Kinetic Monte Carlo simulation of oxygen exchange of SnO2 surface

Oxygen adsorption, dissociation and desorption kinetics at the SnO2 surface is simulated. Both the temperature dependence of equilibrium coverages of various forms of oxygen and their transient behavior in varying temperature are considered. The model is based on our earlier work on rate equation si mulations of ionosorbed oxygen, but now refined to include the "bridging" l attice oxygen atoms on the surface. Model for the electrical conductance of porous SnO2 material as a function of temperature and in terms of the effe cts from surface coverages of different oxygen components is presented. Wit h the present model, we are able to simulate the essential features in the experimental conductance dependence. (C) 2001 Elsevier Science B.V. All rig hts reserved.