Interplay between the metal-support interaction and stability in Pt/Co₃O₄(111) model catalysts

Abstract

Metal-support interactions at the Pt/Co3O4(111) interface yield Ptδ+ species which control the stability of the supported nanoparticles.

Cobalt Oxide-Supported Pt Electrocatalysts: Intimate Correlation between Particle Size, Electronic Metal–Support Interaction and Stability

“…In Figure , we plot the Pt 4f core level spectra (380 eV photon energy) obtained from the Pt/Co 3 O 4 (111) model catalysts for conventional Pt NPs (b) and subnanometer Pt aggregates (c). Two spin–orbit doublets emerge in the Pt 4f spectra of as-prepared conventional Pt NPs at 71.5 (Pt 4f 7/2 ) and 72.3 eV (Pt 4f 7/2 ) which are associated with metallic Pt 0 and a partially oxidized Pt δ+ species at the metal/oxide interface, respectively. , In contrast to conventional NPs, no metallic Pt 0 was detected in the Pt 4f spectra of the subnanometer Pt aggregates. Instead, two spin–orbit doublets emerge at 72.4 (Pt 4f 7/2 ) and 73.9 eV (Pt 4f 7/2 ) associated with partially oxidized Pt δ+ and Pt 4+ species, respectively. , The absence of metallic Pt 0 suggests that EMSI leads to a modification of the electronic structure of all Pt atoms within the subnanometer particles (see Supporting Information, Chapter 3.1 for a more detailed discussion on the growth mode).…”

“…EMSI influences the stability of metal NPs on oxide supports and can increase the adhesion energy at the metal/oxide interface . Consequently, Pt NPs on oxide surfaces have shown enhanced resistance against sintering …”

Cluster Catalysis with Lattice Oxygen: Tracing Oxygen Transport from a Magnetite (001) Support onto Small Pt Clusters

“…A central question remains whether the oxidation step takes place at the cluster/support boundary or on the cluster. For larger nanoparticles on supports such as ceria 22,23 and Co3O4(111), 24 it was demonstrated that the reaction takes place on the particles via an oxygen reverse spillover, i.e. lattice oxygen transport onto the particles, which we will thus refer to as "lattice oxygen reverse spillover".…”

Insights into the Morphological Effect of Co3O4 Crystallite on Catalytic Oxidation of Vinyl Chloride

“…The contributions from Co 3+ and Co 2+ cations were identified at 779.5 and 781.1 eV, respectively [30]. Additionally, two satellite peaks, S 1 and S 2 , at 785.3 and 789.4 eV appeared due to electron correlations and final state effects in Co 2+ and Co 3+ cations, respectively [31]. In turn, the satellite S 3 was attributed to the spin orbit contributions of Co 2p 1/2 and also from satellites S 1 and S 2 [32][33][34].…”