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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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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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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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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Author Spotlight: Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
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Microfluidic electrochemistry for single-electron transfer redox-neutral reactions.

Yiming Mo1, Zhaohong Lu2, Girish Rughoobur3

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

Science (New York, N.Y.)
|June 20, 2020
PubMed
Summary

This study introduces microfluidic redox-neutral electrochemistry (μRN-eChem), a cost-effective method for single-electron transfer (SET) reactions. This electrochemistry platform enables diverse SET chemistries and practical electrosynthesis.

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Area of Science:

  • Organic Chemistry
  • Electrochemistry
  • Chemical Engineering

Background:

  • Visible-light photocatalysis enables single-electron transfer (SET) redox-neutral chemistries.
  • Photocatalysis often requires expensive photocatalysts.
  • Electrochemistry presents an alternative for SET reactions without costly catalysts.

Purpose of the Study:

  • Introduce a microfluidic redox-neutral electrochemistry (μRN-eChem) platform.
  • Demonstrate the broad applicability of μRN-eChem to various SET reactions.
  • Showcase the practicality of μRN-eChem for large-scale synthesis.

Main Methods:

  • Developed a microfluidic platform for simultaneous generation of reactive intermediates at the cathode and anode.
  • Utilized rapid molecular diffusion in microfluidic channels to enhance selective transformation.
  • Applied μRN-eChem to radical-radical cross-coupling, Minisci-type reactions, and nickel-catalyzed C(sp2)-O cross-coupling.

Main Results:

  • The μRN-eChem platform demonstrated broad applicability to diverse SET chemistries.
  • Selective transformation of intermediates was facilitated by microfluidic diffusion.
  • A two-step, gram-scale electrosynthesis of a liquid crystal compound was successfully achieved.

Conclusions:

  • Microfluidic redox-neutral electrochemistry (μRN-eChem) provides a versatile and cost-effective alternative to photocatalysis for SET reactions.
  • The μRN-eChem platform enables efficient synthesis of complex molecules.
  • This technology holds significant potential for practical electrosynthesis.