【摘要】 氨在人类的生产生活中起着重要的作用,但目前工业上合成氨广泛采用的Haber-Bosch法耗能大,且污染严重。而N₂电还原反应（ENRR）被认为是一种有效的替代方法,由于N₂的键能较高,目前仍然缺乏高活性的催化剂。在这里,通过简单的浸渍法和氧化还原法制备了多价态的MnO_x/C催化剂,该催化剂具有较高的氮还原反应活性(氨产率达到7.8μg_NH3/(h·mg_cat),法拉第效率高达9.2%)。进一步研究表明,多价态MnO_x/C催化剂具有高氮还原反应活性的主要原因是不同价态的Mn离子(Mn²⁺、Mn³⁺、Mn⁴⁺)之间存在协同效应。更多还原

【Abstract】 NH₃ plays an important role in human production and life,but the main way to produce NH₃ is still the high energy consumption and high pollution Haber-Bosch process.Electrocatalytic N₂ reduction reaction （ENRR） is considered to be an effective alternative method,however highly efficient catalyst is still a challenging as a result of high bond energy of N■N.Here,we report an electrocatalyst of polyvalent MnO_x/C which is designed via simple redox reaction for highly efficient production of ammonia (with yield up to 7.8μg_NH3/(h·mg_cat) and Faradic efficiency （FE） up to 9.2%) from nitrogen reduction reaction （NRR）.The high NRR performance of polyvalent Mn O_x/C mainly originates from a synergistic effect among different valence states (Mn²⁺,Mn³⁺,Mn⁴⁺) of Mn for NRR.更多还原