Atmospheric nitrogen fixation using a photocatalytic system is a promising approach to produce ammonia. However, most of the recently explored photocatalysts for N₂ fixation are in the powder form, suffering from agglomeration and difficulty in the collection and leading to unsatisfactory conversion efficiency. Developing efficient film catalysts for N₂ photofixation under ambient conditions remains challenging. Herein, we report the efficient photofixation of N₂ over a periodic WS₂@TiO₂ nanoporous film, which is fabricated through a facile method that combines anodization, E-beam evaporation, and chemical vapor deposition (CVD). Oxygen vacancies are introduced into TiO₂ nanoporous films through Ar annealing treatment, which plays a vital role in N₂ adsorption and activation. The periodic WS₂@TiO₂ nanoporous film with an optimized WS₂ content shows highly efficient photocatalytic performance for N₂ fixation with an NH₃ evolution rate of 1.39 mmol g⁻¹ h⁻¹, representing one of the state-of-the-art catalysts.

中文翻译：

---

在周期性WS ₂ @TiO ₂纳米多孔膜上促进氮的光固定作用†

使用光催化系统在大气中固氮是一种有前途的生产氨的方法。然而，最近探索的用于N ₂固定的大多数光催化剂是粉末形式的，存在团聚和收集困难并且导致转化效率不令人满意的问题。在环境条件下开发用于N ₂光固定的有效膜催化剂仍然具有挑战性。在此，我们报告了通过周期性的WS ₂ @TiO ₂纳米多孔膜对N ₂的有效光固定，该膜是通过结合阳极氧化，电子束蒸发和化学气相沉积（CVD）的简便方法制造的。将氧空位引入TiO _2中纳米多孔膜通过Ar退火处理，在N _2的吸附和活化中起着至关重要的作用。具有最佳WS ₂含量的周期性WS ₂ @TiO ₂纳米多孔膜显示出对N ₂固定的高效光催化性能，NH ₃释放速率为1.39 mmol g ^-1 h ^-1，代表了其中一种状态。艺术催化剂。