双功能
电催化剂
析氧
阳极
无机化学
制氢
化学
催化作用
分解水
电解
化学工程
材料科学
电化学
电极
有机化学
电解质
物理化学
光催化
工程类
作者
Xin Jia,Hongjun Kang,Xiaoxuan Yang,Yunlong Li,Kai Cui,Xiaohong Wu,Wei Qin,Gang Wu
标识
DOI:10.1016/j.apcatb.2022.121389
摘要
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 OER catalyst. This work provides a novel strategy for synthesizing amorphous Ni(Ⅲ)-based sulfides nanosheets for bifunctional OER/UOR electrocatalysts, which is significant for efficient and stable hydrogen production by using urea-containing wastewater.
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