Standing Wave Patterns in the CO Oxidation Reaction on a Pt(110) Surface: Experiments and Modeling^†

Standing waves are a special type of spatio-temporal pattern observed in the CO oxidation reaction on Pt(110). We present new experimental data that indicate the important role played by the formation of subsurface oxygen. The formation of these patterns is correlated with reflective collisions of traveling waves that have previously been found in the same reaction. We also show that global coupling through the gas phase and external forcing are essential for stabilizing and synchronizing the standing wave patterns. The principal properties of the observed patterns are reproduced by numerical simulations based on an extended reaction−diffusion model.驻波是在铂(110)晶面（Pt(110)）上发生的一氧化碳（CO）氧化反应中观测到的一类特殊时空模式。本研究提供了全新的实验数据，证实次表层氧（subsurface oxygen）的形成在此过程中发挥了关键作用。此类模式的形成与此前在该反应中被观测到的行波（traveling waves）反射碰撞过程密切相关。本研究同时表明，通过气相介质实现的全局耦合与外场驱动（external forcing），是稳定并同步驻波模式的必要条件。基于拓展反应扩散模型（reaction-diffusion model）开展的数值模拟，可复现观测到的该类模式的核心特性。