一种多功能且简单的方法,用于校准两流量电池,用于差异化电化学质谱测量
Christoph J Bondue1, Marc T M Koper2, Kristina Tschulik1
1Faculty of Chemistry and Biochemistry, Laboratory of Electrochemistry & Nanoscale Materials, Ruhr-University Bochum, Universitätsstraße 150, 44780 Bochum, Germany.
ACS measurement science au
|August 21, 2023
概括
与双薄层电池相结合的微分电化学质谱 (DEMS) 需要校准. 一种新的两点方法使用分析物扩散系数来准确确定电化学反应的转移效率.
科学领域:
- 电化学 电化学 电化学
- 分析化学 分析化学
- 质谱测量质量谱测量
背景情况:
- 电化学反应产品的在线定量分析比离线方法具有优势.
- 微分电化学质谱法 (DEMS) 是一种流行的在线技术,具有高时间分辨率.
- DEMS通常与双薄层电池相结合,以管理真空电解质接口,但产品传输效率不完美.
研究的目的:
- 为应对在DEMS中校准双薄层电池的传输效率所面临的挑战.
- 开发一种多功能且易于使用的方法来确定各种分析物的转移效率.
- 提高对电化学反应产物的定量分析的准确性.
主要方法:
- 研究了双薄层细胞的转移效率与分析物的扩散系数之间的关系.
- 提出并验证了一种使用 (H2) 和氧 (O2) 作为校准标准的两点校准方法.
- 利用了传输效率和扩散系数的对数之间的线性相关性.
主要成果:
- 证明双薄层细胞转移效率取决于分析物的扩散系数.
- 建立了H2和O2转移效率的对数和它们的扩散系数的对数之间的线性关系.
- 表明,对这种线性关系的推断可以准确估计其他分析物的转移效率.
结论:
- 拟议的两点校准方法提供了一种多功能且简单的方法,可以使用DEMS量化电化学反应产品.
- 这种方法克服了对双薄层电池实验性确定校准常数的困难.
- 在各种实验条件下,H2和O2转移效率的可访问性使得这是一种广泛适用的技术.
相关概念视频
01:00Coulometry: Overview
1.6K
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...
1.6K
01:18Controlled-Current Coulometry: Coulometric Titration
204
Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...
204
01:06Interfacial Electrochemical Methods: Overview
285
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...
285
01:30Capillary Electrophoresis: Applications
434
Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
434
01:27Controlled-Current Coulometry: Overview
239
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...
239