Engineering stable Pt nanoparticles and oxygen vacancies on defective TiO2 via introducing strong electronic metal-support interaction for efficient CO2 photoreduction

In situprobing of Pt/TiO2activity in low-temperature ammonia oxidation

“…29,30 However, unlike the Pt/Al2O3 catalysts, for the Pt/TiO2 system, there is a possibility of the metal-support interaction, which can influence the catalytic properties. [31][32][33][34][35][36] It was shown that the metal-support interaction can provide stabilization of the metal platinum particles. 31,33 Oxidation of the metal platinum particles with the formation of the oxide structures on the surface leads to deactivation of the catalysts of the ammonia oxidation reaction.…”

“…[31][32][33][34][35][36] It was shown that the metal-support interaction can provide stabilization of the metal platinum particles. 31,33 Oxidation of the metal platinum particles with the formation of the oxide structures on the surface leads to deactivation of the catalysts of the ammonia oxidation reaction. 13,19,37 Therefore, stabilization of metallic Pt species might be beneficial for the NH3+O2 catalytic process.…”

Asymmetric Multipole Plasmon-Mediated Catalysis Shifts the Product Selectivity of CO2 Photoreduction toward C2+ Products

“…This may be because vapor-phase CO 2 photoreduction on TiO 2 nanotubes surface-decorated by <10 nm-sized nanoparticles of Cu, Pt, Ru, Au, Pd, AuPd, ZnPd, Ag, etc. has primarily been reported to result in the dominant formation (>95% of all product molecules formed) of C 1 products such as methane, carbon monoxide, methanol, and formaldehyde, with C 2 products such as ethane and ethylene being formed as minor byproducts (<5% of all products). − In metal particles larger than 50 nm, the quasi-static approximation is no longer valid and the quadrupole plasmon mode becomes significant, which produces an antisymmetric distribution of charge density oscillations on the surface of the metal nanoparticle when excited. , In even larger nanoparticles and aggregates of dissimilar nanoparticles, multipole plasmon excitations with rapidly alternating surface charge density oscillations dominate . Multipolar plasmon resonance modes and symmetry breaking in heterodimers , afford the possibility of closely lying reaction sites having opposite charge, thus enabling a reduction in the dipole repulsion of adsorbed C 1 reaction intermediates and facilitating their C–C coupling to form C 2 products.…”

Dopant and Defect Doubly Modified CeO2/g-C3N4 Nanosheets as 0D/2D Z-Scheme Heterojunctions for Photocatalytic Hydrogen Evolution: Experimental and Density Functional Theory Studies

“…Concerning the light utilization and the charge flow, it was essential to tune the electronic structures of semiconductors through defect engineering. Oxygen vacancies (OVs) were one of the most commonly and widely studied defects in transition metal oxides (TMOs). − A number of OV-engineered TMOs, such as TiO 2 , SnO 2 , and WO 3 , have been demonstrated to show the effective regulation of the light absorption to a visible region. − In particular, the CeO 2 with rich OVs was widely used in photocatalysis, but its photocatalytic performance was still unsatisfactory due to severe carrier recombination. − As an effective strategy for electronic structure modulation of the catalysts, heteroatom doping offers another effective strategy to promote the catalytic performance of catalysts. − It is reported that the heterometal doping could create OVs and narrow the semiconductor electronic band gap, which could significantly broaden the light response range and also serve as reactive sites to enhance the photogenerated carrier separation efficiency. − For example, Cu was incorporated into SnS 2 and favored introducing sulfur vacancies, thus providing a wider response range of visible light . Mi et al found that Fe­(III) doping could generate OVs in BiOCl ultrathin nanosheets, which extends the light absorption range and promotes the interface charge transfer .…”