عنوان المقالة:Flakes Size-Dependent Optical and Electrochemical Properties of MoS2 Flakes Size-Dependent Optical and Electrochemical Properties of MoS2
جمعه عبدالجواد محمد على | Gomaa A. M. Ali | 20545
- نوع النشر
- مجلة علمية
- المؤلفون بالعربي
- Eslam A. A. Aboelazm, Gomaa A. M. Ali, H. Algarni, Kwok Feng Chong
- المؤلفون بالإنجليزي
- Eslam A. A. Aboelazm, Gomaa A. M. Ali, H. Algarni, Kwok Feng Chong
- الملخص العربي
- 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.
- الملخص الانجليزي
- 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.
- تاريخ النشر
- 01/03/2018
- الناشر
- Current Nanoscience
- رقم المجلد
- رقم العدد
- رابط الملف
- تحميل (721 مرات التحميل)
- رابط خارجي
- http://www.eurekaselect.com/160156
- الكلمات المفتاحية
- Molybdenum disulfide, nanoflakes, optical band gap, supercapacitors, cyclic voltammetry