调节*CO对自我进化的行为调节 合催化剂 调节下 接口电场增强 CO2 电还原
Zining Zhang1, Xinyan Ma1, Yang Song1,2
1State Key Laboratory of Petroleum Molecular & Process Engineering, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062, China.
Angewandte Chemie (International ed. in English)
|August 19, 2025
概括
以铜为基础的催化剂具有自我演变的合结构,增强二氧化碳的电还原到多碳产品. 由于*CO吸附率优化和低能耗障碍,Ag/Cu催化剂具有高效率.
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:
- 用电化学方法将二氧化碳 (CO2) 减少为多碳 (C2+) 产品,对于可持续化学至关重要.
- 基于铜 (Cu) 的催化剂对二氧化碳的电还原具有前景,但控制选择性仍然是一个挑战.
- 串联或自我进化催化剂提供了一种调整中间吸附和反应通路的策略.
研究的目的:
- 研究界面电场在调节基于Cu的合催化剂*CO吸附和迁移中的作用.
- 设计和评估用于增强CO2电还原到C2+产品的新型自演变并列催化剂.
- 阐明控制二氧化碳电还原选择性的结构-活动关系.
主要方法:
- 密度函数理论 (DFT) 计算以建模在变化电场下的*CO吸附.
- 设计和合成三种自我进化的协同催化剂 (Ag/Cu,Pd/Cu,Au/Cu).
- 电化学二氧化碳减排测试,现场减弱的总反射红外和拉曼光谱,以及COMSOL多物理模拟.
主要成果:
- 接口电场强度显著影响Cu,Ag/Cu,Pd/Cu和Au/Cu模型上的*CO吸附.
- 由于*CO吸附弱,Au/Cu表现出高的CO选择性;由于高能量障碍,Pd/Cu表现出低的C2+选择性.
- Ag/Cu实现了高C2+法拉代效率 (FE_C2+) 89.2%和部分电流密度 (j_c2+) 553.9 mA cm−2,这是由于中度*CO吸附和低反应障碍.
- 接口电场对外部*CO迁移的影响微不足道,但增加了内部迁移的能源障碍.
结论:
- 自主演变的双重催化剂有效调节CO吸附和迁移以减少二氧化碳的电流.
- 由于*CO吸附和反应动力学的优化,Ag/Cu在C2+产物形成方面表现出卓越的性能.
- 虽然界面电场影响CO迁移,但在富含CO的微环境中增强的CO吸附是C-C合在合催化剂的关键.
相关概念视频
Thermal and Photochemical Electrocyclic Reactions: Overview
2.4K
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.
2.4K
Interfacial Electrochemical Methods: Overview
385
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current...
385
Thermal Electrocyclic Reactions: Stereochemistry
2.1K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.1K
Voltammetric Techniques: Cyclic Voltammetry
690
Cyclic voltammetry (CV) is an electrochemical technique used to investigate the redox properties of a chemical species. It involves measuring the current response of an electrochemical cell as a function of the applied potential. The setup for cyclic voltammetry typically consists of a working electrode, a reference electrode, and a counter electrode—all immersed in an electrolyte solution. The working electrode is where the redox reaction of interest occurs, while the reference electrode...
690
Controlled-Current Coulometry: Overview
300
Controlled current coulometry, also known as amperostatic coulometry, is a technique used in electrochemical analysis to measure the quantity of a substance through the controlled passage of current. It involves the application of a constant current to an electrochemical cell containing the analyte of interest. As the current flows through the cell, the analyte undergoes a redox reaction at the electrode surface, resulting in a charge transfer. By monitoring the time required for a certain...
300
Electrochemistry: Overview
2.2K
Electrochemistry is the branch of chemistry that studies the relationship between electrical quantities and chemical reactions, particularly oxidation and reduction. Oxidation is the loss of electrons from a substance, whereas reduction refers to the gain of electrons. A substance with a strong electron affinity is called an oxidizing agent (oxidant), and a reducing agent (reductant) is a species that donates electrons. Oxidation and reduction processes are pivotal to electrochemical reactions,...
2.2K


