Amorphous Ni(Ⅲ)-based sulfides as bifunctional water and urea oxidation anode electrocatalysts for hydrogen generation from urea-containing water

作者：Jia Xin; Kang Hongjun; Yang Xiaoxuan; Li Yunlong; Cui Kai; Wu Xiaohong; Qin Wei; Wu Gang

来源：Applied Catalysis B: Environmental , 2022, 312: 121389.

DOI：10.1016/J.APCATB.2022.121389

• in situ
• electrochemical tuning
• Water electrolysis
• Oxygen evolution reaction
• Urea oxidation reaction

It is highly desired to design high-performance bifunctional electrocatalysts for an efficient oxygen evolution reaction (OER) and urea oxidation reaction (UOR) as anode water electrolysis reactions, which can be used for hydrogen production by using urea-containing water. Herein, a novel electrocatalyst composed of amorphous Ni(OH)S nanosheets was prepared by hydrolysis of NiCl2(CH3CSNH2)4 at room temperature. From spectroscopic characterization and density functional theory (DFT) calculations, the Ni(OH)S catalyst contains a Ni3+-rich phase, which can significantly accelerate the reaction kinetics. The anode electrocatalyst shows excellent OER activity, generating 10?mA?cm-2 with only 250?mV overpotentials. When employed as a UOR anode, it could reach 10?mA?cm-2 at 1.34?V, 140?mV lower than OER. Notably, the Ni(OH)S/NF anode exhibits decent bifunctional UOR and OER activities and presents the lowest overpotentials compared to a NiFe-PBA/NF UOR catalyst and a typical RuO2/NF ...

• 单位
  哈尔滨工业大学