Co─N─C单原子站点的工程不对称电子结构朝着优秀的电化学H2O2生产和生物质升级
Kun Yu1, Shiming Guan1, Wenbiao Zhang2
1Jinan University, Department of Chemistry, No. 601 Huangpu West Avenue, Guangzhou, CHINA.
Angewandte Chemie (International ed. in English)
|February 27, 2025
概括
研究人员开发了一种不对称的Co─N5单原子位点催化剂,用于高效的电化学过氧化 (H2O2) 生产. 这一突破克服了活动选择性的权衡,使可持续的生物质利用和高产的酸合成成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 单原子M-N-C电催化剂的精确结构控制对于推进电化学H2O2生产和理解催化机制至关重要.
- 现有的催化剂在产生H2O2时面临着活性和选择性之间的权衡.
研究的目的:
- 构建一个不对称的Co-N5位点电催化剂,以增强两电子氧降解反应 (2e-ORR) 以获得高效的H2O2生产.
- 调查不对称电子配置对O2激活和中间吸附的影响.
主要方法:
- 合成具有不对称电子配置的Co─N5单原子位点.
- 实验和理论分析 (包括DFT计算) 来研究反应机制.
- 在流量单元中进行电化学测试,用于测量H2O2生产速度.
- 将2e− ORR与生物质衍生碳水化合物氧化进行合,用于酸合成.
主要成果:
- 与对称的Co-N4位点相比,不对称的Co-N5位点显著提高了2e-ORR.
- 断裂点对称性促进了O2激活和调节了*OOH中间吸附,破坏了线性缩放关系.
- 实现了高的H2O2生产率,为16.1 mol gcat−1 h−1.1.
- 通过合反应证明了高酸产量 (84.1%来自葡萄糖,62.0%-92.1%来自其他基质).
结论:
- 单原子位点的不对称性与高效的2e-ORR和H2O2生产密切相关.
- 开发的Co-N5催化剂为可持续的电合成和生物质利用提供了一个有希望的途径.
- 这项工作为设计各种化学转换的高性能电催化剂提供了基本的见解.
更多相关视频
10:57Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
18.1K
08:40Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
3.5K
相关概念视频
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.2K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.2K
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
03:00Electrolysis
25.9K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
25.9K