Modulation of dual centers on cobalt-molybdenum oxides featuring synergistic effect of intermediate activation and radical mediator for electrocatalytic urea splitting
文献类型：期刊论文
| 作者 | Zhang, Kai ; Liu, Chunlei; Graham, Nigel; Zhang, Gong; Yu, Wenzheng
|
| 刊名 | NANO ENERGY
 |
| 出版日期 | 2021-09 |
| 卷号 | 87页码:- |
| ISSN号 | 2211-2855 |
| 关键词 | Cobalt-molybdenum oxide Synergistic effect Hydrogen evolution reaction Urea oxidation reaction Electrocatalysis |
| 英文摘要 | Construction of dual sites to break adsorption-energy scaling limitations offers an effective means of facilitating urea electrolysis for H-2 production, but a fundamental understanding of their synergistic mechanisms remains incomplete. Herein, we report a facile H-2 vapor-assisted strategy for the controllable fabrication of the bimetallic active Co2Mo3O8 electrocatalyst for alkaline urea splitting, with an applied voltage of only 1.50 V required to deliver 50 mA cm(-2). Direct spectroscopic evidence and theoretical investigation demonstrate that the Co sites are responsible for the activation of intermediates, whereas the assisting Mo centers are identified as the OH or H radical mediators. Specifically, the synergistic effect of the Co-Mo dual sites was conclusively verified by the insitu Raman and X-ray photoelectron spectroscopy. Theoretical calculations reveal that the short H-bonding (MoHO center dot center dot center dot H-NamineCO-Co) and Co-C-N-Mo configuration formed at the Co-Mo bridge are the key features determining a high reactivity for urea oxidation. The accelerated reaction rate is attributable to the conversion of the endoergic CO2 desorption to an exoergic reaction. In an alkaline H-2 evolution, Co atoms are the reaction sites for O-H bond cleavage of H2O, while Mo sites are considered to be the H-2-evolving centers. Determination of the individual functionality of synergistic dual centers represents a critical step towards the rational design of highlyefficient electrocatalysts. |
| WOS研究方向 | Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Physics, Applied |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45965]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China 3.Tsinghua Univ, Ctr Water & Ecol, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China 4.Imperial Coll London, Dept Civil & Environm Engn, South Kensington Campus, London SW7 2AZ, England |
| 推荐引用方式 GB/T 7714 | Zhang, Kai,Liu, Chunlei,Graham, Nigel,et al. Modulation of dual centers on cobalt-molybdenum oxides featuring synergistic effect of intermediate activation and radical mediator for electrocatalytic urea splitting[J]. NANO ENERGY,2021,87:-. |
| APA | Zhang, Kai,Liu, Chunlei,Graham, Nigel,Zhang, Gong,&Yu, Wenzheng.(2021).Modulation of dual centers on cobalt-molybdenum oxides featuring synergistic effect of intermediate activation and radical mediator for electrocatalytic urea splitting.NANO ENERGY,87,-. |
| MLA | Zhang, Kai,et al."Modulation of dual centers on cobalt-molybdenum oxides featuring synergistic effect of intermediate activation and radical mediator for electrocatalytic urea splitting".NANO ENERGY 87(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。