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Related Concept Videos

Supercritical Fluid Chromatography01:18

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Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
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Electrochemical Systems01:24

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Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution,...
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Electrochemistry: Overview01:04

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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,...
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Interfacial Electrochemical Methods: Overview01:06

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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...
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Theory of Strong Electrolytes01:23

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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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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.
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Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials
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Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials

Published on: May 15, 2015

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Electrochemistry in supercritical fluids.

Jack A Branch1, Philip N Bartlett2

  • 1Department of Chemistry, University of Southampton, Southampton SO17 1BJ, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|November 18, 2015
PubMed
Summary
This summary is machine-generated.

Supercritical fluids enable well-resolved electrochemistry, including voltammetry and metal electrodeposition. Metallocenes serve as reliable redox standards in supercritical carbon dioxide and hydrofluorocarbons.

Keywords:
electrochemistryelectrodepositionmetallocenesupercritical fluid

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Area of Science:

  • Electrochemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Supercritical fluids (SCFs) offer unique solvent properties for electrochemical applications.
  • Carbon dioxide (CO2) and hydrofluorocarbons (HFCs) are prominent SCF solvents.
  • Achieving well-resolved electrochemistry in SCFs requires careful optimization of conditions and electrolytes.

Purpose of the Study:

  • To review electrochemical studies conducted in supercritical fluids.
  • To highlight advances in voltammetry, capacitance, and electrodeposition within SCFs.
  • To discuss the utility of metallocenes as redox probes in SCF systems.

Main Methods:

  • Voltammetric analysis in various SCFs.
  • Double-layer capacitance measurements.
  • Electrodeposition of metals into nanoporous structures.
  • Utilizing metallocenes as electrochemical standards.

Main Results:

  • Well-resolved voltammetry is achievable in SCFs under optimized conditions.
  • SCFs can be effectively used for electrochemical studies, including capacitance and deposition.
  • Metallocenes demonstrate suitability as redox probes and standards in SCF electrochemistry.

Conclusions:

  • Supercritical fluid electrochemistry is a developing field with significant potential.
  • Careful selection of SCFs, electrolytes, and conditions is crucial for successful electrochemical experiments.
  • Metallocene redox probes offer a valuable tool for electrochemical measurements in SCFs.