The selective blocking of potentially catalytically active sites on surface-supported iron oxide catalysts

Abstract

The extensive research on ferrous oxide (FeO) over the last few decades has significantly contributed to the understanding of its structural and catalytic properties at the nanoscale. In this regard,...

Nanoscale Chemical Probing of Metal-Supported Ultrathin Ferrous Oxide via Tip-Enhanced Raman Spectroscopy and Scanning Tunneling Microscopy

“…As illustrated in Figure a, FeO nanoislands are mainly in a truncated triangle shape with a hexagonal honeycomb-like moiré superlattice. The moiré periodicity is measured to be ∼3.23 nm, consistent with our previous report . Notably, the moiré superlattice can be imaged as honeycomb or triangle patterns, indicating a bias-dependent morphology (Figure S1).…”

“…The moiré periodicity is measured to be ∼3.23 nm, consistent with our previous report. 35 Notably, the moiré superlattice can be imaged as honeycomb or triangle patterns, indicating a bias-dependent morphology ( Figure S1 ). The zoomed-in STM image exhibits a hexagonal atomic lattice of FeO with a lattice constant of ∼3.05 Å (blue rhombus in Figure 1 b).…”

“…The importance of metal-supported ultrathin metal oxides has been well established in the past decades due to their excellent performance in heterogeneous catalysis. − Significantly, extensive research has been carried out on ultrathin ferrous oxide (FeO) owing to its unique structural properties and high catalytic activity . Ultrathin FeO has been prepared on diverse metal surfaces, such as Pt(111), − Pt(100), , Pd(111), Pd(100), Mo(100), Cu(111), Cu(100), , Cu(110), Ru(0001), , Ag(111), Ag(100), − and Au(111). − These studies underscore the role of interfacial interactions with substrates in determining the morphologies and properties of ultrathin FeO films. − In particular, local interfacial features like defects, low-coordination surface sites, and oxidation sites , have been demonstrated to have striking impacts on the structure and reactivity of FeO. Thus, it is of significant importance to gain chemical insight into the local structural and interfacial properties of FeO on metals.…”