| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
| Presentation Title |
Effect of Cation Pre-intercalation on the Electrochemical Performance of Multilayer Ti<sub>3</sub>C<sub>2</sub> MXene in Aqueous Electrolyte |
| Author(s) |
Kaitlyn E. Prenger, Ameer Al-Temimy, Kun Liang, Simone Raoux, Tristan Petit, Michael Naguib |
| On-Site Speaker (Planned) |
Kaitlyn E. Prenger |
| Abstract Scope |
Electrically conductive 2D transition metal carbides/nitrides (MXenes) have enormous potential for electrochemical energy storage, as they can host ions and protons and possess high electrical conductivity. While delaminated Ti<sub>3</sub>C<sub>2</sub> MXene paper has high capacitance, areal capacitance is limited. Multilayer Ti<sub>3</sub>C<sub>2</sub> shows modest values overall.
Herein, we present the electrochemical performance of multilayer Ti<sub>3</sub>C<sub>2</sub> MXene pre-intercalated with cations (Na<sup>+</sup>, K<sup>+</sup>, Mg<sup>2+</sup>)in H<sub>2</sub>SO<sub>4</sub>. At 5 A/g, gravimetric capacitance of 325 F/g was achieved, comparable to delaminated Ti<sub>3</sub>C<sub>2</sub> electrodes, but much higher than reported for multilayer MXene. Moreover, areal capacitance up to 2 F/cm<sup>2</sup> was achieved. Intercalated multilayer Ti<sub>3</sub>C<sub>2</sub> yields an easier avenue for making Ti<sub>3</sub>C<sub>2</sub> supercapacitor electrodes with high areal capacitance. X-ray absorption spectroscopy shows that changing cations between layers alters the oxidation state of titanium atoms in Ti<sub>3</sub>C<sub>2</sub>, whereas dispersing Ti<sub>3</sub>C<sub>2</sub> in H<sub>2</sub>SO<sub>4</sub> resulted in reducing the surface titanium atoms. These results encourage further investigation into modifying Ti<sub>3</sub>C<sub>2</sub> interlayer chemistry. |