Doping with exotic elements has become a general effective method for the synthesis of efficient nitrogen fixation photocatalyst. Wide bandgap semiconductors, thermodynamically, could be potential photocatalysts for nitrogen reduction reaction (NRR). In this study, we report an active photocatalyst of Fe doped SrWO4 from a facile solvothermal method. The band structure of SrWO4 can be regulated by varying the Fe doping concentration, and still fulfill the thermodynamical requirements of photocatalytic NRR. The doped samples also exhibit strong absorbance in visible light region. At optimal doping concentration, the photocatalyst shows significant enhancement of the ammonia production rate in ultrapure water compared to the pristine SrWO4. The results photoelectrochemical measurements and the photoluminescence spectra indicate that the enhancement of the performance is ascribed to the balanced defect states and optimized charge transfer. The present study opens a route toward the development of active photocatalysts with preferable thermodynamics for the fixation of atmospheric N2 employing solar light.

中文翻译：

---

具有可调能带结构的 Fe 掺杂 SrWO4 用于光催化固氮

掺杂外来元素已成为合成高效固氮光催化剂的通用有效方法。从热力学上讲，宽带隙半导体可能是氮还原反应 (NRR) 的潜在光催化剂。在这项研究中，我们报告了一种通过简便的溶剂热法制备的 Fe 掺杂 SrWO4 的活性光催化剂。SrWO4 的能带结构可以通过改变 Fe 掺杂浓度来调节，并且仍然满足光催化 NRR 的热力学要求。掺杂的样品在可见光区域也表现出强吸收。在最佳掺杂浓度下，与原始 SrWO4 相比，光催化剂在超纯水中的氨产率显着提高。结果光电化学测量和光致发光光谱表明性能的提高归因于平衡的缺陷态和优化的电荷转移。本研究为开发具有优选热力学特性的活性光催化剂开辟了一条途径，用于利用太阳光固定大气中的 N2。