相关实验视频
Updated: Jul 17, 2025

05:03
Precise Electrochemical Sizing of Individual Electro-Inactive Particles
Published on: August 4, 2023
1.3K
电化学动力学统一量子理论通过合的离子-电子转移
1Department of Chemical Engineering and Department of Mathematics, Massachusetts Institute of Technology, Cambridge 02139, MA, USA. bazant@mit.edu.
Faraday discussions
|September 7, 2023
概括
一个新的理论统一了电子转移和离子转移动力学,解释了电化学反应. 它根据能量极限预测了不同的行为,并提供了对光谱学和电池性能的见解.
科学领域:
- 物理化学 物理化学
- 电化学 电化学 电化学
- 量子力学就是量子力学.
背景情况:
- 像马库斯和巴特勒-沃尔默动力学这样的现有模型分别描述电子转移 (ET) 和离子转移 (IT).
- 需要一个统一的理论来准确地建模合离子电子转移 (CIET) 过程.
研究的目的:
- 介绍合离子电子转移 (CIET) 的一般理论,将马库斯和巴特勒-沃尔默动力学统一起来.
- 探索CIET在不同能源系统中的理论预测及其对电化学现象的影响.
主要方法:
- 开发CIET的一般理论,统一马库斯 (ET) 和巴特勒-沃尔默 (IT) 动力学.
- 在限制情况下 (ECIT和ICET) 导出关闭形式的非对称近似率表达式.
- 将CIET理论应用于铁酸盐 (LFP) 中的间.
主要成果:
- 该理论预测了电子合离子转移 (ECIT) 的马库斯动力学和离子合电子转移 (ICET) 的巴特勒-沃尔默动力学.
- 在 ICET 制度中,塔菲尔定律适用于与接口属性相关的广泛的超潜力.
- 该理论解释了XPS/AES中的光谱线形状,并预测了高超电位的金属电极的普遍反应有限电流.
结论:
- CIET理论为理解电化学反应提供了一个统一的框架,桥梁量子电化学和工程.
- 该理论成功地描述了间隔的实验观测,证明了其广泛的适用性.
- CIET为光谱数据提供了新的解释,并预测了电化学过程的基本限制.
更多相关视频
相关概念视频
Electrolysis
26.6K
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...
26.6K
Electrochemistry: Overview
2.1K
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,...
2.1K
Interfacial Electrochemical Methods: Overview
281
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...
281
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
Controlled-Potential Coulometry: Electrolytic Methods
202
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...
202
Coulometry: Overview
1.5K
Coulometry is one of the rapid, most accurate, and precise analytical techniques that determine the quantity of an analyte by measuring the electrical charge needed for its complete electrolysis without using any analytical standards. The total charge passed during electrolysis correlates with the analyte amount by Faraday's laws of electrolysis. For accurate coulometric measurements, a charge equal to Faraday's constant multiplied by the number of electrons involved in the relevant...
1.5K

