The fabrication of efficient catalysts to reduce nitrogen (N₂) to ammonia (NH₃) is a significant challenge for artificial N₂ fixation under mild conditions. In this work, we demonstrated that the simultaneous introduction of oxygen vacancies (OVs) and Mo dopants into Bi₅O₇Br nanosheets can significantly increase the activity for photocatalytic N₂ fixation. The 1 mol% Mo-doped Bi₅O₇Br nanosheets exhibited an optimal NH₃ generation rate of 122.9 μmol g⁻¹ h⁻¹ and durable stability, which is attributed to their optimized conduction band position, suitable absorption edge, large number of light-switchable OVs, and improved charge carrier separation. This work provides a promising approach to design photocatalysts with light-switchable OVs for N₂ reduction to NH₃ under mild conditions, highlighting the wide application scope of nanostructured BiOBr-based photocatalysts as effective N₂ fixation systems.

制造将氮 (N ₂ )还原为氨 (NH ₃ )的有效催化剂是温和条件下人工 N ₂固定的重大挑战。在这项工作中，我们证明了将氧空位 (OVs) 和 Mo 掺杂剂同时引入 Bi ₅ O ₇ Br 纳米片可以显着提高光催化 N ₂固定的活性。1 mol% Mo掺杂的Bi ₅ O ₇ Br纳米片表现出最佳NH ₃生成率为122.9 μmol g ^-1 h ^-1和持久的稳定性，这归因于它们优化的导带位置、合适的吸收边缘、大量的光可切换 OV 和改进的电荷载流子分离。这项工作提供了一种有前途的方法来设计具有光可切换 OV 的光催化剂，用于在温和条件下将N ₂还原为 NH ₃，突出了基于纳米结构的 BiOBr 光催化剂作为有效的 N ₂固定系统的广泛应用范围。