Theoretical Screening of Transition Metal-Embedded Ti2N for High-Efficiency Hydrogen Evolution Reaction

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Detail(s)

Original languageEnglish
Pages (from-to)4152–4160
Journal / PublicationACS Sustainable Chemistry & Engineering
Volume10
Issue number13
Online published18 Mar 2022
Publication statusPublished - 4 Apr 2022

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Abstract

Transition metals (TMs) have been widely employed to realize various electrocatalytic applications of pristine materials. Herein, via density functional theory (DFT), the potential for the hydrogen evolution reaction (HER) of all single TMs embedded in Ti2N was screened. Our results show that embedded single TMs can tune the hydrogen adsorption with a volcano-like tendency, and Mo-Ti2N stands out with an optimal Gibbs free energy (ΔGH) of −0.097 eV. This can be further improved with an optimal ΔGH close to thermal neutrality by applying 1.2% tensile strain to Mo–Ti2N, and the excellent exchange current density exceeds that of most conventional metal catalysts. The chemical nature of the Mo–H bond under strain was analyzed by revealing the changes in internal electronic structure and establishing the relationship with adsorption energy. The results reveal the bonding mechanisms to clearly show that a single TM atom embedded in Ti2N such as Mo-Ti2N is a feasible electrocatalyst for HER.

Research Area(s)

  • Electrocatalyst, Strain, DFT study, Barrier calculation, MXenes, HER

Citation Format(s)

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