Hydrothermal Synthesis of Flower-Like MoS<SUB>2</SUB> Nanospheres for Electrochemical Supercapacitors

Abstract

Flower-like MoS2 nanospheres were synthesized by a hydrothermal route. The structure and surface morphology of the as-prepared MoS2 was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The supercapacitive behavior of MoS2 in 1 M KCl electrolyte was studied by means of cyclic voltammetry (CV), constant current charge-discharge cycling (CD) and electrochemical impedance spectroscopy (EIS). The XRD results indicate that the as-prepared MoS2 has good crystallinity. SEM images show that the MoS2 nanospheres have uniform sizes with mean diameter about 300 nm. Many nanosheets growing on the surface make the MoS2 nanospheres to be a flower-like structure. The specific capacitance of MoS2 is 122 F x g(-1) at 1 A x g(-1) or 114 F x g(-1) at 2 mv s(-1). All the experimental results indicate that MoS2 is a promising electrode material for electrochemical supercapacitors.

Simple Synthesis of Molybdenum Disulfide/Reduced Graphene Oxide Composite Hollow Microspheres as Supercapacitor Electrode Material

“…The specific capacitance of single electrode can be obtained based on the following equation: C s = It/ΔVm where C s (F·g −1 ) is the specific capacitance, I (A) is the constant current, t (s) is the discharge time, ΔV (V) is the potential window, m (g) is the mass of active electrode material [3,4,6]. Consequently, the C s of MoS 2 /RGO hollow microspheres is calculated to be 218.1 F·g −1 at the current density of 1 A·g −1 , which is not only pretty higher than that of bare MoS 2 microspheres (94.6 F·g −1 ) and bare RGO material (8.1 F·g −1 ) prepared in this work but also superior to that of other recently reported MoS 2 -based materials such as flower-like MoS 2 nanostructures, mesoporous MoS 2 material, hollow MoS 2 nanospheres, nanostructured MoS 2 cluster, MoS 2 /C, MoS 2 /SnS 2 , MoS 2 /SnO 2 composites and so on [3,6,11,12,13,14,15,16]. Figure 7d depicts the GCD curves of MoS 2 /RGO hollow microsphere electrode at different current densities and the variation of its C s with current density is plotted in Figure 7e.…”

“…For instance, Wang et al reported a 3D flower-like MoS 2 nanostructure with the specific capacitance of 168 F·g −1 at the discharge current density of 1 A·g −1 [11]. Zhou et al synthesized flower-like MoS 2 nanospheres through a hydrothermal process, which delivered a specific capacitance of 122 F·g −1 at 1 A·g −1 [12]. Ramadosset et al prepared a nanostructured mesoporous MoS 2 electrode material and it released a specific capacitance of 124 F·g −1 at 1 A·g −1 [13].…”

Facile construction of 3D graphene/MoS2 composites as advanced electrode materials for supercapacitors

“…One of them is flower-like MoS 2 , which can increase the surface area in contrast with bulk material due to the surface effect. On the basis of the published literature and our common knowledge of sulfur compounds, the possible synthesis routes for the flower-like MoS 2 can be described as follows [16,34,35]:…”

Few-layered MoSe2 nanosheets as an advanced electrode material for supercapacitors

“…Analogous to graphite, TMDCs consists of graphene like layers of MX 2 sheets (where M can be any metal ions of IV, V and VI group transition elements and X is a chalcogen, X may be S, Se and Te) which are stacked together by weak van der Waals force. Later, different morphologies of MoS 2 -, WS 2 -, and their composite-based materials were investigated as supercapacitor electrodes [12][13][14][15][16][17][18][19][20][21][22][23][24][25] . In 2007, a first report on the electrochemical double-layer capacitance measurement of MoS 2 nanowall films was published by Soon and Loh 11 , which opened up the field of TMDC-based electrode materials for supercapacitor applications.…”