Corresponding Author

Yan-xia CHEN(yachen@ustc.edu.cn)


The adsorption/oxidation of CO on the 55 nm Au@0.7 nm Pt nanoparticles electrode in both potentiodynamic and potentiostatic modes were investigated by surface enhanced Raman spectroscopy in a thin layer electrochemical flow cell under controlled mass transport, with the aim of clarifying the origin CO oxidation at lower electrode potentials (in current pre-wave region of corresponding cyclic voltammograms). Our results demonstrated that the CO oxidation kinetics differed significantly from the three kinds of different CO adsorption history, with almost no CO oxidation current in the pre-peak potential region after 0.35 VRHE CO adsorption with or without subsequent holding the potential at 0.06 VRHE for 30 min, compared to the significant CO oxidation current at lower potentials in both cyclic voltammograms and potentiostatic current transients after CO adsorption at 0.06 VRHE. In contrast, at the same reaction potential in the pre-wave region both during linear potential sweep and potential step experiments, differences in Raman spectra of saturated CO adlayer with CO adsorption potential of 0.06 VRHE and 0.35 VRHE were negligible. Possible origins for the effect of pre-adsorption potential on CO oxidation kinetics are discussed.

Graphical Abstract


CO oxidation, pre-peak, surface enhanced Raman spectroscopy

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