“…On the other hand if all reactionable oxygen species were taken off the layer surface, the conductivity of the layer was maximal (low resistance). The relationship between the conductivity of the active layer and concentration of the reagents can be described by following equation [1]: (1) where C O2 , C R are the oxygen and detected concentration in the gas phase above the active layer surface, σ max is maximal conductivity, σ 0 minimal layer conductivity, k R , k A are the rates constants of reduction, adsorption, m is the stoichiometric coefficient accounting for the number of oxygen species involved in reaction.…”