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MXene Anion Engineering for Efficient Hydrogen Evolution
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DOI：10.1021/acssuschemeng.3c02771.png)
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Abstract
En 中文
A tunable anion-incorporated MXene hasbeen fabricated forefficient hydrogen evolution reaction activity. MXenes have attracted attention as promising electrocatalystsforperforming the hydrogen evolution reaction (HER). However, the poorintrinsic kinetics and inadequate density of active sites restrictMXenes as viable electrocatalysts for efficient hydrogen production.Herein, these hindrances are overcome via tunable doping of anionatoms as electron donors in titanium carbide (Ti3C2T X ) MXenes. By engineering theco-doping of nitrogen and sulfur anions, we achieve efficient electrocatalyticactivity through synergistic chemical and structural changes. Themodified MXene offers an optimal concentration of Ti-S andTi-N bonds at the surface of hexagonal nanoplate-decoratednanosheets, resulting in a low overpotential of 260 mV and a Tafelslope of 85 mV/dec in an acidic medium, which is improved 3xover that of the pristine MXene (overpotential of 770 mV). This modifiedTi(3)C(2)T( X ) catalystalso displays superior durability compared with other earth-abundantcatalysts, showing an operation for 60 h of continuous hydrogen evolutionwithout any decay in its performance. The enhanced electrocatalyticactivity of anion-co-doped Ti3C2T X MXene is attributed to manipulation of the electronicstructure through synergistic N and S bonding, which promotes balancedadsorption/desorption of the intermediate hydrogen H* by loweringthe Gibbs free energy (& UDelta;G (H*) = -0.07eV). Our strategy to improve the electrocatalytic activity of Ti3C2T X by anion engineeringhas the potential to enhance the electrocatalytic activity of numerousMXenes as well as other high surface area 2D materials.
Keywords:
MXene
noble metal-free
nonmetallic
anion doping
hydrogen evolution reaction
Journal
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7.3
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1.7W
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10.7W