电催化剂
制氢
尿素
纳米片
电解
阳极
催化作用
化学工程
材料科学
电解质
无机化学
分解水
化学
电化学
电极
纳米技术
有机化学
光催化
工程类
物理化学
作者
Yongxing Diao,Yaosheng Liu,Guangxing Hu,Yuyan Zhao,Yuhong Qian,Hongda Wang,Yan Shi,Zhuang Li
标识
DOI:10.1016/j.bios.2022.114380
摘要
The preparation of high-performance electrocatalysts is a breakthrough to solve the increasingly prominent problems of environmental degradation and energy depletion. Urea oxidation reaction (UOR) plays a vital role in treating urea-rich wastewater and assisting hydrogen production with low energy consumption. To alleviate the sluggish intrinsic reaction kinetic barrier of six-electron transfer involved in UOR, we develop a NiFe ultra-thin two-dimensional nanosheet array supported on nickel foam as UOR electrocatalyst by one-step hydrothermal method. Benefiting from the in-situ synthesis strategy, abundant mesoporous structure, and the electronic structure change of Ni after the introduction of Fe, NiFe nanosheets (NiFe NSs) exhibit remarkable UOR catalytic activity and excellent long-term stability. Moreover, we assemble a two-electrode electrolytic cell with NiFe NSs/NF as the anode. The results show that the cell voltage of urea assisted water electrolysis for hydrogen production decreased by 15.2% rather than the regular water splitting, as well as that the urea concentration in electrolyte is degraded 55.6% after electrolysis for 36 h at 1.70 V. This work indicates a feasibility verification for the electrocatalytic removal of urea in wastewater treatment, and an efficient and energy-saving method for urea-assisted electrolytic hydrogen production based on NiFe nanosheets.
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