNS)
are successfully prepared by changing the loading of Pt at 10–70
wt % using an impregnation method. It is found that Pt sub-nanoclusters
(0.8 nm) with an extremely large surface area (170 m2 g–1) are formed on the GNS support in a 10 wt % Pt/GNS
catalyst. An increase in loading of Pt leads to an increase in the
particle sizes of Pt, which results in lower activities for electro-oxidation
of adsorbed CO. A core level shift of Pt 4f in XPS indicates that
Pt is chemically interacted with graphene. The modification of catalytic
properties and the electronic structure is ascribed to the interface
interaction between Pt and graphene via π–d hybridization.