Oxidative Stability of Nb<sub><i>n</i>+1</sub>C<sub><i>n</i></sub>T<sub><i>z</i></sub> MXenes
Ian J. Echols (9622607)Dustin E. Holta (9622601)Vrushali S. Kotasthane (10981868)Zeyi Tan (8115395)Miladin Radovic (6239030)Jodie L. Lutkenhaus (1357074)Micah J. Green (1421404)
Abstract
Despite\nprior reports on oxidation and oxidation mitigation for\nTi<sub><i>n</i>+1</sub>C<sub><i>n</i></sub>T<sub><i>z</i></sub> MXenes, there have been no reports on the\noxidative stability of MXene dispersions outside of this family to\ndate, including Nb-based MXenes. Here, we monitor the oxidative stability\nof Nb<sub><i>n</i>+1</sub>C<sub><i>n</i></sub>T<sub><i>z</i></sub> MXenes by using UV–vis absorbance\nand XPS and demonstrate methods to mitigate oxidation. We show that\nthe inclusion of an antioxidant (i.e., ascorbic acid) and low temperature\nstorage improve the oxidative stability of Nb<sub><i>n</i>+1</sub>C<sub><i>n</i></sub>T<sub><i>z</i></sub> MXenes. We also demonstrate that MXenes with higher “<i>n</i>” are more oxidatively stable. Our results suggest\nthat the use of an antioxidant and low temperature storage may be\ngeneralized for improving the oxidative stability of all MXenes outside\nof the Ti<sub><i>n</i>+1</sub>C<sub><i>n</i></sub>T<sub><i>z</i></sub> family. This discovery shows potential\nfor the future use of new MXenes and that MXenes with higher “<i>n</i>” are more favorable for long-term storage and use.
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