期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 626, 期 -, 页码 445-452出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2022.06.173
关键词
Hydrogen; In situ electrochemical conversion; Mn-Ni(OH)(2); Nanorod arrays; Urea oxidation reaction
资金
- National Science Foundation of China [21905307, 31922057, 21801252]
- science and tech- nology innovation Program of Hunan Province [2021RC3103]
- Hunan Provincial Natural Science Foundation of China [2020JJ5964]
In this study, Mn-doped nickel hydroxide porous nanowire arrays were developed as efficient catalysts for urea oxidation reaction (UOR). By modulating the electronic structure and providing abundant spaces/channels, the Mn-Ni(OH)2 PNAs exhibited low potential and stable UOR performance.
Replacement of the sluggish anodic reaction in water electrocatalysis by a thermodynamically favorable urea oxidation reaction (UOR) offers the prospect of energy-saving H-2 generation, additionally mitigating urea-rich wastewater pollution, whereas the lack of highly efficient and earth-abundant UOR catalysts severely restricts widespread use of this catalytic system. Herein, Mn-doped nickel hydroxide porous nanowire arrays (denoted Mn-Ni(OH)(2) PNAs) are rationally developed and evaluated as efficient catalysts for the UOR in an alkaline solution via the in situ electrochemical conversion of NiMn-based metal-organic frameworks. Mn doping can modulate the electronic structural configuration of Ni(OH)(2) to significantly increase the electron density and optimize the energy barriers of the CO*/NH2* intermediates of the UOR. Meanwhile, porous nanowire arrays will afford abundant spaces/channels to facilitate active site exposure and electron/mass transfer. As a result, the Mn-Ni(OH)(2) PNAs delivered superior UOR performance with a small potential of 1.37 V vs. RHE at 50 mA cm(-2), a Tafel slope of 31 mV dec(-1), and robust stability. Notably, the overall urea electrolysis system coupled with a commercial Pt/C cathode demonstrated excellent activity (1.40 Vat 20 mA cm(-2)) and durability operation (only 1.40% decay after 48 h). (C) 2022 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据