Traditionally, ammonia (NH₃) is synthesized via the Haber–Bosch process, which is not only commanded by harsh conditions but causes serious environmental pollution. Electrochemical reduction is recognized as a mild and environmentally benign alternative approach for NH₃ synthesis, but an efficient electrocatalyst is a prerequisite for NH₃ production. In this communication, the first experimental demonstration that Mn₃O₄ nanocubes can be used as an efficient non‐noble‐metal electrocatalyst for N₂ reduction reaction (NRR) at ambient conditions is reported. In 0.1 m Na₂SO₄ aqueous solution, the catalyst delivers excellent NRR activity with an NH₃ yield of 11.6 µg h⁻¹ mg⁻¹_cat. and Faradaic efficiency of 3.0% at −0.8 V versus reversible hydrogen electrode. Notably, this catalyst also possesses satisfactory durability during the electrolysis and recycling test.

中文翻译：

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Mn3O4纳米立方体：一种将人工N2固定在NH3上的高效电催化剂

传统上，氨（NH ₃）是通过哈伯-博世（Haber-Bosch）工艺合成的，该工艺不仅条件苛刻，而且会造成严重的环境污染。电化学还原被认为是合成NH ₃的温和且对环境无害的替代方法，但高效的电催化剂是NH ₃生产的前提。在此交流中，首次实验证明了Mn ₃ O ₄纳米立方体可以用作环境条件下N ₂还原反应（NRR）的有效非贵金属电催化剂。在0.1 m Na ₂ SO _4中在水溶液中，该催化剂具有出色的NRR活性，NH ₃收率为11.6 µg h ^-1 mg ^-1 _cat。与可逆氢电极相比，在-0.8 V时法拉第效率为3.0％。值得注意的是，该催化剂在电解和循环测试过程中还具有令人满意的耐久性。