Mechanism and Kinetics of Oxidation Reaction of Aqueous Ti3C2TxSuspensions at Different pHs and Temperatures

Sehyun Doo, Ari Chae, Daesin Kim, Taegon Oh, Tae Yun Ko, Seon Joon Kim, Dong Yeun Koh, Chong Min Koo

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)22855-22865
Number of pages11
JournalACS Applied Materials and Interfaces
Volume13
Issue number19
DOIs
Publication statusPublished - 2021 May 19

Keywords

  • Arrhenius equation
  • MXene
  • oxidation kinetics
  • oxidation mechanism
  • stability

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint

Dive into the research topics of 'Mechanism and Kinetics of Oxidation Reaction of Aqueous Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>Suspensions at Different pHs and Temperatures'. Together they form a unique fingerprint.

Cite this