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Citation: TANG Xue-Hong, WU Ying, ZHANg Yu, ZHAO Yan-Rong, ZHONG Nian. Preparation of Au Core/Ag Shell Nanoparticles by Photocatalysis Reduction Method and Electrocatalysis of Its Modified Electrode[J]. Chinese Journal of Applied Chemistry, ;2009, 26(4): 471-474. shu

Preparation of Au Core/Ag Shell Nanoparticles by Photocatalysis Reduction Method and Electrocatalysis of Its Modified Electrode

TANG Xue-Hong ^a,b ,
WU Ying ^a,, ,
ZHANg Yu ^a ,
ZHAO Yan-Rong ^a ,
ZHONG Nian ^a

1.
a College of Chemistry and Chemical Engineering, Suzhou University, Suzhou 215123;
2.
b Department of Environment Engineering, Xuzhou Institute of Industrial Technology, Xuzhou

Corresponding author: WU Ying,
Received Date: 7 April 2008
Available Online: 27 June 2008
Fund Project: 江苏省教育厅基金资助项目(07KJB150100) (07KJB150100)

A novel and facile photoreduction technique to synthesize Au core/Ag shell nanoparticles has been proposed with Keggin structure polyoxotungstosilicate H₄SiW₁₂O₄₀(short for SiW₁₂) as a reducing reagent,photocatalyst,and stabilizer.The nanoparticles capped with Keggin ions could obviate the possibility of nucleation of fresh Ag nanoparticles in solution.The resulted Au core/Ag shell(SiW₁₂-(Au/Ag) nanoparticles) were of polydisperse and spheric morphology with size ranged from 30 to 40 nm.Through the electrostatic attraction of the PVP polymer film on the glassy carbon electrode surface,a SiW₁₂-(Au/Ag) nanoparticles multilayer films modified electrode(SiW₁₂-(Au/Ag)-PVP/GCE) was obtained.The results show that three pairs of reversible redox peaks of SiW₁₂ at the modified electrode have been obtained by cyclic voltammetry in a 0.5 mol/L H₂SO₄ solution,with good sensitivity and excellent stability.The electrocatalysis of H₂O₂ at SiW₁₂-(Au/Ag)-PVP/GCE shows a higher activity than that of it at SiW₁₂-Ag-PVP/GCE.It suggests that the interaction between Au core and Ag shell could enhance the electrocatalysis of SiW₁₂-modified electrode.
- photoreduction,
- polyoxotungstosilicate,
- core/shell nanoparticle,
- modified electrode,
- electrocatalysis
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