About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Materials for Energy Conversion and Storage VII
|
Presentation Title |
Probing Structural Changes of 2D Supercapacitor Electrode by Kelvin Probe Force Microscopy |
Author(s) |
Kowsik Sambath Kumar, Nitin Choudhary, Deepak Pandey, Yi Ding, Luis Hurtado, Hee-Suk Chung, Laurene Tetard, Yeonwoong Jung, Jayan Thomas |
On-Site Speaker (Planned) |
Kowsik Sambath Kumar |
Abstract Scope |
Electrode materials in energy storage devices experience structural and chemical changes during cycling, which influences the long-term stability of the device. Currently there are limited qualitative analysis studies about the phenomenon behind these changes occurring at the electrode. For the first time, a surface analysis tool such as Kelvin probe force microscopy (KPFM) is employed to probe the reason behind capacitance increase of a two-dimensional (2D) electrode during cycling. We investigated the cycling performance of 2D electrode material, tungsten disulfide (WS2) via KPFM and Raman studies. The results revealed that during cycling, strain developed in the WS2 layers due to intercalation/deintercalation of electrolyte ions increased the available electrochemical active sites leading to increased capacitance. This strain led to increased redox charge storage behavior of the electrode during cycling, which was estimated from the capacitance contribution studies. Such qualitative studies will benefit in developing highly efficient and long-lasting energy storage devices. |
Proceedings Inclusion? |
Planned: |
Keywords |
Other, Other, Other |