脉冲电解通过抑制电解质泛滥促进了CO2的电还原到多碳产品
Jiayi Lin1, Kangyue Li1, Yao Ye1
1School of Chemistry and Chemical Engineering, In situ Center for Physical Sciences, Shanghai Electrochemical Energy Device Research Center (SEED), Shanghai Jiao Tong University, Shanghai, 200240, P.R. China.
Angewandte Chemie (International ed. in English)
|December 17, 2025
概括
气体扩散电极中的脉冲电化学二氧化碳减排 (p-CO2RR) 在高速率下显著提高了宝贵的多碳产品选择性. 这种方法通过管理电极来提高CO2RR效率.
科学领域:
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
- 转换可再生能源 转换可再生能源
背景情况:
- 电化学二氧化碳减排 (CO2RR) 对于将二氧化碳转化为燃料和化学品至关重要.
- 脉冲CO2RR (p-CO2RR) 旨在提高对多碳产品 (C2+) 的选择性.
- 由于复杂的GDE微环境,对工业速度的p-CO2RR的机制理解是有限的.
研究的目的:
- 在工业相关的电流密度下,研究GDE流电池中的p-CO2RR机制.
- 澄清脉冲运行中增强C2+选择性背后的驱动因素.
- 为工业p-CO2RR系统提供设计原则.
主要方法:
- 运行拉曼和紫外线可见光谱学以研究中间物种.
- 现场SEM-EDS映射用于分析电极表面形态和组成.
- 电化学毛细血管压力动态的数值模拟.
- 在高电流密度的气体扩散电极 (GDE) 流细胞实验中.
主要成果:
- 脉冲操作在电流密度>0.4 A cm-2.2时实现了82.7%的C2+法拉戴效率.
- Cu_xO形成对*CO中间覆盖面的影响最小,排除了作为主要驱动因素的氧化还原重组.
- 减少电解质透和改善CO2质量转移与更高的C2+选择性相关.
- 模拟证实脉冲电位调节可湿性,以防止电极泛滥.
结论:
- 电极泛滥和CO2质量转移是脉冲增强C2+选择性的关键因素.
- 水力动力学管理,而不仅仅是催化剂工程,对于工业的p-CO2RR至关重要.
- 脉冲稳定了GDE中的气液接口,提高了性能.
相关概念视频
Controlled-Current Coulometry: Overview
619
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...
619
Coagulation
1.2K
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
1.2K
Controlled-Potential Coulometry: Electrolytic Methods
637
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
The chosen potential...
637
Electrolysis
30.0K
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...
30.0K
Electrodeposition
1.2K
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
1.2K
Colloidal precipitates
4.7K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
4.7K


