A Metal Coordination Number Determined Catalytic Performance in Manganese Borides for Ambient Electrolysis of Nitrogen to Ammonia

Abstract A new strategy that can effectively increase the nitrogen reduction reaction performance of catalysts is proposed and verified by tuning the coordination number of metal atoms. It is found that the intrinsic activity of Mn atoms in the manganese borides (MnB x ) increases in tandem with their coordination number with B atoms. Electron‐deficient boron atoms are capable of accepting electrons from Mn atoms, which enhances the adsorption of N 2 on the Mn catalytic sites (*) and the hydrogenation of N 2 to form *NNH intermediates. Furthermore, the increase in coordination number reduces the charge density of Mn atoms at the Fermi level, which facilitates the desorption of ammonia from the catalyst…

• NN
  National Natural Science Foundation of China

  Awards: 52003163, 22105129, 52373266
• ST
  Science, Technology and Innovation Commission of Shenzhen Municipality

  Awards: 20200812112006001, KQTD20170810105439418
• BA
  Basic and Applied Basic Research Foundation of Guangdong Province

  Awards: 2022A1515010670, 2022A1515011048