Theory of NO/K phase mixing, separation and catalytic promoter action on Co{1 0 1̄ 0}

A recently proposed model for the complete phase separation of K and NO on the Co{1 0 1̄ 0} surface is discussed in the context of first-principles density functional theory calculations. The present results are inconsistent with the segregated model, suggesting that a reinterpretation of the original experimental data may be necessary.