Abstract
Large-scale core-shell SiO2/Pt particles were synthesized via layer-by-layer assembly.The platinum shell was found to be about 26 nm thick 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, CO adsorption 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.
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