Direct synthesis of thickness-tunable MoS2 quantum dot thin layers: Optical, structural and electrical properties and their application to hydrogen evolution

α-MoO3 Crystals with a Multilayer Stack Structure Obtained by Annealing from a Lamellar MoS2/g-C3N4 Nanohybrid

“…After centrifugation at 4000 rpm for 1 h, a precipitate was formed, which was washed 3 times with distilled water and ethanol and then dried at 60 °C for 24 h. 1 g of this precipitate was introduced into a 40 mL Teflon-lined stainless steel autoclave and 30 mL of propylene carbonate were added, followed by stirring and heating at 200 °C for 24 h, yielding a solution that would contain [Mo(CH 4 N 2 S) 2 O 3 ]) (or, secondarily, some [(MoO 2 ) 2 O(C 6 H 8 O 7 ) 2 ] as a transient species). By centrifugation of this solution, a precipitate was obtained, in which MoS 2 would be the main component [ 15 , 16 ]. This precipitate was dried at 150 °C for 24 h.…”

MoS2 Quantum Dots Modified Black Ti3+–TiO2/g‐C3N4 Hollow Nanosphere Heterojunction toward Photocatalytic Hydrogen Production Enhancement

“…It is interesting that although the B‐TiO 2 /g‐C 3 N 4 /MoS 2 QDs obtain absorption similar to that of B‐TiO 2 /g‐C 3 N 4 , but it exhibits significant enhancement in photocatalytic HER, which indicates that the electrochemical properties of the MoS 2 QDs would play more important roles than the visible light absorption. The MoS 2 QDs, with lower potential and smaller grain diameter, can accept the photogenerated electrons from g‐C 3 N 4 and then transfer them to the solution more efficiently, which are unique advantages for the 0D QDs . In addition, compared with the traditional nanomaterials, the 0D MoS 2 QDs would provide much more edge S activity sites, which can promote the reduction of H + ions to improve the HER .…”

“…The MoS 2 QDs, with lower potential and smaller grain diameter, can accept the photogenerated electrons from g‐C 3 N 4 and then transfer them to the solution more efficiently, which are unique advantages for the 0D QDs . In addition, compared with the traditional nanomaterials, the 0D MoS 2 QDs would provide much more edge S activity sites, which can promote the reduction of H + ions to improve the HER . Thus, in such a system, driven by the ternary heterojunction, the excited photon‐generated electron (CB of g‐C 3 N 4 ) would transfer to the MoS 2 QDs and Ti 3+ –TiO 2 .…”

WS(1−x)Sex Nanoparticles Decorated Three-Dimensional Graphene on Nickel Foam: A Robust and Highly Efficient Electrocatalyst for the Hydrogen Evolution Reaction

“…Recently, Zhou et al has reported ternary tungsten sulfoselenide (WS 2(1− x ) Se 2 x ) particles with a 3D porous metallic NiSe 2 foam to have excellent catalytic performance with −88 mV@10 mA cm −2 of overpotential, 46.7 mV dec −1 of Tafel slope, and 214.7 μA cm −2 of exchange current density [ 23 ]. Our group has recently demonstrated a facile way to prepare a MoS 2 QDs film using a solution process and WS 2 /CoSe 2 heterostructure for HER applications [ 24 , 25 ]. Moreover, ternary alloys of MoS 2(1− x ) Se 2x and WS 2(1− x ) Se 2 x were synthesized as a electrocatalyst for HER by a sputtering-CVD process with the overpotentials of −141 and −167 mV to drive 10 mA cm −2 and Tafel slopes of 67 and 107 mV dec −1 , respectively [ 26 ].…”