纳米片
尿素
电解
镍
材料科学
分解水
电化学
吉布斯自由能
无机化学
电催化剂
氢燃料
化学工程
热液循环
过渡金属
催化作用
氢
纳米技术
化学
电极
冶金
物理化学
电解质
热力学
有机化学
生物化学
工程类
物理
光催化
作者
Chang Liu,Fang Li,Song Xue,Haili Lin,Yi Sun,Jing Cao,Shifu Chen
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2021-12-27
卷期号:5 (1): 1183-1192
被引量:17
标识
DOI:10.1021/acsaem.1c03536
摘要
In environmental and energy aspects, it is important to study electrocatalytic urea splitting. Urea electrolysis has great prospects for wastewater treatment and purification, and is an efficient way to produce hydrogen energy. In this work, we fabricated the Fe-doped Ni3S2 nanosheet arrays on nickel foam through two-step facile hydrothermal method, and discovered that Fe doped Ni3S2 with Ni/Fe = 0.25:0.75 ((Ni0.25Fe0.75)3S2/NF) presented a highly efficient performance and durability for both hydrogen evolution reaction and urea oxidation reaction (UOR). More notably, (Ni0.25Fe0.75)3S2/NF only requires a voltage of 1.49 V at 10 mA cm–2 for overall urea splitting, and has excellent electrochemical stability for more than 100 h. The remarkable electrocatalytic activity can be ascribed to the Fe doping which modifies the coordination environment of Ni and optimizes the binding strength of UOR intermediates on Ni active sites. Furthermore, density functional theory calculation manifests that Fe-doped Ni3S2 exhibits higher intrinsic activity for lower Gibbs free energy in comparison with that of pristine Ni3S2. The present results demonstrate that nickel-based materials have great potential for urea electrolysis, providing significant insights into the preparation of nonexpensive transition metal electrocatalysts.
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