Credit: Image courtesy of Zhu et al., J. Am. Chem. Soc. 137, 10156 (2015).
The arrows represent a schematic illustration of the multiple reaction regimes for carbon monoxide (CO) oxidation with the PtFe-FeOx/TiO2 system. The dashed arrows represent reaction pathways that utilize the PtFe and FeOx interface, while the solid arrow represents a reaction pathway that uses the nanowire (NW) and TiO2 interface. The inset shows a scanning electron transmission micrograph of the nanowires, with platinum (Pt, green) in the core of the NW and iron (Fe, red) drawn to the surface.