Synthesis, electrochemical characterization and molecular dynamics studies of surface segregation of platinum nano-alloy electrocatalysts
- 5 April 2011
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Physical Chemistry Chemical Physics
- Vol. 13 (20), 9201-9208
- https://doi.org/10.1039/c0cp02384a
Abstract
Alloy Pt–M (M = Co, Ni) nanocatalysts, supported on carbon Vulcan XC-72, were synthesized using the carbonyl chemical route. A high dispersion on such substrate was revealed by transmission electron microscopy (TEM). Alloy formation on the nanometre scale length was shown by high-resolution transmission microscopy (HRTEM) and energy dispersive X-ray spectroscopy (EDX) on a nanoparticle. The metal M in Pt–M nanoalloys segregates preferentially on the nanoparticles' surface, as determined by the hydrogen adsorption electrochemical reaction. An increased tolerance towards methanol of such nanoalloy materials was observed for the oxygen reduction reaction (ORR) in acid media. To better understand the structure and segregation phenomena of these nanoalloys, molecular dynamics (MD) with a self-optimized reactive force field was applied.Keywords
This publication has 56 references indexed in Scilit:
- Tailoring of metal cluster-like materials for the molecular oxygen reduction reactionPure and Applied Chemistry, 2008
- Palladium-platinum powder catalysts manufactured by colloid synthesis: I. Preparation and characterizationJournal of Molecular Catalysis A: Chemical, 2005
- Synthesis, characterization and electrocatalytic behaviour of non-alloyed PtCr methanol tolerant nanoelectrocatalysts for the oxygen reduction reaction (ORR)Electrochimica Acta, 2005
- Synthesis and characterization of methanol tolerant Pt/TiOx/C nanocomposites for oxygen reduction in direct methanol fuel CellsElectrochimica Acta, 2004
- Surface effects of ordering in binary alloysJournal of Physics D: Applied Physics, 1997
- The third anodic hydrogen peak on platinum; Subsurface H2 adsorptionElectrochimica Acta, 1995
- CO chemisorption on the 61119 and 61009 oriented single crystal surfaces of the alloy CoPt3*1Journal of Catalysis, 1990
- Surface-sandwich segregation on nondilute bimetallic alloys: and probed by low-energy electron diffractionPhysical Review B, 1985
- Synthesis and chemical characterization of platinum carbonyl dianions [Pt3(CO)6]n2- (n = .apprx.10,6,5,4,3,2,1). A new series of inorganic oligomersJournal of the American Chemical Society, 1976
- Synthesis and structural characterization of platinum carbonyl cluster dianions bis,tris,tetrakis, or pentakis(tri-.mu.2-carbonyl-tricarbonyltriplatinum)(2-). New series of inorganic oligomersJournal of the American Chemical Society, 1974