Characterization of Carbon-Supported AuPt Nanoparticles for Electrocatalytic Methanol Oxidation Reaction
- 14 February 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in Langmuir
- Vol. 22 (6), 2892-2898
- https://doi.org/10.1021/la0529557
Abstract
In view of the recent finding that the bimetallic AuPt nanoparticles prepared by molecular-capping-based colloidal synthesis and subsequent assembly on carbon black support and thermal activation treatment exhibit alloy properties, which is in sharp contrast to the bimetallic miscibility gap known for the bulk counterparts in a wide composition range, there is a clear need to assess the electrocatalytic properties of the catalysts prepared with different bimetallic composition and different thermal treatment temperatures. This paper reports recent results of such an investigation of the electrocatalytic methanol oxidation reaction (MOR) activities of the carbon-supported AuPt nanoparticle catalysts with different bimetallic composition and thermal treatment temperatures. AumPt100-m nanoparticles of 2−3 nm core sizes with different atomic compositions ranging from 10% to 90% Au (m = 10∼90) have been synthesized by controlling the feeding of the metal precursors used in the synthesis. The electrocatalytic MOR activities of the carbon-supported AuPt bimetallic catalysts were characterized in alkaline electrolytes. The catalysts with 65% to 85% Au and treated at 500 °C were found to exhibit maximum electrocatalytic activities in the alkaline electrolytes. The findings, together with a comparison with some well-documented catalysts as well as recent experimental and theoretical modeling results, have revealed important insights into the participation of COad and OHad on Au sites in the catalytic reaction of Pt in the AuPt alloys with ∼75% Au. The insights are useful for understanding the correlation of the bifunctional electrocatalytic activity of the bimetallic nanoparticle catalysts with the bimetallic composition and the thermal treatment temperatures.Keywords
This publication has 51 references indexed in Scilit:
- DFT Studies of Pt/Au Bimetallic Clusters and Their Interactions with the CO MoleculeThe Journal of Physical Chemistry B, 2005
- Phase Properties of Carbon-Supported Gold−Platinum Nanoparticles with Different Bimetallic CompositionsChemistry of Materials, 2005
- Platinum-Catalyzed Synthesis of Water-Soluble Gold−Platinum NanoparticlesLangmuir, 2005
- Controlled synthesis of platinum catalysts on Au nanoparticles and their electrocatalytic property for methanol oxidationApplied Catalysis A: General, 2004
- Methanol electrooxidation at Pt–Ru–W sputter deposited on Au substrateJournal of Power Sources, 2004
- The importance of the active states of surface atoms with regard to the electrocatalytic behaviour of metal electrodes in aqueous mediaElectrochimica Acta, 2000
- Size- and support-dependency in the catalysis of goldCatalysis Today, 1997
- Systematic Theoretical Study of Alloys of Platinum for Enhanced Methanol Fuel Cell PerformanceJournal of the Electrochemical Society, 1996
- Anodic oxidation of methanol at a gold-modified platinum electrocatalyst prepared by RF sputtering on a glassy carbon supportElectrochimica Acta, 1991
- Influence of ensemble size on CO chemisorption and catalytic n-hexane conversion by Au-Pt(111) bimetallic single-crystal surfacesJournal of Catalysis, 1983