2D/2D Heterojunction of R-scheme Ti3C2 MXene/MoS2 Nanosheets for Enhanced Photocatalytic Performance

Abstract

Combination of two-dimensional (2D) materials and semiconductors is considered to be an effective way for fabricating photocatalysts for solving the environmental pollution and energy crisis. In this work, novel 2D/2D heterojunction of R-scheme Ti 3 C 2 MXene/MoS 2 nanosheets is successfully synthesized by hydrothermal reaction. The photocatalytic activity of the Ti 3 C 2 MXene/MoS 2 composites is evaluated by photocatalytic degradation and hydrogen evolution reaction. Especially, 0.5 wt% Ti 3 C 2 MXene/MoS 2 sample exhibits optimum methyl orange (MO) degradation and H 2 evolution rate of 97.4% and H 2 evolution rate of 380.2 μmol h −1 g −1 , respectively, which is attributed to the enhanced optical absorption ability and increased specific surface area. Additionally, Ti 3 C 2 MXene coupled with MoS 2 nanosheets is favorable for improving the photocurrent response and reducing the electrochemical impedance, leading to the enhanced electron transfer of excited semiconductor and inhibition of charge recombination. This work demonstrates that Ti 3 C 2 MXene could be a promising carrier to construct 2D/2D heterojunction in photocatalytic degradation and hydrogen evolution reaction.

Mo2C-MXene/CdS Heterostructures as Visible-Light Photocatalysts with an Ultrahigh Hydrogen Production Rate

“…All of the samples have the SSA in the range of 14.5–18.0 m 2 g –1 . MC2.5 has the highest SSA (18.0 m 2 g –1 ), which is larger than the SSA of the Ti 3 C 2 heterostructure in previous reports (Ti 3 C 2 /CdS: 7.2 m 2 g –1 and Ti 3 C 2 /MoS 2 : 10.2 m 2 g –1 ). The PV is 0.03–0.13 cm 3 g –1 , which is 3–7 times higher than that of Ti 3 C 2 /CdS .…”

“…According to the above experimental results, the microstructure of Mo 2 C/CdS synthesized in this study is quite different from the cauliflower structure of Ti 3 C 2 /CdS and the flowerlike structure of Ti 3 C 2 /MoS 2 . The formation of this unique microstructure can be explained from two aspects, as shown in the schematic illustration (Figure ).…”

Dye degradation performance, bactericidal behavior and molecular docking analysis of Cu-doped TiO2 nanoparticles

“…Cu-doped TiO 2 showed signicant results when compared with the data reported in the literature and included in Table 2. 72,73 Based on these ndings, Cu-doped TiO 2 can be considered to possess an excellent potential for use toward treatment of polluted water.…”

Photocatalytic and bactericidal properties and molecular docking analysis of TiO2nanoparticles conjugated with Zr for environmental remediation

“…Rate constant (k) increase with an increase in doping ratio (Table 2). 27,[112][113][114] As discussed above, the enhanced photocatalytic activity of nanoparticles may be ascribed mainly to these measures: rstly, the preservation of structure in nanoparticles as well as a high specic surface area that promotes broad absorption of UV irradiation within the catalyst and provides more surface active sites for reactants, thus helping to enhance the activities of photo-degradation. Secondly, the incorporation of Zr in TiO 2 lattice inhibits the growth of anatase crystal during annealing, thus the resulting smaller anatase crystals provide photo-induced electron-hole pairs with shorter migration periods therefore assisting in wider availability of reaction sites, which ultimately results in the improvement of photocatalytic performance.…”