Probing electronic and vibrational properties at the electrochemical interface using SFG spectroscopy: Methanol electro-oxidation on Pt(110)

F. Vidal (1) , Bertrand Busson (2) , A. Tadjeddine (3)

1 LPPI - Laboratoire de Physico-chimie des Polymères et des Interfaces
2 LCPO - Laboratoire de Chimie Physique D'Orsay
3 LURE - Laboratoire pour l'utilisation du rayonnement électromagnétique

We report the study of methanol electro-oxidation on Pt(1 1 0) using infrared-visible sum-frequency generation (SFG) vibra-tional spectroscopy. The use of this technique enables to probe the vibrational and electronic properties of the interface simultaneously in situ. We have investigated the vibrational properties of the interface in the CO ads internal stretch spectral region (1700-2150 cm À1) over a wide range of potentials. The analysis of the evolution of the CO stretch line shape, which is related to the interference between the vibrational and electronic parts of the non-linear response, with the potential allows us to show that the onset of bulk methanol oxidation corresponds to the transition from a negatively to a positively charged surface.

Domaines: Chimie théorique et/ou physique; Chimie-Physique [physics.chem-ph]; Optique [physics.optics]

F. Vidal, Bertrand Busson, A. Tadjeddine. Probing electronic and vibrational properties at the electrochemical interface using SFG spectroscopy: Methanol electro-oxidation on Pt(110). Chemical Physics Letters, 2005, 403 (4-6), pp.324-328. ⟨10.1016/j.cplett.2005.01.026⟩. ⟨hal-02111127⟩