Enhancement effects of Fe-doped Ni3S2 on efficient electrochemical urea oxidation and mechanism insights
Journal of Alloys and Compounds(2023)
摘要
The urea oxidation reaction (UOR) can reduce the energy consumption of electrolytic for urea-assisted water splitting to produce hydrogen. Fe(EDTA)-Ni3S2 @NF electrode is prepared by a simple one-step hydrothermal method. The addition of EDTA promotes more Fe atoms doping into Ni3S2. Fe doping regulated the morphology and electronic structure of Ni3S2, and the Fe(EDTA)-Ni3S2 @NF shows excellent UOR activity. The required UOR potentials on Fe(EDTA)-Ni3S2 @NF at 50 mA cm−2 is 1.363 V (vs. RHE). In addition, the kinetics experiments and DFT calculations of the electrode toward UOR are carried out. It is found that UOR reactions under high current density (760 mA cm−2) would be limited. The liquid product of NO2- were detected by ion chromatography for UOR on Fe(EDTA)-Ni3S2 @NF. The faradaic efficiency for the electrooxidation of CO2NH4 to NO2- is 38 %. These findings provide complementary insights for the UOR in water-energy nexus systems.
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关键词
efficient electrochemical urea oxidation,ni3s2,fe-doped
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