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Heterogeneous Au-Pt nanostructures with enhanced catalytic activity toward oxygen reduction.
- Source :
-
Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2012 Mar 14; Vol. 41 (10), pp. 2898-903. Date of Electronic Publication: 2012 Jan 20. - Publication Year :
- 2012
-
Abstract
- Heterogeneous Au-Pt nanostructures have been synthesized using a sacrificial template-based approach. Typically, monodispersed Au nanoparticles are prepared first, followed by Ag coating to form core-shell Au-Ag nanoparticles. Next, the galvanic replacement reaction between Ag shells and an aqueous H(2)PtCl(6) solution, whose chemical reaction can be described as 4Ag + PtCl(6)(2-)→ Pt + 4AgCl + 2Cl(-), is carried out at room temperature. Pure Ag shell is transformed into a shell made of Ag/Pt alloy by galvanic replacement. The AgCl formed simultaneously roughens the surface of alloy Ag-Pt shells, which can be manipulated to create a porous Pt surface for oxygen reduction reaction. Finally, Ag and AgCl are removed from core-shell Au-Ag/Pt nanoparticles using bis(p-sulfonatophenyl)phenylphosphane dihydrate dipotassium salt to produce heterogeneous Au-Pt nanostructures. The heterogeneous Au-Pt nanostructures have displayed superior catalytic activity towards oxygen reduction in direct methanol fuel cells because of the electronic coupling effect between the inner-placed Au core and the Pt shell.
Details
- Language :
- English
- ISSN :
- 1477-9234
- Volume :
- 41
- Issue :
- 10
- Database :
- MEDLINE
- Journal :
- Dalton transactions (Cambridge, England : 2003)
- Publication Type :
- Academic Journal
- Accession number :
- 22261896
- Full Text :
- https://doi.org/10.1039/c2dt11960a