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Platinum nanoparticles have been reported with mean sizes between 1.5 and 7 nm supported on carbon. The contact between Pt nanoparticles and C has never been controlled and monitored nanoscopically. In this paper, stable Pt nanoparticles with a mean size of 1.2 nm were synthesized embedded on/in a C matrix catalytically produced from acetylene over the Pt nanoparticles. The replica Pt−C composite was synthesized inside of the ordered mesopores (2.7 nm) of Al-MCM-41 followed by removal of the template. The contact between the Pt nanoparticle and C was experimentally observed by high-energy resolution Pt L2-edge XANES spectra tuned to 11065.7 eV, at a lower energy by 5 eV than the Pt Lβ1 peak top for the replica Pt−C pressed to electrolyte polymer (Nafion). The spectra were nicely reproduced in a theoretical spectrum using ab initio multiple scattering calculations for the interface Pt site between cuboctahedral Pt38 and graphite layers. Other Pt sites detected in state-selective Pt L2-edge XANES were exclu...

Synthesis and Site Structure of a Replica Platinum−Carbon Composite Formed Utilizing Ordered Mesopores of Aluminum-MCM-41 for Catalysis in Fuel Cells