@article{78de327adb434b9fbdbc41491e2ef15a,
title = "Mechanism and Kinetics of Oxidation Reaction of Aqueous Ti3C2TxSuspensions at Different pHs and Temperatures",
abstract = "Understanding the oxidation reaction of aqueous Ti3C2Tx MXene suspensions is very important for fostering fundamental academic studies as well as widespread industrial applications. Herein, we investigated the mechanism and kinetics of the oxidation reaction of aqueous Ti3C2Tx suspensions at various pH and temperature conditions. Through comprehensive analysis, the mechanism of the chemical oxidative degradation of aqueous Ti3C2Tx colloids was established. Chemical oxidation produces solid products such as TiO2 and amorphous carbon as well as various gaseous species including CH4, CO, CO2, and HF. Additionally, our comprehensive kinetic study proposes that aqueous Ti3C2Tx dispersions are degraded via an acid-catalyzed oxidation reaction, where, under acidic conditions, the protonation of the hydroxyl terminal groups on the Ti3C2Tx flakes induces electron localization on titanium atoms and accelerates their oxidation reaction. In contrast, under basic conditions, the electrostatically alkali-metalized hydroxyl intermediates forming a bulky solvent cage results in less electron localization on titanium atoms, and thus retards their oxidative degradation. ",
keywords = "Arrhenius equation, MXene, oxidation kinetics, oxidation mechanism, stability",
author = "Sehyun Doo and Ari Chae and Daesin Kim and Taegon Oh and Ko, {Tae Yun} and Kim, {Seon Joon} and Koh, {Dong Yeun} and Koo, {Chong Min}",
note = "Funding Information: This work was supported by a grant from the Basic Science Research Program (2017R1A2B3006469 and 2021M3H4A1A03047327) through the National Research Foundation of Korea, funded by the Ministry of Science, ICT and Future Planning; and the Construction Technology Research Project (19SCIP-B146646-02), funded by the Ministry of Land, Infrastructure, and Transport, Republic of Korea. This work was partially supported by KU-KIST Research and KIST Internal Research Grand Challange programs, funded by the Korea Institute of Science and Technology (KIST). Funding Information: This work was supported by a grant from the Basic Science Research Program (2017R1A2B3006469 and 2021M3H4A1A03047327) through the National Research Foundation of Korea, funded by the Ministry of Science, ICT and Future Planning; and the Construction Technology Research Project (19SCIP-B146646-02), funded by the Ministry of Land Infrastructure, and Transport, Republic of Korea. This work was partially supported by KU-KIST Research and KIST Internal Research Grand Challange programs, funded by the Korea Institute of Science and Technology (KIST). Publisher Copyright: {\textcopyright} 2021 American Chemical Society.",
year = "2021",
month = may,
day = "19",
doi = "10.1021/acsami.1c04663",
language = "English",
volume = "13",
pages = "22855--22865",
journal = "ACS Applied Materials and Interfaces",
issn = "1944-8244",
publisher = "American Chemical Society",
number = "19",
}