"Peroxide -like intermediate observed at hydrogen rich condition on Pt(111) after interaction with oxygen"

Janay B. MacNaughton: Lars-Åke Näslund , Toyli Anniyev , Hirohito Ogasawara and Anders Nilsson; Physical Chemistry Chemical Physics, 04/12/10.

Additional Authors: Lars-Åke Näslund , Toyli Anniyev , Hirohito Ogasawara and Anders Nilsson

Abstract:

Hydrogen peroxide has been found to form as a byproduct during fuel cell operation, which is linked to the degradation of the ion exchange membrane resulting in a shorter lifetime of the fuel cell . Using O 1s X-ray photoelectron spectroscopy and X-ray absorption spectroscopy we investigated the molecular oxygen adsorption on hydrogenated Pt(111) and found that adsorbed hydrogen promotes the formation of a hydrogen peroxide-like intermediate. Polarization dependent X-ray absorption spectroscopy reveals that the O–O molecular axis is close to parallel and the OH group is perpendicular to the surface.