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Balancing Redox Equations02:58

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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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Redox Reactions01:27

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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An acid-base reaction is one in which a hydrogen ion, H+, is transferred from one chemical species to another. Such reactions are of central importance to numerous natural and technological processes, ranging from the chemical transformations within cells or lakes and oceans to the industrial-scale production of fertilizers, pharmaceuticals, and other substances essential to the society.
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During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
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Bifunctional Near-Neutral Electrolyte Enhances Oxygen Evolution Reaction.

Kaiyue Zhao1, Yu Tao1, Linke Fu1

  • 1College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China.

Angewandte Chemie (International Ed. in English)
|August 21, 2023
PubMed
Summary
This summary is machine-generated.

The BF2(OH)2- anion in a mixed potassium borate/potassium fluoride electrolyte significantly boosts oxygen evolution reaction (OER) rates. This electrolyte engineering approach enhances catalyst performance at near-neutral pH.

Keywords:
Buffering CapacityFluoroborate SpeciesInterfacial WaterNear NeutralOxygen Evolution Reaction

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Electrocatalytic reaction performance is influenced by active site characteristics and the local electrolyte environment.
  • Optimizing the oxygen evolution reaction (OER) is crucial for energy conversion technologies.

Purpose of the Study:

  • To identify the key fluoroborate species enhancing OER in mixed KBi/KF electrolytes.
  • To elucidate the mechanisms by which this electrolyte promotes OER at near-neutral pH.

Main Methods:

  • Electrochemical kinetic studies
  • In situ spectroscopic investigations
  • Electrolyte analysis

Main Results:

  • BF2(OH)2- anion identified as the critical species for OER enhancement.
  • The mixed KBi/KF electrolyte stabilizes interfacial pH and activates interfacial water via hydrogen bonding.
  • Electrodeposited Co(OH)2 achieved 100 mA/cm2 at 1.74 V with the optimized electrolyte.

Conclusions:

  • The BF2(OH)2- anion plays a vital role in boosting OER activity.
  • Electrolyte engineering, specifically using mixed KBi/KF, is a promising strategy for improving OER performance.
  • This approach offers high activity with earth-abundant catalysts under near-neutral conditions.