Electronic structure modulation of nickel hydroxide porous nanowire arrays via manganese doping for urea-assisted energy-efficient hydrogen generation

被引：0

作者：

Chen, Fan ^{[1
]}

Yang, Fan ^{[2
]}

Sheng, Can ^{[1
]}

Li, JiaZhou ^{[1
]}

Xu, Han ^{[1
]}

Qing, Yan ^{[1
]}

Chen, Sha ^{[1
]}

Wu, Yiqiang ^{[1
]}

Lu, Xihong ^{[2
]}

机构：

[1] Hunan Province Key Laboratory of Materials, Surface/Interface Science & Technology, Central South University of Forestry and Technology, Changsha,410004, China

[2] MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, The Key Lab of Low-Carbon Chem & Energy Conservation of Guangdong Province, School of Chemistry, Sun Yat-Sen University, Guangzhou,510275, China

来源：

Journal of Colloid and Interface Science | 2022年 / 626卷

基金：

中国国家自然科学基金;

关键词：

Anodic oxidation - Catalysts - Electrocatalysis - Electronic structure - Energy efficiency - Hydrogen production - Manganese compounds - Metabolism - Nanorods - Nanowires - Nickel compounds - Slope stability - Water pollution;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Replacement of the sluggish anodic reaction in water electrocatalysis by a thermodynamically favorable urea oxidation reaction (UOR) offers the prospect of energy-saving H2 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 V at 20 mA cm−2) and durability operation (only 1.40% decay after 48 h). © 2022 Elsevier Inc.

引用

页码：445 / 452