About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Materials for Energy Conversion and Storage 2023
|
Presentation Title |
Assembled MXene/Carbon Nanotube Electrodes with Anomalous Electrochemical Response |
Author(s) |
Kyle Matthews, Armin VahidMohammadi, Teng Zhang, Yury Gogotsi |
On-Site Speaker (Planned) |
Kyle Matthews |
Abstract Scope |
MXenes are a family of two-dimensional (2D) transition metal carbonitrides that have shown promising properties for electrochemical charge storage applications. However, these materials show capacitive-like response in aqueous electrolytes with the exception of protic electrolytes such as H2SO4 where redox peaks are observed. Particularly, MXenes tested in aqueous neutral electrolytes exhibit quasi-rectangular cyclic voltammograms. In this presentation, we demonstrate that through changing MXenes’ electrode structure, these materials can show anomalous electrochemical response with distinct redox couples in neutral aqueous electrolytes. We show this behavior in hybrid vanadium and titanium MXene electrodes, where the free-standing films exhibit a distinct cyclic voltammograms in various alkali cation containing electrolytes with distinct cathodic and anodic peaks, unlike the pristine versions, which display a capacitive response. The observed phenomena in hybrid structures indicates a different charge storage mechanism in these electrodes while maintaining or increasing the overall amount of the charge that can be stored. |
Proceedings Inclusion? |
Planned: |
Keywords |
Energy Conversion and Storage, Nanotechnology, Composites |