催化作用
兴奋剂
尿素
层状双氢氧化物
碱金属
热液循环
电化学
材料科学
无机化学
化学工程
化学
物理化学
电极
有机化学
光电子学
工程类
作者
Ming Yang,Weihong Ge,Zirui Liu,Qiang Yue,Jun Zhang,Yanping Lv,Hao Wu
出处
期刊:Fuel
[Elsevier]
日期:2024-01-01
卷期号:356: 129626-129626
被引量:2
标识
DOI:10.1016/j.fuel.2023.129626
摘要
Urea oxidation reaction (UOR) with favorable thermodynamic potential provides a good application prospect in renewable energy infrastructure. However, the sluggish kinetics caused by 6e- transfer greatly hinders the usage of urea as fuel, efficient catalysts are urgently needed in consequence. In response, alkali-assisted Mo doped into Ni-Mn layered double hydroxides (Mo-NiMnLDH-OH) with laminate structure is synthesized via one-pot hydrothermal method. The alkali-assisted Mo doping contributes the modified morphology and microstructure, the tuned chemical states of Ni and Mn species, simultaneously generates defects and more active sites. The existence of alkali plays a vital role in promoting the Mo doping. Without alkali, the Mo doping should damage the laminate structure, and the chemical states of active sites cannot be efficiently tuned. When used as catalyst for UOR, the current density of 45.3 mA cm−2 and a specific current activity of 1132.8 mA cm−2 mg−1 for Mo-NiMnLDH-OH can be achieved at the potential of 1.623 V (vs. RHE), which is 4-fold higher than that for Ni-Mn layered double hydroxides without doping. Both indirect electrochemical and direct urea oxidation processes occur when using Mo-NiMnLDH-OH as catalyst, and the existence of Mo species will facilitate the occurrence of direct urea oxidation process. This work paves an effective way to synergistically engineer of Mo doping and defects into Ni-based layered double hydroxides for UOR.
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