Industrially, NH₃ is mainly produced via the Haber–Bosch process which is not only energy-consuming but emits a large amount of CO₂. Electrochemical reduction is regarded as an environmentally-benign alternative for sustainable NH₃ synthesis, and its efficiency heavily depends on the identification of Earth-abundant catalysts with high activity for the N₂ reduction reaction (NRR). In this work, we report that a spinel Fe₃O₄ nanorod on a Ti mesh (Fe₃O₄/Ti) acts as an efficient and durable NRR electrocatalyst under ambient conditions. When tested in 0.1 M Na₂SO₄, such Fe₃O₄/Ti achieves a high faradaic efficiency of 2.6% and a NH₃ yield 5.6 × 10⁻¹¹ mol s⁻¹ cm⁻² and at −0.4 V vs. a reversible hydrogen electrode.

中文翻译：

---

尖晶石Fe ₃ O ₄纳米棒电 催化N ₂固定在NH _3上†

在工业上，NH ₃主要通过哈伯-博世（Haber-Bosch）工艺生产，该工艺不仅耗能，而且排放大量的CO ₂。电化学还原被认为是可持续合成NH _3的一种环境友好的替代方法，其效率在很大程度上取决于对N ₂还原反应（NRR）具有高活性的富含地球的催化剂的识别。在这项工作中，我们报告说，Ti网格上的尖晶石Fe ₃ O ₄纳米棒（Fe ₃ O ₄ / Ti）在环境条件下可作为一种高效且持久的NRR电催化剂。在0.1 M Na ₂ SO _{4中测试时}相对于可逆氢电极，这样的Fe ₃ O ₄ / Ti在-0.4 V时和-0.4 V时都具有2.6％的高法拉第效率和NH ₃产率5.6×10 ^-11 mol s ^-1 cm ^-2。