par Grosfils, Patrick 
;Gaspard, Pierre ;Visart de Bocarmé, Thierry
Référence The Journal of Chemical Physics, 143, 6, 064705
Publication Publié, 2015-08
;Gaspard, Pierre ;Visart de Bocarmé, Thierry Référence The Journal of Chemical Physics, 143, 6, 064705
Publication Publié, 2015-08
Article révisé par les pairs
| Résumé : | A combined experimental and theoretical study is presented of fluctuations observed by field ion microscopy in the catalytic reaction of water production on a rhodium tip. A stochastic approach is developed to provide a comprehensive understanding of the different phenomena observed in the experiment, including burst noise manifesting itself in a bistability regime, noisy oscillations, and nanopatterns with a cross-like oxidized zone separating the surface into four quadrants centered on the {111} facets. The study is based on a stochastic model numerically simulating the processes of adsorption, desorption, reaction, and transport. The surface diffusion of hydrogen is described as a percolation process dominated by large clusters corresponding to the four quadrants. The model reproduces the observed phenomena in the ranges of temperature, pressures, and electric field of the experiment. |
