Surface oxygen vacancies (OVs) engineering has been widely adopted as an effective strategy to enhance photocatalytic performance. At present, photocatalytic systems capable of precisely regulating surface OVs concentrations, which could help illuminate the effects of the surface OVs concentration on N fixation activity, are still scarce. Herein, bismuth-based metal organic framework (Bi-MOF) was loaded onto the surface of BiMoO (BMO) as an operable platform, and the OVs concentration in the Bi-MOF component of BMO/Bi-MOF could be regulated by reduction of bismuth ions therein. Experimental results confirm that optimum construction of OVs in the Bi-MOF promotes the photoelectrons transfer from BMO to Bi-MOF, facilitating the activation of N at OVs. Consequently, the optimized catalyst shows superior performance in NH production, which reaches 125.78 μmol h g, 21.4 higher than that of BMO. This work underline the significance of regulating surface OVs concentration, providing inspiration for the development of efficient OVs-modified photocatalysts.

中文翻译：

---

调节 Bi2MoO6/Bi-MOF 表面氧空位浓度促进光催化氨合成

表面氧空位（OV）工程已被广泛采用作为增强光催化性能的有效策略。目前，能够精确调节表面OVs浓度的光催化系统仍然很少，这有助于阐明表面OVs浓度对固氮活性的影响。在此，将铋基金属有机骨架（Bi-MOF）负载到BiMoO（BMO）表面作为可操作平台，并且可以通过减少BMO/Bi-MOF的Bi-MOF组分中的OVs浓度来调节其中有铋离子。实验结果证实，Bi-MOF 中 OV 的最佳结构促进了光电子从 BMO 转移到 Bi-MOF，从而促进了 OV 中 N 的活化。因此，优化后的催化剂在NH生成方面表现出优异的性能，达到125.78 μmol h g，比BMO高21.4。这项工作强调了调节表面OVs浓度的重要性，为开发高效OVs修饰的光催化剂提供了灵感。