Oxidation-resistant titanium carbide MXene films

Two-dimensional transition metal carbides (MXenes) have attracted much attention due to their excellent electrical conductivity and outstanding performances in energy storage, telecommunication, and sensing applications. It is known that MXene flakes are readily oxidized in either humid air or aqueo...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2020, Vol.8 (2), p.573-581
Main Authors: Lee, Yonghee, Kim, Seon Joon, Kim, Yong-Jae, Lim, Younghwan, Chae, Yoonjeong, Lee, Byeong-Joo, Kim, Young-Tae, Han, Hee, Gogotsi, Yury, Ahn, Chi Won
Format: Article
Language:English
Subjects:
Aqueous environments
Bright annealing
Electric fields
Electrical conductivity
Electrical resistivity
Energy storage
Heat generation
Industrial applications
Infrared radiation
Metal carbides
MXenes
Organic chemistry
Oxidation
Oxidation resistance
Radiation
Relative humidity
Stability
Titanium
Titanium carbide
Transition metals
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Summary:Two-dimensional transition metal carbides (MXenes) have attracted much attention due to their excellent electrical conductivity and outstanding performances in energy storage, telecommunication, and sensing applications. It is known that MXene flakes are readily oxidized in either humid air or aqueous environments. While the chemical instability of MXenes may limit their use in applications involving ambient environments and long-term operation, oxidation behaviour of MXene films has not been addressed. In this work, we demonstrate a hydrogen annealing method to increase the oxidation stability of Ti 3 C 2 MXene in two different aspects: (1) dramatic improvement in the oxidation stability of pristine MXene films against harsh conditions (100% relative humidity, 70 °C), and (2) large recovery in the electrical conductivity of previously oxidized Ti 3 C 2 MXene films. We also demonstrate an electric-field-induced heater capable of stable operation under highly oxidizing conditions, based on the oxidation-resistant MXene film. A total loss of heat generation ability was observed for the as-prepared MXene film, while the hydrogen-annealed one maintained its bright infrared radiation, under the highly oxidizing conditions. This work offers a solution to industrial applications of unprotected MXene films, securing their stable and long-term operation in humid conditions. We have demonstrated a highly stable electric heater made of oxidation-resistant MXene film, which was capable of stable operation in air under highly oxidizing conditions (70 °C, 100% RH).
ISSN:2050-7488
2050-7496
DOI:10.1039/c9ta07036b