title: Synthesis and characterization of PtSn/carbon and Pt3Sn/carbon nanocomposites as methanol electrooxidation catalysts.
abstract: Two Pt-Sn/vulcan carbon nanocomposites containing nanoclusters of PtSn (niggliite) and Pt3Sn highly dispersed on a carbon powder support have been prepared using Pt(SnPh2Cl)(PPh3)2(Ph) or [Pt3[mu-(PPh2)2CH2]3(mu 3-SnF3) (mu 3-CO)][PF6] as single-source precursors of metal alloy. PtP2 or Pt metal is also present as a secondary phase. Bimetallic Pt-Sn nanoclusters with an average diameter of 5-8 nm are formed at a total metal loading of ca. 15 wt%. Evaluation of both Pt-Sn/C nanocomposites as electrooxidation catalysts in a direct methanol fuel cell gives fuel cell performances comparable to that expected for Pt-Sn catalysts prepared by more conventional methods.
authors.affiliation: Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, USA.
authors.forename: Frank E
authors.initials: FE
authors.lastname: Jones
authors.forename: Stephen B
authors.initials: SB
authors.lastname: Milne
authors.forename: Bogdan
authors.initials: B
authors.lastname: Gurau
authors.forename: Eugene S
authors.initials: ES
authors.lastname: Smotkin
authors.forename: Stuart R
authors.initials: SR
authors.lastname: Stock
authors.forename: C M
authors.initials: CM
authors.lastname: Lukehart
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D003460:Crystallization / Q000379:methods*; D011211:Electric Power Supplies; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods; D004566:Electrodes; D007854:Lead / Q000737:chemistry*; D008422:Materials Testing / Q000379:methods; D000432:Methanol / Q000737:chemistry*; D008863:Microspheres; D008968:Molecular Conformation; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods*; D010084:Oxidation-Reduction; D010316:Particle Size; D014001:Tin / Q000737:chemistry*
chemical_list: D007854:Lead; D014001:Tin; D002244:Carbon; D000432:Methanol