Solar-driven nitrogen fixation is a potential solution to satisfying industrial and agricultural demand, but is severely hampered by the difficulties in capturing, activating and cleaving the dinitrogen (N₂). Here, the defect TiO₂ nanobamboo arrays (DTiO₂ NBAs) is designed with an electro-reduction strategy, which, for the first time, successfully converted N₂ to ammonia (NH₃) in the visible and near infrared light range under ambient conditions, without any sacrificial agent or noble-metal co-catalysts. A highly selective NH₃ yield of 48.3 mg m⁻² h⁻¹ (178 μmol g⁻¹ h⁻¹, no N₂H₄ formation) is obtained on the DTiO₂ NBAs haired titanium foil. The apparent quantum efficiency (AQE) was measured to be 0.39% at 365 nm, 0.12% at 405 nm, 0.11% at 450 nm, 0.15% at 532 nm, 0.24% at 650 nm, and 0.07% at 780 nm. It is found that the electro-reduction process creates amorphous surface layer with modest oxygen vacancy (O_vac) density so as to greatly enhance light harvesting, charge carrier, photo-thermal effect, as well as nitrogen adsorption and hydrogenation activity. The alternating photo-fixation pathway is also confirmed by density functional theory (DFT) calculations. This novel nanobamboo TiO_x architecture shows a potential as a new artificial nitrogen fixation for environmentally friendly NH₃ production.

太阳能驱动的固氮技术是满足工业和农业需求的潜在解决方案，但由于捕获，活化和裂解二氮（N ₂）的困难而受到严重阻碍。在这里，缺陷TiO ₂纳米竹纤维阵列（DTiO ₂ NBAs）采用电还原策略设计，该策略首次在环境条件下在可见光和近红外光范围内成功地将N ₂转化为氨（NH ₃）。 ，没有任何牺牲剂或贵金属助催化剂。NH ₃的高选择性产率为48.3 mg m ^-2  h ^-1（178μmolg ^-1  h ^-1，无N₂ H ₄生成）是在DTiO ₂ NBAs的有毛钛箔上获得的。表观量子效率（AQE）在365 nm下测量为0.39％，在405 nm下为0.12％，在450 nm下为0.11％，在532 nm下为0.15％，在650 nm下为0.24％，在780 nm下为0.07％。发现电还原过程产生具有适度的氧空位（O _vac）密度的非晶态表面层，从而极大地增强了光收集，电荷载流子，光热效应以及氮吸附和氢化活性。交替的光固定路径也通过密度泛函理论（DFT）计算得到证实。这种新颖的纳米竹TiO _x结构显示出作为环保NH的新型人工固氮剂的潜力₃生产。