Electrocatalytic and Optoelectronic Characteristics of the Two-Dimensional Titanium Nitride Ti4N3Tx MXene

Nathan Neale, Abdoulaye Djire, Hanyu Zhang, Elisa Link, Jun Liu

Research output: Contribution to journalArticlepeer-review

95 Scopus Citations

Abstract

A relatively new class of two-dimensional (2D) materials called MXenes have garnered tremendous interest in the field of energy storage and conversion. Thus far nearly all MXenes reported experimentally have been described as metals, with a lone report of a mixed-metal carbide phase exhibiting semiconducting character. Here, we report the optical, electrocatalytic, and electrical properties of the 2D Ti 4 N 3 T x MXene (T x = basal plane surface terminating groups) and show that this material exhbits both metallic and semiconducting behaviors. We provide complete structural characterization of exfoliated Ti 4 N 3 T x MXene and assign T x = O and/or OH and find that this material is susceptible to surface oxidation. Optical experiments indicate that the exfoliated Ti 4 N 3 T x MXene forms a hybrid with a thin surface oxide layer resulting in visible light absorbtion at energies greater than ∼2.0 eV and an excitation wavelength-dependent defect-state emission over a broad range centered at ∼2.9 eV. As an electrocatalyst for the hydrogen evolution reaction, the exfoliated Ti 4 N 3 T x shows an overpotential of ∼300 mV at -10 mA cm -2 and a Tafel slope of ∼190 mV dec -1 . Finally, we observe semiconducting behavior at temperatures below ∼90 K from temperature-dependent transport measurements under 5 T magnetic field likely resulting from the thin oxide layer. These results unveil the intriguing optical, electrocatalytic, and electrical properties of this 2D Ti 4 N 3 T x MXene that expands the potential of these new 2D materials into electrocatalysis and (opto)electronic applications.

Original languageAmerican English
Pages (from-to)11812-11823
Number of pages12
JournalACS Applied Materials and Interfaces
Volume11
Issue number12
DOIs
StatePublished - 27 Mar 2019

Bibliographical note

Publisher Copyright:
© 2019 American Chemical Society.

NREL Publication Number

  • NREL/JA-5900-71662

Keywords

  • 2D materials
  • energy conversion
  • nitride MXenes
  • semiconductors
  • water splitting

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