MRS Meetings and Events


EN04.13.03 2023 MRS Spring Meeting

Enhancement of Electrocatalytic Activity of Ti3C2Tx MXene by in-situ Tunable Interfacial Anion Doping and Structural Modification for Hydrogen Evolution Reaction

When and Where

Apr 26, 2023
8:15am - 8:30am




Anand Tiwari1,Andrew B. Hamlin1,Md Saifur Rahman1,Julia Huddy1,William Scheideler1

Dartmouth College1


Anand Tiwari1,Andrew B. Hamlin1,Md Saifur Rahman1,Julia Huddy1,William Scheideler1

Dartmouth College1
2D-layered MXenes have attracted increasing attention as promising low-cost, stable electrocatalysts for hydrogen production through electrolysis. However, poor intrinsic chemical activities, and limited active site densities currently inhibit MXenes as practical electrocatalysts for hydrogen evolution reaction (HER). Herein, these limitations are overcome by <i>in-situ</i> tunable interfacial chemical doping and structural modification with nonmetallic electron donors—by nitrosulfurization through simple heat treatment with thiourea as a nitrogen and sulfur source in 2D titanium carbide (Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>) MXene. Through this process, XPS analysis indicates that the substitution of nitrogen and sulfur occurs at the basal plane with controllable chemical compositions ranging from 2 - 4 at. % (Sulfur), and 5-15 at. % (Nitrogen). It is observed by HRTEM, SEM, and AFM that structure of the MXene is changed from planar nanosheets to hexagonal-nanoplate-decorated nanosheets. Moreover, it is confirmed by XRD that the interlayer spacing is increased after interfacial doping, which is expected to increase the diffusivity of electrolytes into the layers and enhance the electrocatalytic activity. The optimal modified Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene exhibits a high concentration of Ti-S and Ti-N bonds as well as the lowest overpotential of –260 mV and a Tafel slope of 85 mV/dec at a current density of 10 mA/cm<sup>2</sup> in 0.5 M H<sub>2</sub>SO<sub>4</sub>, which is three times lower than pristine MXene (overpotential: -770 mV, and Tafel slope: 247 mV/dec). This strategy to improve the electrocatalytic activity of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene for hydrogen evolution by a simple <i>in-situ</i> interfacial chemical doping and structural modification will open the possibility of manipulating the electrocatalytic performance of a broad range of MXenes.


2D materials

Symposium Organizers

Hong Li, Nanyang Technological University
Damien Voiry, University of Montpellier
Zongyou Yin, The Australian National University
Xiaolin Zheng, Stanford University

Symposium Support


Publishing Alliance

MRS publishes with Springer Nature