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We combined scanning tunneling microscopy (STM) and X-ray photoelectronspectroscopy (XPS) experiments with density functional theory (DFT)calculations to study dispersed tungsta clusters on anatase TiO$_2$(101).Following two different preparation methods, we found that monomeric WO$_3$species are the most stable configuration rather than WO$_3$ trimers,(WO$_3$)$_3$. The WO$_3$ monomers form tetrahedral WO$_4$ structures on anataseTiO$_2$(101), with one W$-$O bond and two W$-$O$-$Ti linkages per WO$_3$monomer. Locally, the WO$_3$ monomers form well-ordered (2$\times$1)structures. The discovered geometric structure of WO$_3$ on anataseTiO$_2$(101) opens up numerous opportunities for fundamental studies addressingtungsta and accurate structure activity studies of WO$_3$/TiO$_2$ modelcatalysts.

Monomeric, Two-Dimensionally Ordered WO$_3$ Clusters on Anatase TiO$_2$(101)