Photocatalytic N₂ fixation involves a nitrogen reduction reaction on the surface of the photocatalyst to convert N₂ into ammonia. Currently, the adsorption of N₂ is the limiting step for the N₂ reduction reaction on the surface of the catalyst. Based on the concept of photocatalytic water splitting, the photocatalytic efficiency can be greatly enhanced by introducing a co-catalyst. In this report, we proposed a new strategy, namely, the loading of a NiS co-catalyst on CdS nanorods for photocatalytic N₂ fixation. Theoretical calculation results indicated that N₂ was effectively adsorbed onto the NiS/CdS surface. Temperature programmed desorption studies confirmed that the N₂ molecules preferred to adsorb onto the NiS/CdS surface. Linear sweep voltammetry results revealed that the overpotential of the N₂ reduction reaction was reduced by loading NiS. Furthermore, transient photocurrent and electrochemical impedance spectroscopy indicated that the charge separation was enhanced by introducing NiS. Photocatalytic N₂ fixation was carried out in the presence of the catalyst dispersed in water without any sacrificial agent. As a result, 1.0 wt% NiS/CdS achieved an ammonia production rate of 2.8 and 1.7 mg L⁻¹ for the first hour under full spectrum and visible light (λ > 420 nm), respectively. The catalyst demonstrated apparent quantum efficiencies of 0.76%, 0.39% and 0.09% at 420, 475 and 520 nm, respectively. This study provides a new method to promote the photocatalytic efficiency of N₂ fixation.

光催化N ₂固定涉及光催化剂表面上的氮还原反应以将N ₂转化为氨。目前，N 2 的吸附_是催化剂表面N ₂还原反应的限制步骤。基于光催化水分解的概念，通过引入助催化剂可以大大提高光催化效率。在本报告中，我们提出了一种新策略，即在 CdS 纳米棒上负载 NiS 助催化剂用于光催化 N ₂固定。理论计算结果表明，N ₂被有效地吸附到NiS/CdS表面。程序升温脱附研究证实，N_{2 个}分子优先吸附到 NiS/CdS 表面。线性扫描伏安法结果表明负载NiS降低了N ₂还原反应的过电位。此外，瞬态光电流和电化学阻抗谱表明，通过引入 NiS 可以增强电荷分离。在没有任何牺牲剂的情况下，在分散在水中的催化剂存在下进行光催化N _2固定。结果，1.0 wt% NiS/CdS在全光谱和可见光下第一个小时的氨产量分别为 2.8 和 1.7 mg L ^{-1 (} λ > 420 纳米），分别。该催化剂在 420、475 和 520 nm 处的表观量子效率分别为 0.76%、0.39% 和 0.09%。该研究为提高N ₂固定的光催化效率提供了一种新方法。