Nb₂O₅ Nanorod Bundles for Photocatalytic Ethylene Oxidation

Abstract

Hierarchical metal oxide superstructures have been widely utilized in various applications, but complex template-assisted procedures and organic structure-directing agents are usually required during synthesis. Herein, a threedimensional (3D) bundle-like Nb 2 O 5 superstructure was fabricated by a simple hydrothermal method using amorphous Nb 2 O 5 •nH 2 O particles as precursors without the use of organic species and template precursors. Controlled experiments under different synthetic conditions revealed that a hierarchical assembly process occurred, in which Nb 2 O 5 nanorods were first formed due to the dissolution and recrystallization of Nb 2 O 5 •nH 2 O particles. The resultant nanorods were assembled into bundle-like nanostructures, which finally organized into flower-like superstructures. Upon decorating of ultrafine Pt nanoparticles (1.8 nm) on the surface of Nb 2 O 5 −S using a photodeposition method, the Pt−Nb 2 O 5 superstructures showed promising photoactivities for ethylene oxidation.

Highly Efficient Oxidation of Propane at Low Temperature over a Pt-Based Catalyst by Optimization Support

“…Among the supports of metal oxides, niobium pentoxide (Nb 2 O 5 ) is a credible candidate owing to its suitable redox ability, abundant water-resistant acid sites, and high chemical stability. , More importantly, Nb 2 O 5 has a high standard formation enthalpy (−Δ f H M‑O θ = 380 kJ/mol Oatom ) of the metal oxide and a relatively electron-rich oxygen atom. After loading the noble metal, slight electron transfer from the noble metal to O atoms occurs, and the noble metal supported on Nb 2 O 5 tends to exist in a metallic state. , Similar results have been reported in which Pd on metal oxide supports (TiO 2 and Nb 2 O 5 ) with high Δ f H M‑O θ was barely oxidized, resulting in stable metallic Pd particles .…”

Flux-Assisted Low Temperature Synthesis of SnNb2O6 Nanoplates with Enhanced Visible Light Driven Photocatalytic H2-Production

“…As shown in Figure A, both samples exhibit a wide visible light absorption from 400 to 600 nm. Compared with bulk SnNb 2 O 6 , the optical absorption edge of SnNb 2 O 6 nanoplates displays an obvious shift to shorter wavelengths (blue shift) due to its decreased particle size. − The band gaps of SnNb 2 O 6 nanoplates and bulk SnNb 2 O 6 were calculated to be 2.32 and 2.30 eV based on the Kubelka–Munk function (Figure B), respectively.…”

Nb–O–C Charge Transfer Bridge in 2D/2D Nb2O5/g‐C3N4 S‐Scheme Heterojunction for Boosting Solar‐Driven CO2 Reduction: In Situ Illuminated X‐Ray Photoelectron Spectroscopy Investigation and Mechanism Insight

“…[ 23–25 ] In recent years, except for some related works about the photocatalytic hydrogen evolution reaction and degradation of organic pollutants, there are few reports on the artificial photosynthesis of CO 2 photoreduction over Nb 2 O 5 ‐based nanocatalysts. [ 26–28 ] However, unlike the enzyme‐inspired catalysts, pristine Nb 2 O 5 photocatalysts always suffer from some disadvantages, such as the limited spectral response range, low charge separation efficiency, and restricted performances of the CO 2 reduction reaction. Therefore, it is necessary to further systematically study the structure and surface modification of niobium pentoxide photocatalysts to improve the selectivity and yield of CO 2 reduction by artificial photosynthesis.…”