Facile synthesis of vacancy-induced 2H-MoS₂ nanosheets and defect investigation for supercapacitor application

Abstract

In this paper, a 2D molybdenum disulfide (MoS2) nanosheet is prepared via a one-step hydrothermal method as electrode material for supercapacitors.

Stable Liquid-Sulfur Generation on Transition-Metal Dichalcogenides toward Low-Temperature Lithium–Sulfur Batteries

“…22 H 2 annealing introduces a sulfur deficiency on the basal plane, which improves the electrical conductivity of MoS 2 (Figure S7). 23,24 A closer examination shows that the change of droplet size becomes slower with an increase in time, which is consistent with a diffusion-controlled reaction. 25 Further studies are needed to elucidate the origin of the distinct kinetic transition behavior of sulfur growth in a liquid electrochemical system.…”

High-Performance MnO2 Nanowire/MoS2 Nanosheet Composite for a Symmetrical Solid-State Supercapacitor

“… where E is the energy density, P is the power density, C sp is the gravimetric specific capacitance calculated through GCDs, V is the voltage window, and Δ t is the discharge time. 20 , 21 , 23 − 26 …”

“…Generally, the 1T phase exhibits an improved hydrophilic behavior and an excellent electrical conductivity higher than that of 2H–MoS 2 , which directs to a higher specific capacitance in a liquid electrolyte. 22 − 26 Accordingly, 1T MoS 2 could be a suitable electrode material for manufacturing high-performance solid-state SCs. On the other hand, layered 1T-MoS 2 nanosheets lead to restacking due to the out-of-plane van der Waals (vdW) force of attraction between adjacent layers, reducing the active surface area and preventing effective electrolyte ion diffusion, ensuing in a faster decay of electrochemical performance.…”

“…The layered structure provides more surface area for charge storage and different oxidation states from +2 to +6 of the central Mo atoms to increase the pseudocapacitance. Generally, the 1T phase exhibits an improved hydrophilic behavior and an excellent electrical conductivity higher than that of 2H–MoS 2 , which directs to a higher specific capacitance in a liquid electrolyte. − Accordingly, 1T MoS 2 could be a suitable electrode material for manufacturing high-performance solid-state SCs. On the other hand, layered 1T-MoS 2 nanosheets lead to restacking due to the out-of-plane van der Waals (vdW) force of attraction between adjacent layers, reducing the active surface area and preventing effective electrolyte ion diffusion, ensuing in a faster decay of electrochemical performance. − To control the reaggregation and possible phase change of 1T-MoS 2 , which leads to poor performance, a solution-processable method to get MoS 2 nanosheets with stable dispersion is required to explore the spectrum of practical uses.…”

A facile synthesis of CuSe nanosheets for high-performance sodium-ion hybrid capacitors

“…14,15 In recent years, transition metal chalcogenides have received considerable attention owing to their controllable nanostructures and excellent sodium storage performance. [16][17][18][19] Compared with metal sulphides, metal selenides have higher electronic conductivity because Se is more conductive than S, and the metal-selenide bonds break more easily in the conversion reaction with sodium, which leads to superior rate capability and high reversible capacity. 17,20,21 Copper selenides, anisotropic p-type semiconductor materials, are used in gas sensors, solar cells, and electrochemical energy storage because of their abundance, low cost and high capacity.…”