Heterostructured d‐Ti₃C₂/TiO_2/g‐C₃N₄ Nanocomposites with Enhanced Visible‐Light Photocatalytic Hydrogen Production Activity

Abstract

The construction of a 2D–2D heterostructured composite is an efficient method to improve the photocatalytic hydrogen generation capability under visible light. In this work, simple heat treatment of a mixture of g‐C3N4 and delaminated Ti3C2 was used to prepare a series of d‐Ti3C2/TiO2/g‐C3N4 nanocomposites. The d‐Ti3C2 not only acted as the support layer and resource to glue the anatase TiO2 particles and g‐C3N4 layers together but also served as the fast electron transfer channel to improve the photogenerated charge carriers’ separation efficiency. By tuning the g‐C3N4/d‐Ti3C2 mass ratio, heating temperature and soaking time, the d‐Ti3C2/TiO2/g‐C3N4 nanocomposite 4‐1‐350‐1 achieved an excellent H2 evolution rate of 1.62 mmol h−1 g−1 driven by a 300 W Xe lamp with a 420 nm cutoff filter. The heterostructured composite photocatalyst was stable even after 3 cycles, representing excellent potential for the practical application in solar energy conversion.

Visible‐light driven photodegradation of phenol over niobium oxide‐loaded fibrous silica titania composite catalyst

“…19,31 It was depicted that the numbers of both properties increased for 5 Nb/FST, as compared to the parent FST, indicating substitution of Nb ion into FST lattice as a dopant, had given rise in Ti 4+ vacancies and the release of oxygen due to the supplementary charge that was introduced into the lattice. 20,40 This result supported FTIR analysis when the Ti-O-Ti and Si-O-H network led to a decrease in number peaks, suggesting that the substitution of Nb ions on both band networks was responsible for the growth occurrences. 41,42 Fig .…”

“…This is most likely due to Nb 5+ having a slightly bigger ionic radius of 0.64 Å as compared to Ti 4+ (0.61 Å). 20,[24][25][26][27] The results are in good agreement with the crystallite size (- Table S1), which revealed that the increase of Nb 2 O 5 loading up to 5 wt% resulted in the crystallite size growing from 29.9 nm to 49.9 nm. Further incorporation of Nb 2 O 5 , up to 10 wt%, led to small shifting with a decreasing crystallite size to 35.0 nm.…”

“…Moreover, the successful substitution of Nb 5+ into FST lattice led to slightly up shifting of the CB level (Nb/FST), resulting in the formation of a heterojunction. 20 The combination of Ti 3d and Nb 4d states were found to downshift the CB edge of FST, suggesting that loading Nb 2 O 5 on the FSTcould result in a narrower band gap. Fig.…”

“…Transition metal ions into lattice of TiO 2 is recognized to be substituted easily with comparable ionic radii to that Ti 4+ . 20 Nb 5+ having slightly larger ionic radius than Ti 4+ . However, appropriates concentration of Nb 5+ simply can be incorporated into TiO 2 lattice, which can increase light-harvesting ability of TiO 2 into visible light spectrum.…”

Dry Mechanochemical Synthesis of Highly Luminescent, Blue and Green Hybrid Perovskite Solids

“…It is a simple method which can lead to higher purity due to the absence of processing additives and solvents. [21][22][23][24][25][26][27][28] Mechanochemical synthesis can be used to synthesize multicomponent compounds simply by mixing the chemical precursors in the appropriate stoichiometry. Impor-www.advopticalmat.de mixed accordingly to the targeted compound's stoichiometry MA 0.8 Cs 0.2 Pb(Br 0.6 Cl 0.4 ) 3 inside a nitrogen-filled glove box and introduced in a 10 mL zirconia ball-mill jar together with zirconia beads.…”