Highly Efficient Visible Light Photocatalytic Activities in Self‐Assembled Metastable TiO₂/Bi₄MoO₉ Heterojunctions

Abstract

heterojunctions are synthesized using a hydrothermal method. TiO 2 nanoparticles, which were used as templates in the hydrothermal process, can induce the heterogeneous nucleation and one-dimensional preferential growth of Bi 4 MoO 9 to form TiO 2 /Bi 4 MoO 9 heterojunctions. The TiO 2 /Bi 4 MoO 9 heterojunctions exhibit very efficient visible-light photocatalytic activity, which is much higher than those of TiO 2 nanoparticles, Bi 4 MoO 9 microcubes and This article is protected by copyright. All rights reserved. 2TiO 2 /Bi 2 MoO 6 composites. This could be mainly ascribed to the synergistic effects of the band structure matching and the unique microstructure between TiO 2 nanoparticles and Bi 4 MoO 9 nanobelts in the heterojunctions. The Bi 4 MoO 9 nanobelts with ~150 nm in width promote the production of photo-generated electron-hole pairs due to its narrow band gap. The TiO 2 nanoparticles embedded into Bi 4 MoO 9 nanobelts still remain small size, large specific surface area and high crystallinity. These not only facilitate the transfer of photo-generated holes from Bi 4 MoO 9 nanobelts to TiO 2 nanoparticles, but also improve the holes capture rate on the surface of the heterojunctions.

Heterophase Interface and Surface Functionalization of TiOx/TiSix Metastable Nanofilms

“…The density of the (sub)surface defects has recently been demonstrated as a key mechanism controlling photocatalytic activity of TiO 2 [ 87 ] and its self‐assembled metastable heterojunctions. [ 88 ] Since the cohesive energy of TiO in TiO 2 is as high as 3.49 eV, which is comparable to that of TiO x (3.68 eV) with less than 0.2 eV offset. These values ​​contrast with those of TiSi 2 (i.e., 2.93–3.12 eV).…”

Preparation of TiO2 Nanorods Composites Doped with Silver Nanoparticles and Their Bactericidal Properties under Visible Light Irradiation

“…[ 11 ] Moreover, the recombination probability of photogenerated electron–hole pairs in TiO 2 is high, leading to easy deactivation of both holes and electrons in the excited state through various mechanisms: i) the recombination of electrons and holes; [ 12 ] ii) migrating to the particle surface to undergo redox reactions with other adsorbed electron donors or acceptors; [ 13 ] iii) its captured by the metastable surface, etc., which restrict its development. [ 14 ] Until now, significant efforts have been devoted to enhancing the photocatalytic properties of TiO 2 . the primary research directions for modifying TiO 2 involve improving its photocatalytic efficiency and broadening its light absorption wavelength range.…”

TiN Bridged All‐Solid Z‐Scheme CNNS/TiN/TiO2−x Heterojunction by a Facile In Situ Reduction Strategy for Enhanced Photocatalytic Hydrogen Evolution

“…There are many reports on photocatalyst materials in this respect, most of which are inorganic semiconductors, such as TiO 2 , WO 3 , and CdS. [ 5–7 ] In recent times, carbon nitride (CN) has been considered as a potential photocatalyst for hydrogen generation due to the advantages of cheapness, tunable electron band structure, and favorable stability. [ 8–10 ] However, so far, the practical application of CN still faces limitations, such as low exposure of catalytic active sites, narrow visible light response window, low photocatalytic charge separation efficiency, which leads to low photocatalytic efficiency.…”