Regulating the Metal Concentration for Selective Tuning of VS₂/MoS₂ Heterostructures toward Hydrogen Evolution Reaction in Acidic and Alkaline Media

Abstract

Two-dimensional layered transition metal dichalcogenides (TMDCs) offer an opportunity to develop inexpensive and noble metal-free catalysts for hydrogen evolution reaction (HER). Considering MoS2 as potential HER electrocatalysts, 2D VS2 has not been extensively studied for the HER process. VS2/MoS2 heterostructures were synthesized using an annealing method to understand the effect of one 2D material on another. The most efficient HER electrocatalysts are achieved through structural and electronic modification by regulating the Mo and V ratio. The XRD, HR-TEM, and Raman analysis indicate that interfacial coupling interactions favor lateral and/or vertical epitaxial growth mechanisms. Edge-exposed active sites and interfacial structural integrity provide a faster electron and mass transport. Electrochemical analysis suggested that optimized heterostructure achieved 115 and 148 mV overpotentials to attain a benchmark current density of 10 mA cm–2 in acidic and basic media. The improved performance can be identified through synergistic effects, resulting in enhanced active sites, electrical conductivity, and optimized energy levels.

Research progress of transition-metal dichalcogenides for the hydrogen evolution reaction

“…This is attributed to the larger number of V 3+ groups and the suspended S atoms, which make the H adsorption–desorption process stronger. 129 A concept of collaborative division of labor among the components in the heterogeneous structure was proposed. A heterogeneous structure was formed by combining MoS 2 and PdSe 2 .…”

Elucidation of single atom catalysts for energy and sustainable chemical production: Synthesis, characterization and frontier science

“…Both Pt 1 /FeOx and Ir 1 /FeO x catalysts showed extraordinary catalytic performance for WGS, presenting a specific rate The progression of catalyst development from bulk nanoparticles to advanced support materials and single atom catalysts. Micrograph of (a) mono-functional 2.5%Ru5A catalysts [6] (adapted with permission from Elsevier b.v.), (b) bi-functional 2.5%Ru2.5%Ni5A catalysts [6] (adapted with permission from Elsevier b.v.), (c) bi-functional Co-ZnO-TUD-1 catalysts [7](adapted with permission from Springer Nature), (d) Ti-FeO-CNT catalyst via SEM [8](adapted with permission from Elsevier b.v.), (e) FeO-CNT via TEM [8](adapted with permission from Elsevier b.v.), (f) UiO-66-NH 2 MOF catalysts [9] (adapted with permission from Elsevier b.v.), (g) Ag@MOF-5 catalysts [10] (adapted with permission from Elsevier b.v.), (h) VS 2 /MoS 2 catalysts, where R1 represents the (002) and ( 100) crystal planes of MoS 2 , while R2 and R3 represent the ( 101) and ( 100) crystal planes of VS 2 [11] (adapted with permission from American Chemical Society), (i) VS 2 /MoS 2 catalysts showing position of VS 2 and MoS 2 [11] (adapted with permission from American Chemical Society), (j) Pt 1 /TiO 2 catalysts [11] (adapted with permission from Elsevier b.v.), (k) Zn 1 -N-C catalyst [12] (adapted with permission from Royal Society of Chemistry).…”

Interfacial Interaction in NiFe LDH/NiS2/VS2 for Enhanced Electrocatalytic Water Splitting

“…Video S1: The dynamic state of the constructed overall water-splitting system. Refs [ 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 ] are cited in the Supplementary Materials.…”