Speaker
Mr
Zakhele Ndala
(Wits university)
Description
Molybdenum diselenide(MoSe2) is a layered material that has attracted a lot of interest in the scientific community; the 2D nanomaterials derived from the bulk crystals of these materials have been found to have exceptional electronic and optical properties. These properties include a high surface to volume ratio, high carrier mobility, relatively high stability and a band-gap in the visible region of the electromagnetic spectrum. One possible application for these materials is as electrode materials in supercapacitors. Supercapacitors are energy storage devices that have high power densities, high cycle stability, large operational temperature range and a higher energy density than conventional capacitors. Unfortunately, these devices suffer from low energy densities compared to batteries. To circumvent this major drawback nanomaterials are being explored as alternatives to activated carbon for use as electrode materials in supercapacitors. In this work a novel colloidal synthetic method has been developed to synthesize 2H hexagonal phase MoSe 2 nanomaterials with a nanosheets and nanoflower morphology for supercapacitor applications. The electrochemical performance of the two morphologies were compared to determine the best suitable MoSe2 nanomaterials morphology for the application. The MoSe2 nanomaterials displayed electric double capacitance. The specific capacitance of the MoSe2 nanosheets and nanoflowers was determined to be 30 Fg-1 and 81 Fg-1 respectively. The impedance MoSe2 nanosheets and nanoflowers was determined to be 57.1 Ω and 34.0 Ω respectively. The nanoflowers morphology has superior electrochemical performance because the 3D interconnected nature of the nanoflowers gives them higher surface area and pore volume.
Supervisor details<br><b>If not a student, type N/A.</b><br>Student abstract submision<br>requires supervisor permission:<br>please give their name,<br> institution and email address.
Prof Nosipho Moloto
Wits university
nosipho.moloto@wits.ac.za
| Please confirm that you<br>have carefully read the<br>abstract submission instructions<br>under the menu item<br>"Call for Abstracts"<br><b>(Yes / No)</b> | Yes |
|---|---|
| Consideration for<br>student awards<br><b>Choose one option<br>from those below.</b><br>N/A<br>Hons<br>MSc<br>PhD | PhD |
Primary authors
Dr
Nosipho Moloto
(University of the Witwatersrand)
Ms
Siziwe Gqoba
(Wits university)
Mr
Zakhele Ndala
(Wits university)
