Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (07): 1773-1778.doi: 10.3866/PKU.WHXB20100514

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Preparation of Core-Shell SiO2/Pt Particles via Layer-by-Layer Assembly and Their Electrooxidation and In-situ Electrochemical FTIR Spectra for CO

LI Yong-Jun, ZHOU You-Chen, SUN Shi-Gang   

  1. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005,Fujian Province, P. R. China
    State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
  • Received:2009-11-18 Revised:2010-01-30 Published:2010-07-02
  • Contact: LI Yong-Jun, SUN Shi-Gang E-mail:liyongjunef@gmail.com; sgsun@xmu.edu.cn

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Abstract:

Large-scale core-shell SiO2/Pt particles were synthesized via layer-by-layer assembly. The platinum shell was found to be about 26 nmthick and consisted of Pt nanoparticle aggregates. Cyclic voltammetry (CV) was employed to evaluate the electrocatalytic activity of the as-prepared core-shell SiO2/Pt particles for CO detection. Compared with the bulk Pt catalyst, the main oxidation potential was more negative at about 0.49 V (vs SCE). Moreover, COadsorption behavior was also examined using in-situ electrochemical Fourier transform infrared (FTIR) spectrum. Interestingly, the FTIR spectra showed inverted IR bands of linearly bonded CO and each IR band was split into two bands with an interval of ca 14 cm-1, which was difficult to discern at saturation coverage of CO on the Pt metal surface. Those anomalous phenomena can most probably be attributed to the structural effects of core-shell SiO2/Pt particles.

Key words: Platinum, Core-shell nanoparticle, Carbon monoxide, Electrooxidation, In-situ electrtochemical FTIR spectrum