A Petal-like Structured NiCuOOH-NF Electrode by a Sonochemical Combined with the Electrochemical Method for Ammonia Oxidation Reaction

Direct electrochemical oxidation, as an economical and efficient method, has recently received increasing attention for ammonia-nitrogen wastewater treatment. Developing a low-cost, catalytic electrode is the key to solve problem of sluggish ammonia oxidation reaction (AOR) kinetics. In this study, three-dimensional (3D) Ni foam coated with NiCuOOH petal-like cluster structures was prepared using simple sonochemical method combined surface reconstruction strategy. This structure large area abundant active sites, giving good premise extraordinary electrocatalytic activity AOR. The results show that maximum current density AOR reaches 97.8 mA cm−2 at 0.60 V vs. saturated calomel (SCE). Additionally, 96.53% NH4+-N removal efficiency 63.12% TN were acquired in electrolysis system based on NiCuOOH-NF electrode, well stability least 24 h. It promising flow-through anode clean treatment wastewater.