Facile fabrication of PbS/MoS 2 nanocomposite photocatalyst with efficient photocatalytic activity under visible light

Enhanced photocatalytic performance of MoS 2 modified by AgVO 3 from improved generation of reactive oxygen species

“…(8)- (15). The combination of ESR and capture experiments determined (13), (14) to be the main mechanistic pathway. MoS2 + hv → e -(MoS2) + h + (MoS2) (8) AgVO3 + hv → e -(AgVO3) + h + (AgVO3) (9) e -(MoS2) →e -(AgVO3) (10) h + (AgVO3) → h + (MoS2) (11) O2 + e -(MoS2) →•O2  (12) O2 + 2e -(AgVO3) + 2H + → H2O2 (13) H2O2 + e -(AgVO3) →•OH + OH  (14) h + (MoS2) + •OH + H2O2 → Oxidative products (15)…”

“…Although the excitation of molybdenum disulfide (MoS2) to generate charge carriers via visible light is well known, the redox potential of electron/hole in the conduction/valence band is not high, the quantum efficiency of molecular oxygen activation is suppressed, and the number of active sites on the surface of the photocatalyst is insufficient. Vast efforts had been focused on overcoming the above problems, including the construction of hybrid composite structures [13], metal doping [14], metal embedding [15], coupling with other semiconductors to form a heterojunction [16], and morphology control to expose a high-energy surface. However, the growing number of studies only focused on expanding the light absorption range and improving the separation efficiency of charge carriers.…”

A comparative study on the photocatalytic degradation of organic dyes using hybridized 1T/2H, 1T/3R and 2H MoS2 nano-sheets

“…22 The activity of MoS 2 in electrochemical and photocatalytic water splitting was found to be substantially improved by increasing the density of active sites via introducing defects or increasing conductivity in composites with carbon based materials or other semiconductors. 3,[23][24][25][26][27] The electronic structure of 1T/2H phases has been the focus of several computational studies. 13,[28][29][30][31][32] The origin of the improved performance in HER catalysis by 1T/2H phase materials has been attributed to the enhanced charge mobility in the material, due to the enhanced metallic conductivity of 1T phases.…”

Structurally modified electrospun poly(methyl methacrylate) nanofibers as advanced host matrices for PbS quantum dots

“…It is observed from Figure 1(b) that, the FTIR peaks at 2923, 2851, and 1485–1564 cm −1 correspond to the aliphatic CH stretching of PMMA, CH 3 stretching mode of toluene and aromatic CC stretches in toluene respectively. The peak at 1397 cm −1 shows the frequencies due to hetero polar diatomic molecules of PbS 2,12,37–40 . The peaks of PMMA nanofibers are shifted to lower wavenumbers after incorporating PbS quantum dots due to the interaction between PMMA and PbS quantum dots.…”