氨
双原子分子
催化作用
电化学
选择性
色散(光学)
氮气
法拉第效率
化学
无机化学
材料科学
化学工程
电极
物理化学
有机化学
分子
工程类
物理
光学
作者
Hui Min Zhang,Hailong Wang,Luanqi Zhou,Qiming Li,Yang Xu,Yifei Wang,Meng Zhang,Zucheng Wu
标识
DOI:10.1016/j.apcatb.2023.122544
摘要
Direct electrochemical oxidation has recently received increasing attention in ammonia-nitrogen wastewater treatment. However, how to catalyze the oxidation of ammonia to N2 with high selectivity retains a tremendous challenge. In this work, NiCu3-N-C diatomic site catalyst (DAC) anchored in nitrogen-doped carbon was synthesized via solid-phase pyrolysis. HAADF-STEM and XAFS characterizations demonstrated the high dispersion of adjacent Ni/Cu diatomic sites and the micro-environment of Ni-N4/Cu-N4 groups. The experiment results exhibit that NiCu3-N-C DAC has an eminent intrinsic activity towards AOR with a TOF of 3.64 s−1 at 1.50 V vs. RHE. Consequently, in a real wastewater with 616 mg/L NH4+-N, 99.52% of removal efficiency and 86.60% of faradaic efficiency (FE) after a 6-hour degradation experiment were acquired with a high N2 selectivity of 97.87%, confirming its excellent catalytic performance. This work furnishes a good example of rationally designing functionally coordinated diatomic site catalysts (DACs) for the efficient treatment of ammonia-nitrogen wastewater.
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