Article

Formation of AgPt alloy nanoislands via chemical etching with tunable optical and catalytic properties.

National Center for Nanoscience and Technology, Beijing 100190, PR China.
Langmuir (impact factor: 4.19). 12/2009; 26(6):4443-8. DOI:10.1021/la9034968 pp.4443-8
Source: PubMed

ABSTRACT An effective way is developed to fabricate AgPt alloy nanoislands on gold nanorods based on the galvanic replacement between Ag and PtCl(4)(2-) in the presence of cetyltrimethylammonium bromide (CTAB). The optical and catalytic properties benefit from the porous structure composed of AgPt nanoislands. A large red shift (265 nm) after etching is observed for longitudinal surface plasmon resonance (SPR) in comparison with Au@Pt0.1@Ag. Alloy compositions in bulk miscibility gap can be obtained and finely tuned from Ag(0.56)Pt(0.44) to Ag(0.38)Pt(0.62). A unique composition dependence is found for both electrocatalytic oxidation of methanol and catalytic oxidation of o-phenylenediamine (OPD) by hydrogen peroxide. In both systems, the highest catalytic activity is achieved at the alloy composition of Pt(0.62)Ag(0.38). Proper alloying with Ag not only improves the CO poisoning of Pt catalyst but also enhances the catalytic activity greatly.

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    Article: Preparation of Pt Ag alloy nanoisland/graphene hybrid composites and its high stability and catalytic activity in methanol electro-oxidation.
    Lili Feng, Guo Gao, Peng Huang, Xiansong Wang, Chunlei Zhang, Jiali Zhang, Shouwu Guo, Daxiang Cui
    [show abstract] [hide abstract]
    ABSTRACT: ABSTRACT: In this article, PtAg alloy nanoislands/graphene hybrid composites were prepared based on the self-organization of Au@PtAg nanorods on graphene sheets. Graphite oxides (GO) were prepared and separated to individual sheets using Hummer's method. Graphene nano-sheets were prepared by chemical reduction with hydrazine. The prepared PtAg alloy nanomaterial and the hybrid composites with graphene were characterized by SEM, TEM, and zeta potential measurements. It is confirmed that the prepared Au@PtAg alloy nanorods/graphene hybrid composites own good catalytic function for methanol electro-oxidation by cyclic voltammograms measurements, and exhibited higher catalytic activity and more stability than pure Au@Pt nanorods and Au@AgPt alloy nanorods. In conclusion, the prepared PtAg alloy nanoislands/graphene hybrid composites own high stability and catalytic activity in methanol electro-oxidation, so that it is one kind of high-performance catalyst, and has great potential in applications such as methanol fuel cells in near future.
    Nanoscale Research Letters 01/2011; 6(1):551. · 2.73 Impact Factor
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Keywords

AgPt nanoislands
 
alloy composition
 
Au@Pt0.1@Ag. Alloy compositions
 
bulk miscibility gap
 
catalytic activity
 
catalytic oxidation
 
catalytic properties benefit
 
cetyltrimethylammonium bromide
 
effective way
 
electrocatalytic oxidation
 
fabricate AgPt alloy nanoislands
 
finely tuned
 
galvanic replacement
 
gold nanorods
 
highest catalytic activity
 
large red shift
 
longitudinal surface plasmon resonance
 
Pt catalyst
 
SPR
 
unique composition dependence