Electrochemical Intermediates
Electrochemical Intermediates - Related Videos
07:39
Electrochemical Biosensing
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2023
Electrochemical biosensors detect the binding of a target molecule by sensing an oxidation-reduction event. These sensors paved the way for modern biosensing after the invention of the glucose biosensor. This video will introduce electrochemical biosensing, show the workings of the glucose biosensor, and discuss how electrochemical biosensors are used in cancer detection.
08:59
Electrochemical Impedance Spectroscopy
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2023
Source: Kara Ingraham, Jared McCutchen, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT Electrical resistance is the ability of an electrical circuit element to resist the flow of electricity. Resistance is defined by Ohm's Law: (Equation 1) Where is the voltage and is the current. Ohm's law is useful for determining the resistance of ideal resistors. However, many circuit elements are more complex and can't be described by...
09:50
Electrochemically and Bioelectrochemically Induced Ammonium Recovery
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Cited by 31 •
2015
We demonstrate the extraction of ammonium from an ammonium-rich stream using an electrochemical and a bioelectrochemical system. The reactor setup, operation and data analysis are discussed.
07:32
Dynamic Electrochemical Measurement of Chloride Ions
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Cited by 5 •
2016
Dynamic measurement of chloride ions is presented. Transition time of an Ag/AgCl electrode, during a chronopotentiometric technique, can give the concentration of chloride ions in electrolyte. This method does not require a stable conventional reference electrode.
03:03
Developing a Bacterial Monolayer Biofilm Using an Electrochemical Reactor
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2026
Source: Tokunou, Y. et. al., Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1. J. Vis. Exp. (2018)This video demonstrates the assembly and operation of an electrochemical reactor model designed to simulate biofilm formation on electrode surfaces. Controlled electrochemical stimulation promotes microbial adhesion, leading to the gradual development of a bacterial monolayer biofilm.
FAQs
Electrode potential can redirect which intermediate forms and how long it persists. As the potential changes, a species may accept or release electrons in one or more steps, creating different pathways before the final product appears. This dependence lets chemists connect applied voltage with reaction rate and selectivity, rather than treating the overall reaction as a single event.
Solvent, electrolyte, and electrode surface interactions shape the intermediate's environment. They can influence whether an electron-transfer step proceeds, whether a species remains near the electrode, and whether it adsorbs before conversion. Considering these variables is essential because the same starting substance can follow different electrochemical pathways, affecting product formation and energy efficiency.
Sequential electron transfer and proton-coupled electron transfer represent different routes through the reaction sequence. In the first, electron movement occurs through successive transfer events; in the second, proton movement is coupled to electron transfer. Distinguishing them helps explain why a final product forms through particular intermediates and clarifies the molecular mechanism behind the observed reaction.
Adsorption can make an intermediate more than a freely moving solution species. When it binds to the electrode surface, that interaction becomes part of the pathway to the final product and may alter reaction behavior. Surface-bound intermediates are therefore important when interpreting how electrode materials influence reaction rates, selectivity, and the efficiency of electrochemical conversion.
Chemists infer the role of electrochemical intermediates by relating molecular-scale steps to measurable current and voltage. These electrical signals provide a way to examine how electron transfer and intermediate formation correspond to the overall reaction. This connection supports pathway analysis, helping distinguish mechanistic explanations from descriptions based only on the final product.
Applications span both synthesis and energy technologies. In electrosynthesis, understanding intermediates helps control the route toward a desired product. The same mechanistic knowledge supports catalyst design for fuel cells and electrolyzers, informs efforts to improve batteries, and helps develop strategies for controlling corrosion. These uses connect intermediate chemistry with practical reaction performance.