Photocatalytic fixation of nitrogen has been recognized as a green and promising strategy for ammonia synthesis under ambient conditions. However, the efficient reduction of nitrogen remains a challenge due to high activation energy of nitrogen and low utilization of solar energy. Herein, lanthanum oxyfluoride with different doping content of Pr³⁺ (LaOF:xPr³⁺) upconversion nanorods were synthesized by microwave hydrothermal method. Results indicated that the doping of Pr³⁺ generated considerable defects on the surface of LaOF which acted as the adsorption and activation center for nitrogen. Meanwhile, the Pr³⁺ ion narrowed the band gap and broadened the light response range of LaOF because LaOF:Pr³⁺ can upconvert visible light into ultraviolet light, which excite LaOF nanorods and improve the utilization of solar light. The doping amount of Pr³⁺ had critical effect on the photocatalytic nitrogen fixation performance which reached as high as 180 μmol·L⁻¹·ho¹ when the molar ratio of Pr³⁺ to LaOF was optimized to be 2%.

氮的光催化固定已被认为是在环境条件下合成氨的绿色和有前途的策略。然而，由于氮的高活化能和太阳能的低利用率，有效还原氮仍然是一个挑战。在此，通过微波水热法合成了不同掺杂含量的Pr ³⁺（LaOF：x Pr ³⁺）上转换纳米棒的氟氧化镧。结果表明，Pr ³⁺的掺杂在LaOF的表面产生大量的缺陷，这些缺陷是氮的吸附和活化中心。同时，由于LaOF：Pr ，Pr ³⁺离子缩小了带隙并扩大了LaOF的光响应范围。³⁺可以将可见光上转换为紫外光，从而激发LaOF纳米棒并提高太阳光的利用率。当将Pr ³⁺与LaOF的摩尔比优化为2％时，Pr ³⁺的掺杂量对光催化固氮性能具有至关重要的影响，其达到高达180μmol·L ^-1 ·ho ¹。