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Flakes Size-Dependent Optical and Electrochemical Properties of MoS2

[ Vol. 14 , Issue. 5 ]

Author(s):

Eslam Atef Abdelaziz Aboelazm, Gomaa Abdelgawad Mohammed Ali, Hamed Algarni and Kwok Feng Chong*   Pages 416 - 420 ( 5 )

Abstract:


Background: Molybdenum disulfide (MoS2) is a transition metal dichalcogenides and has some interesting and promising properties. MoS2 has direct and indirect band gaps depending on its crystalline structure. In addition, its sheets morphology makes it a good candidate for supercapacitor applications.

Objective: The aim of this work is to study the effect of MoS2 flakes size on its optical and electrochemical properties.

Method: MoS2 with different flakes sizes were prepared by exfoliation method. The exfoliation was performed by sonication of MoS2 powder in N,N-Dimethylformamide followed by different centrifugation speeds. UV-Vis spectra illustrated the optical energy gap was inversely proportional to the MoS2 flakes size.

Results: Absorption coefficient values indicated that the exfoliation reduced the number of layers. Symmetric supercapacitor was made from two MoS2 electrodes and tested in 6 M KOH electrolyte. The specific capacitance was found to be dramatically increased with decreasing flakes size (9.5 and 4.5 mF/cm2 for 0.26 and 0.98 µm flakes size, respectively).

Conclusion: These findings recommend that MoS2 can be the excellent electrode material for supercapacitor.

Keywords:

Molybdenum disulfide, nanoflakes, optical band gap, supercapacitors, cyclic voltammetry, Transition Metal Dichalcogenides (TMDs).

Affiliation:

Faculty of Industrial Sciences & Technology, Universiti Malaysia Pahang, Gambang, 26300 Kuantan, Faculty of Industrial Sciences & Technology, Universiti Malaysia Pahang, Gambang, 26300 Kuantan, Department of Physics, Faculty of Sciences, King Khalid University, P.O. Box 9004, Abha, Faculty of Industrial Sciences & Technology, Universiti Malaysia Pahang, Gambang, 26300 Kuantan

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