| Synthesis of three-dimensional nanostructured electrode materials for high performance supercapacitors |
| Paper ID : 1048-UFGNSM-FULL |
| Authors: |
|
Elham Kamali *1, محمود حیدرزاده سهی2, Jang-Kyo Kim3, A. Ataie2 1Department of Metallurgy and Materials Engineering, Ferdowsi University of Mashhad 2University of Tehran 3Hong Kong University of Science and Technology |
| Abstract: |
| Supercapacitors are among promising energy conversion and storage devices due to their fast charge and discharge mechanism. However, they suffer from low energy density comparing to different types of batteries such as Li ion batteries. As energy density is directly related to the specific capacity, tailoring the electrode active material in such a way that results in higher specific capacity improves the energy density. In this research a three dimensional, flexible electrode material has been synthesized through a one-step hydrothermal method. Microscopic and chemical studies show that the electrodes consist of Ni3S2 nano rod arrays, directly grown on a graphene coated a nickel foam substrate. Electrochemical studies in a 3 electrode system show that the electrodes can deliver ultra-high specific capacitances of 1900 F g-1 and 1272 F g-1 at current densities of 1 and 10 A g-1 respectively. The unique nanostructure along with synergistic effects between graphene and Ni3S2 are the main reasons for such high electrochemical performance. Moreover, the electrodes also show a high and stable specific capacitance of 950 F g-1 after 2000 cycles at 10 Ag-1. TEM and XRD studies after the cyclic test, showed that the structure and chemical composition was preserved after long cycles, which is because of strong bonding between Ni3S2 and Ni foam. |
| Keywords: |
| Supercapacitor, Ni3S2, graphene foam |
| Status : Paper Accepted (Oral Presentation) |
