par McEwen, Jean-Sabin 
;Gaspard, Pierre ;De Decker, Yannick ;Barroo, Cédric ;Visart de Bocarmé, Thierry ;Kruse, Norbert
Référence Langmuir, 26, 21, page (16381–16391)
Publication Publié, 2010-08-06
;Gaspard, Pierre ;De Decker, Yannick ;Barroo, Cédric ;Visart de Bocarmé, Thierry ;Kruse, Norbert Référence Langmuir, 26, 21, page (16381–16391)
Publication Publié, 2010-08-06
Article révisé par les pairs
| Résumé : | The catalytic reduction of NO2 with hydrogen on a Pt field emitter tip is investigated using both field electron microscopy (FEM) and field ion microscopy (FIM). A rich variety of nonlinear behavior and unusually high catalytic activity around the {012} facets are observed. Our FEM investigations reveal that the correlation function exhibits damped oscillations with a decaying envelope, showing that molecular noise will influence the dynamics of the oscillations. The dependence of the oscillatory period on the PH2/PNO2 pressure ratios is analyzed. Similar patterns are reported under FIM conditions. Corresponding density functional theory (DFT) calculations for the adsorption of NO2 on Pt{012} in the presence of an external electric field are performed in order to gain an atomistic understanding of the underlying nonlinear phenomena. |
