The N₂ photofixation presents a green and eco-friendly ammonia synthesis approach. However, present strategies for light-induced N₂ activation suffer from low efficiency and instability, largely hindering the development of this technology. Herein, we report the LaFeO₃ co-optimization of N₂ activation as well as subsequent photoinduced protonation with the further phosphate acid treatment. Efficient ammonia evolution rate reached 250 μmol g^–1 h^–1 over LaFeO₃ under simulated sunlight with appropriate acid treatment. The enhancement of phosphate modified samples was mainly attributed to the “pull and push” effect. The hydrogen bonding centers and transition metals (Fe) served as two separation active sites, which improves the adsorption and activation of dinitrogen. In addition, the facilitation of H₂O dissociation was also achieved after phosphate modification. These results suggested an alternative N₂ photofixation strategy of traditional organic and precious metallic additives for efficient ammonia synthesis.

中文翻译：

---

通过酸处理增强了LaFeO _3的氮光固性

N _2光固定技术提出了一种绿色环保的氨合成方法。但是，目前的光诱导N ₂活化策略效率低且不稳定，极大地阻碍了该技术的发展。在本文中，我们报告了LaFeO ₃对N ₂活化的共优化作用，以及随后用进一步的磷酸处理进行的光诱导质子化。与LaFeO _3相比，氨的有效析出速率达到250μmolg ^–1 h ^–1在模拟的阳光下，经过适当的酸处理。磷酸盐改性样品的增强主要归因于“推拉”效应。氢键合中心和过渡金属（Fe）充当两个分离活性位，从而提高了对二氮的吸附和活化。另外，在磷酸盐改性后也实现了H ₂ O离解的促进。这些结果提示了传统的有机和贵金属添加剂的另一种N ₂光固定策略，可以有效地合成氨。