| Abstract Scope |
MXenes, with their M<sub>n+1</sub>X<sub>n</sub>T<sub>x</sub> chemical formula, have one of the most diverse chemical compositions and structures among 2D materials. Because MXenes’ 2D surfaces (basal planes) are electrochemically active, they have emerged as potential electrocatalysts for the hydrogen evolution reaction (HER). The tunability of MXenes’ core chemistry and surface compositions enables a high degree of compositional control and surface modification to further enhance their HER activities. This talk will present how controlling the metal (M: Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W) and non-metal (X: C, N, O) combination, from a single metal MXene (e.g., Mo<sub>2</sub>CT<sub>x</sub>) to double metal (e.g., W<sub>2</sub>TiC<sub>2</sub>T<sub>x</sub>, and high-entropy MXene (with up to nine metals), influences their electrocatalytic activity of MXenes. By synthesizing and evaluating over 30 different MXene compositions and their hybrids, we will present the key contributors that enhance HER activity and achieve overpotential < 150 mV at 10 mA/cm2 under acidic conditions. |