Two-dimensional MXene-based materials are potential of presenting unique catalytic performances of electrocatalytic reactions. The surface functionalization of MXene-based catalysts is attractive for developing efficient electrocatalysts toward nitrogen reduction reaction. Herein, we reported a Ti3C2Tx MXene with a medium density of surface functionalized fluorine terminal groups, as an excellent N2 reduction reaction electrocatalyst with enhanced adsorption and activation of N2. The Ti3C2Tx MXene catalyst showed a production rate of ammonia as 2.81 × 10–5 μmol·s−1·cm−2, corresponding to a partial current density of 18.3 μA·cm−2 and a Faradic efficiency of 7.4% at − 0.7 V versus reversible hydrogen electrode in aqueous solutions at ambient conditions, substantially exceeding similar Ti3C2Tx MXene catalysts but with higher or lower densities of surface fluorine terminal groups. Our work suggests the capability of developing surface functionalization toolkit for enhancing electrochemical catalytic activities of two-dimensional MXene-based materials.

中文翻译：

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通过以氟为末端的Ti ₃ C ₂ T _x MXene促进N ₂电还原为氨

二维基于MXene的材料具有呈现电催化反应独特的催化性能的潜力。MXene基催化剂的表面官能化对于开发高效的氮还原反应电催化剂具有吸引力。在本文中，我们报道了具有中等密度的表面官能化氟端基的Ti3C2Tx MXene，它是一种出色的N2还原反应电催化剂，具有增强的N2吸附和活化作用。Ti3C2Tx MXene催化剂的氨生成率为2.81×10–5μmol·s-1·cm-2，对应于-0.7 V的部分电流密度为18.3μA·cm-2，法拉第效率为7.4％与在环境条件下在水溶液中使用可逆氢电极相比，基本上超过了类似的Ti3C2Tx MXene催化剂，但表面氟端基的密度更高或更低。我们的工作表明开发表面功能化工具包以增强二维基于MXene的材料的电化学催化活性的能力。