钼
氨生产
二硫化钼
价(化学)
电化学
氨
法拉第效率
催化作用
化学计量学
无机化学
选择性
材料科学
产量(工程)
晶体结构
氮气
化学
物理化学
结晶学
电极
冶金
有机化学
作者
Guiming Peng,Jianwen Zhao,Jiaqi Wang,Eli Hoenig,Shuo Wu,Mingzhan Wang,Miao He,Lei Zhang,Jin‐Xun Liu,Chong Liu
标识
DOI:10.1016/j.apcatb.2023.123020
摘要
Rather than multivalence molybdenum (Mo), the low valence Mo has rarely been reported as active site for nitrogen reduction. Herein, molybdenum borides with various Mo-B stoichiometry ratios (Mo2B, α-MoB, and Mo2B4) in which Mo shows low valence (<1) are synthesized as electrochemical nitrogen reduction reaction (eNRR) catalysts. Mo2B4 demonstrates the highest NH3 yield of 7.65 µg h− 1/mg at − 0.15 V with Faradaic efficiency (FE) of 12.47 %, while α-MoB exhibits the fastest intrinsic eNRR reaction rate with a higher FE of 17.17 % after considering electrochemically active surface area. DFT calculations reveal that both enzymatic and consecutive mechanisms via side-on configuration can proceed on α-MoB. Additionally, α-MoB exhibits suppressed HER activity due to an optimal surface B occupancy. The eNRR of molybdenum borides were verified qualitatively and quantitatively by 15N2 isotope experiments. This study demonstrated a synergistic design of eNRR and HER activity to achieve efficient electrocatalytic ammonia production with high eNRR selectivity.
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