(Invited) Photoelectrochemical Behavior of Transition Metal Alloyed Nitride MXenes Academic Article uri icon

abstract

  • Two-dimensional (2D) MXenes based on early transition metal carbides and nitrides have highly tunable electrochemical properties including excellent catalytic activity for solar fuels generation. These properties can be manipulated by modifying the basal plane chemistry. In this presentation, we will describe our recent development of mixed transition metal nitride MXenes, M-Ti4N3Tx (M = V, Cr, Mo, or Mn; Tx = O and/or OH), by modifying pristine exfoliated Ti4N3Tx MXene with V, Cr, Mo, and Mn salts using a simple solution-based method. We will show that the transition metal alloying process induces highly tunable hydrogen evolution reaction (HER) electrocatalytic activity in 0.5 M H2SO4 electrolyte as follows: V-Ti4N3Tx > Cr-Ti4N3Tx > Mo-Ti4N3Tx > Mn-Ti4N3Tx > pristine Ti4N3Tx with overpotentials as low as 330 mV at 10 mA cm2. We further characterize these M-Ti4N3Tx MXenes using scanning electrochemical microscopy (SECM) to demonstrate that catalytic activity occurs on the basal plane, and additionally show that these MXenes exhibit semiconducting behavior. Lastly, we use in situ X-ray absorption spectroelectrochemistry to probe the transition metal oxidation states and unveil the mechanism of HER electrocatalysis.

published proceedings

  • ECS Meeting Abstracts

author list (cited authors)

  • Neale, N. R., Djire, A., Wang, X., Mirkin, M. V., & Reinhart, B. J.

citation count

  • 0

complete list of authors

  • Neale, Nathan R||Djire, Abdoulaye||Wang, Xiang||Mirkin, Michael V||Reinhart, Benjamin J

publication date

  • May 2021