Abstract
The adsorption of CO molecules on Fe6O6 cluster was systematically studied at different coverage by GGA + U calculations and atomic thermodynamics. Starting from single CO molecule adsorption on Fe6O6 cluster, we have varied the concentration and configuration of CO molecules. It has been found that one surface iron atom of Fe6O6 cluster can coadsorb two CO molecules which can be explained well by the spatial effect. The phase diagrams show that twelve CO molecules binding on Fe6O6 cluster is favorable thermodynamically. It has been found that six CO molecules binding on Fe6O6 cluster is the saturation adsorption according to the stepwise adsorption energy, and the different adsorption states can coexist for two-CO molecules binding on Fe6O6 cluster at high temperature according to probability distribution plot. The adsorption mechanism of CO on Fe6O6 cluster was analyzed by the projected density of states and compared with Fe3O4 surfaces and other small iron oxide clusters.
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