| 초록 |
Despite the remarkable strengths in materials properties including high electrical conductivity and atomically thin nanoscale structure, Ti3C2Tx MXene has not yet been widely used due to its vulnerable ambient stability against oxidation. Herein, we report on the effects of pH and temperature on the oxidation kinetics of Ti3C2Tx aqueous suspensions. The oxidation rate is faster in acidic pH and high temperature conditions, and it follows the Arrhenius equation. To the best of our knowledge, the mechanism of Ti3C2Tx oxidation is considered as an acid-catalyzed reaction where the protonation of the surface terminal groups induces the electron localization on titanium atoms and accelerates the oxidation rate. On the contrary, in the basic pH condition, the electrostatic sodiation results in less electron localization on titanium atoms, and thus, retards the oxidation rates. |
