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Related Concept Videos

Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

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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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Electrochemical Systems01:24

Electrochemical Systems

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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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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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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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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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Processes at Electrodes01:30

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The electrode interacts with ions in the electrolyte solution at its interface. The rate of oxidation and reduction depends on the speed at which electrons can transfer through this interface. As ions attach to or leave the electrode surface, the electrode acquires a charge, and an electrical potential forms across the interface, making the process more difficult to reach equilibrium. The charge on the electrode affects the local ion concentrations in the solution, though thermal motion...
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Related Experiment Video

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Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
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An electrochemical platform for localized pH control on demand.

N Fomina1, C A Johnson, A Maruniak

  • 1Robert Bosch LLC. Bosch Research & Technology Center, 4005 Miranda Ave, Palo Alto, CA 94304, USA. habib.ahmad@us.bosch.com.

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|May 21, 2016
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Summary

This study introduces dynamic pH control using electrochemistry and quinones, enabling precise, localized pH changes. This innovation allows for simultaneous, distinct pH microenvironments for advanced chemical and biological applications.

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Area of Science:

  • Electrochemistry
  • Chemical Engineering
  • Biochemistry

Background:

  • Solution pH is crucial for chemical reactions but typically static.
  • Traditional pH control methods lack spatial and temporal precision.
  • Existing electrochemical pH control is limited to two states and lacks spatial resolution.

Purpose of the Study:

  • To develop a method for dynamic, localized pH control.
  • To enable simultaneous generation of multiple distinct pH microenvironments.
  • To demonstrate pH-driven control of enzymatic activity.

Main Methods:

  • Utilized solution-borne quinones and galvanostatic excitation.
  • Employed dynamic current control for precise pH manipulation.
  • Integrated a pH sensor for real-time monitoring and feedback.

Main Results:

  • Achieved reproducible acidification and alkalinization up to 0.1 pH/s.
  • Generated and sustained 3 distinct pH microenvironments (±0.04 pH) for 13 minutes.
  • Demonstrated spatially-resolved, pH-driven enzymatic activity control.

Conclusions:

  • Developed a novel electrochemical technique for spatio-temporal pH control.
  • This method offers precise control over localized chemical environments.
  • Opens new possibilities for complex systems involving pH-dependent processes.