Catalytic properties of group 4 transition metal dichalcogenides (MX₂; M = Ti, Zr, Hf; X = S, Se, Te)

Abstract

This work provides a first insight into the inherent electrochemistry and catalytic activities of group 4 transition metal dichalcogenides.

Atomic Layered Titanium Sulfide Quantum Dots as Electrocatalysts for Enhanced Hydrogen Evolution Reaction

“…The binding energies of Ti 2p peaks (458.3 eV for 2p 3/2 and 463.7 eV for 2p 1/2 ) are a little higher than that of TiS 2 , but lower than that of TiO 2 , suggesting partial oxidation of TiS 2 QDs at the edge due to oxidation sensitivity of TiS 2 to air. [9b] The binding energies of S 2− 2p 3/2 and 2p 1/2 peaks in TiS 2 QDs emerging at 161.0 and 162.2 eV agree with that of 1T‐TiS 2 . It indicates although a low extent of oxidized status on edge, TiS 2 QDs still maintain the main sulfide chemical status which is consistent with the Raman and XRD results.…”

“…It indicates although a low extent of oxidized status on edge, TiS 2 QDs still maintain the main sulfide chemical status which is consistent with the Raman and XRD results. [9b,16] TiS 2 QDs show a special optical property compared to TiS 2 nanosheets. The exfoliated TiS 2 nanosheets display a broad UV–vis absorption peak appeared at 545 nm which is ascribed to electronic transitions from the upper p‐bands into the lower triplet of nonbonding d‐bands (Figure c).…”

“…Additionally, it is predicted to possess more active edge sites than 2H‐MoS 2 . But the bulk 1T‐TiS 2 still exhibits deficient HER performance due to low density of accessible active sites and sluggish electron transfer kinetics across the interlayer . Here, we nanoengineered 1T‐TiS 2 into quantum dots (QDs) with atomic layer thickness in order to simultaneously enhance the density of edge sites and facilitate the electron transfer from the substrate to the edge sites.…”

TiS2 Monolayer as an Emerging Ultrathin Bifunctional Catalyst: Influence of Defects and Functionalization

“…Despite the fact that we observed several experimental investigations of catalytic activity for group IV TMDCs in bulk phases, [53] there is limited knowledge regarding the HER and OER mechanism on their monolayer counterparts. In particular, among the group IV TMDCs, Titanium disulfide (TiS 2 ) is the lightest weight, highly stable and low cost material and therefore has received a considerable attention over the recent past.…”

Intercalation makes the difference with TiS2: Boosting electrocatalytic water oxidation activity through Co intercalation

“…30 Even though much effort was put into understanding the ramifications of TiS 2 intercalation, [31][32][33] studies using this material have somewhat lessened in recent years. [34][35][36][37] Our approach to synthesizing new water oxidation catalysts stemmed directly from our previous work with transition metal sulfide materials for inclusion as hole transport materials (HTM) in perovskite solar cells. We recently synthesized amorphous TiS 2 nanoparticles that were highly conductive at low film thicknesses and found they functioned well as HTM materials even though they were heavily oxidized.…”