Ce3+/Ce4+ 离子还氧化穿稳定Cuδ+ 为了高效的CO2 电还原到C2H4
Xiang Liu1,2, Ting Liu2, Ting Ouyang2
1Key Laboratory of Beijing on Regional Air Pollution Control, Beijing Key Laboratory for Green Catalysis and Separation, Center of Excellence for Environmental Safety and Biological Effects, Beijing University of Technology, Beijing, 100124, China.
Angewandte Chemie (International ed. in English)
|November 26, 2024
概括
一个新的 (Ce) 兴奋剂策略稳定了铜 (Cu) 活性位点,以有效地减少二氧化碳电解 (CO2RR). 这种方法提高了多碳产品的选择性,为清洁碳转化提供了一个有前途的途径.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
背景情况:
- 二氧化碳电还原 (CO2RR) 提供了清洁的碳转化,但在效率和C2产品选择性方面存在困难.
- 动态Cuδ+状态有助于C-C合,但在恶劣的电催化条件下不稳定.
- 保持稳定的Cuδ+物种对于提高CO2RR性能至关重要.
研究的目的:
- 在CO2RR期间制定稳定Cuδ+状态的策略.
- 提高多碳产品在二氧化碳电减中的选择性和效率.
- 调查 (Ce) 兴奋剂在稳定活性铜物种中的作用.
主要方法:
- (Ce) 对氧化铜 (CuO) 的化,以创建一个Ce/CuO x催化剂.
- 现场红外光谱和现场X射线光电子光谱分析催化剂行为.
- 密度函数理论 (DFT) 计算以了解反应机制和能量障碍.
主要成果:
- Ce/CuO x催化剂在多碳产品 (C2H4,CH3CH2OH,CH3COOH) 中实现了60%的法拉达效率.
- 对C2H4的高选择性 (40%) 观察到在-1.2V与RHE相比,稳定时间为25小时.
- Ce注稳定了Cuδ+状态,形成了Ce-Cu氧化还原离子对,降低了*CO合能量屏障.
结论:
- 兴奋剂有效地稳定了Cuδ+活性位点,从而增强了二氧化碳的电还原.
- Ce/CuO x催化剂在C2产品的选择性和稳定性方面取得了显著的改进.
- 这项工作提出了一种新的方法,用于先进的催化和清洁能源应用.
相关概念视频
Redox Equilibria: Overview
530
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
530
Redox Reactions
55.5K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
55.5K
Electron Transport Chain: Complex III and IV
7.1K
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
7.1K
Oxidation-Reduction Reactions
64.3K
Oxidation–Reduction Reactions
64.3K
Electrolysis
26.0K
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...
26.0K
Redox Titration: Other Oxidizing and Reducing Agents
243
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
243


