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Coulometry: Overview01:00

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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...
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Controlled-Potential Coulometry: Electrolytic Methods01:17

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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...
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Controlled-Current Coulometry: Coulometric Titration01:18

Controlled-Current Coulometry: Coulometric Titration

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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...
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Controlled-Current Coulometry: Overview01:27

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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...
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Voltammetry: Factors Affecting Measurements01:21

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A current produced due to the redox reactions of the analyte at the working and auxiliary electrodes is called a faradaic current. The reaction can be divided into two types. The current generated due to the reduction of the analyte is called cathodic current, and it carries a positive charge. In contrast, the current produced by analyte oxidation is known as an anodic current, and it has a negative charge. The applied potential at the working electrode determines the faradaic current flow, and...
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Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
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Cuantificación de las pérdidas de capacidad estática en compuestos de baterías de estado sólido mediante comparación

Kilian Vettori1, Maximilian Kissel1, Daniel Wagner1

  • 1Institute of Physical Chemistry & Center for Materials Research (ZfM/LaMa), Justus-Liebig-University Giessen, Heinrich-Buff-Ring 17, 35392, Giessen, Germany. kilian.vettori@uni-giessen.de.

Chemical communications (Cambridge, England)
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Resumen

Este estudio presenta un método electroquímico para medir la utilización estática del material catódico activo (MCA) en baterías de estado sólido. La comparación de los resultados con la difracción de rayos X valida esta nueva técnica in situ para el análisis de materiales de baterías.

Palabras clave:
baterías de estado sólidomaterial catódico activoutilización de material activotitulación coulométricadifracción de rayos Xmétodo in situ

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Área de la Ciencia:

  • Electroquímica
  • Ciencia de los materiales
  • Baterías de estado sólido

Sus antecedentes:

  • La cuantificación precisa de la masa electroquímicamente activa es crucial para el rendimiento de las baterías de estado sólido.
  • Los métodos ex situ existentes para evaluar la utilización del material catódico activo (MCA) pueden consumir mucho tiempo y no reflejar las condiciones in situ.
  • El desarrollo de técnicas in situ fiables es esencial para optimizar el diseño de los cátodos compuestos.

Objetivo del estudio:

  • Presentar un novedoso método electroquímico para cuantificar la utilización estática del material catódico activo (MCA).
  • Determinar la fracción de masa electroquímicamente activa dentro de los cátodos compuestos de baterías de estado sólido.
  • Comparar la eficacia del método in situ propuesto con técnicas ex situ establecidas.

Principales métodos:

  • Cuantificación electroquímica mediante curvas de titulación coulométrica.
  • Comparación del comportamiento del MCA en celdas con electrolitos tanto sólidos como líquidos.
  • Contraste de los resultados con análisis ex situ que emplean difracción de rayos X.

Principales resultados:

  • El método electroquímico cuantifica con éxito la utilización estática del MCA in situ.
  • Las curvas de titulación coulométrica proporcionan una medida fiable de la fracción de material activo.
  • Los resultados obtenidos mediante el método electroquímico muestran una buena concordancia con el análisis de difracción de rayos X ex situ.

Conclusiones:

  • El enfoque electroquímico desarrollado ofrece una alternativa viable para la evaluación in situ de la utilización del MCA.
  • Este método mejora la comprensión del comportamiento del material catódico en baterías de estado sólido.
  • La técnica facilita una caracterización y optimización más precisas de los componentes de la batería.