On a Two-Dimensional MoS 2 /Mo 2 CT x Hydrogen Evolution Catalyst Obtained by the Topotactic Sulfurization of Mo 2 CT x MXene
- Award ID(s):
- 1740795
- PAR ID:
- 10226430
- Date Published:
- Journal Name:
- Journal of The Electrochemical Society
- Volume:
- 167
- Issue:
- 12
- ISSN:
- 1945-7111
- Page Range / eLocation ID:
- 124507
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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Garnering attention for high conductivity, nonlinear optical properties, and more, MXenes are water-processable 2D materials that are considered candidates for applications in electromagnetic interference shielding, optoelectronic and photonic devices among others. Herein we investigate the intrinsic and photoexcited conductivity in Nb 2 CT x, a MXene with reported high photothermal conversion efficiency. DFT calculations show that hydroxyl and/or fluorine-terminated or is metallic, in agreement with THz spectroscopy, which reveals the presence of free charge carriers that are highly localized over mesoscopic length scales. Photoexcitation of Nb 2 CT x, known to result in rapid heating of the crystal lattice, is found to produce additional free carriers and a transient enhancement of photoconductivity. Most photoexcited carriers decay over the sub-picosecond time scales while a small fraction remain for much longer, sub-nanoseconds, times.more » « less
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