Modulation of the binding of the reactant or product species with catalysts is an effective approach to optimize the photocatalytic activity. Herein, we explored the relationship between the binding of reactant (N₂) and product (NH₃) with catalyst and the photocatalytic nitrogen fixation activity. The surface reactivity of nitrogen with water was tuned by introducing Co into the MXene@TiO₂ catalysts, which the TiO₂ nanoparticle derived from the in-situ growth on the surface of MXene nanosheets. Co modified adjusted the chemisorption equilibrium of the catalyst for reactant (N₂) and product (NH₃), thus promoted product desorption and efficiency of the active site. Remarkably, the optimal catalyst (MXene/TiO₂/Co-0.5%) exhibited outstanding NH₄⁺ production rate (110 μmol g⁻¹ h⁻¹) and excellent stability in pure water without any hole sacrificial agent under Ultraviolet–Visible (UV–vis) light in N₂ and air ambient.

调节反应物或产物种类与催化剂的结合是优化光催化活性的有效方法。在此，我们探索了反应物（N ₂）和产物（NH ₃）与催化剂的结合与光催化固氮活性之间的关系。通过将Co引入MXene @ TiO ₂催化剂，可调节氮与水的表面反应性，该催化剂是MXene纳米片表面上原位生长的TiO ₂纳米颗粒。共改性可调节催化剂对反应物（N ₂）和产物（NH ₃）的化学吸附平衡），从而促进了产物的解吸和活性位点的效率。值得注意的是，最佳的催化剂（MXene / TiO ₂ /Co-0.5%）表现出杰出的NH ₄ ⁺生产率（110μmolg ^-1 h ^-1）和在纯水中的优异稳定性，而在紫外-可见（UV）下没有任何空穴牺牲剂。 –vis）在N ₂和空气环境中点亮。