Photocatalytic nitrogen fixation from air directly under sunlight can contribute significantly to carbon neutralization. It is an ideal pathway to replace the industrial Haber Bosch process in future. A Fe-doped layered WO$_3$ photocatalyst containing oxygen vacancies was developed which can fix nitrogen from air directly under sunlight at atmospheric pressure. The iron doping enhances the transport efficiency of photogenerated electrons. The photocatalytic efficiency is around 4 times higher than that of pure WO$_3$. The optimum nitrogen fixation conditions were examined by orthogonal experiments and its nitrogen fixation performance could reach up to 477 $\mu \text{g} \cdot \text{g}_{\text{cat}}^{-1} \cdot \text{h}^{-1}$ under sunlight. In addition, the process of nitrogen fixation was detected by situ infrared, which confirmed the reliability of nitrogen fixation. Also, modelling on the interactions between light and the photocatalyst was carried out to study the distribution of surface charge and validate the light absorption of the photocatalyst. This work provides a simple and cheap strategy for photocatalytic nitrogen fixation from air under mild conditions.

中文翻译：

---

铁掺杂WO$_3$在阳光下从空气中高效光催化固氮

直接在阳光下从空气中进行光催化固氮可以显着促进碳中和。这是未来替代工业哈伯博世工艺的理想途径。开发了一种含氧空位的Fe掺杂层状WO$_3$光催化剂，可以在大气压下直接在阳光下固定空气中的氮。铁掺杂提高了光生电子的传输效率。光催化效率是纯WO$_3$的4倍左右。通过正交实验研究了最佳固氮条件，其固氮性能可达477 $\mu \text{g} \cdot \text{g}_{\text{cat}}^{-1} \cdot \text{h}^{-1}$ 在阳光下。此外，通过原位红外检测固氮过程，这证实了固氮的可靠性。此外，还对光与光催化剂之间的相互作用进行了建模，以研究表面电荷的分布并验证光催化剂的光吸收。这项工作为在温和条件下从空气中进行光催化固氮提供了一种简单且廉价的策略。