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Related Concept Videos

Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

831
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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Processes at Electrodes01:30

Processes at Electrodes

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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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Potentiometry: Types of Electrodes01:19

Potentiometry: Types of Electrodes

2.5K
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
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Electrodeposition01:08

Electrodeposition

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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

2.2K
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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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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Related Experiment Video

Updated: Mar 21, 2026

Synthesizing a Gel Polymer Electrolyte for Supercapacitors, Assembling a Supercapacitor Using a Coin Cell, and Measuring Gel Electrolyte Performance
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Solution Processed PEDOT Analogues in Electrochemical Supercapacitors.

Anna M Österholm1, James F Ponder1, Justin A Kerszulis1

  • 1School of Chemistry and Biochemistry, School of Materials Science and Engineering, Center for Organic Photonics and Electronics, Georgia Tech Polymer Network, Georgia Institute of Technology , Atlanta, Georgia 30332-0400, United States.

ACS Applied Materials & Interfaces
|May 20, 2016
PubMed
Summary

Fully soluble ProDOTx-EDOTy copolymers offer a surfactant-free alternative to PEDOT for supercapacitors. These new materials enable scalable, high-throughput processing for thin-film supercapacitors with comparable performance to electrodeposited PEDOT.

Keywords:
PEDOTcharge storagedioxythiophene polymerselectrochemical supercapacitors

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Electrochemical Preparation of Poly3,4-Ethylenedioxythiophene Layers on Gold Microelectrodes for Uric Acid-Sensing Applications
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Electrochemical Preparation of Poly3,4-Ethylenedioxythiophene Layers on Gold Microelectrodes for Uric Acid-Sensing Applications
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Electrochemical Preparation of Poly3,4-Ethylenedioxythiophene Layers on Gold Microelectrodes for Uric Acid-Sensing Applications

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Electropolymerized poly(3,4-ethylenedioxythiophene) (PEDOT) is a key material in energy storage devices.
  • Current methods for PEDOT synthesis often rely on surfactants or dispersants, limiting processing options.
  • There is a need for soluble PEDOT analogues that allow for scalable, solution-based fabrication.

Purpose of the Study:

  • To design and synthesize fully soluble ProDOTx-EDOTy copolymers.
  • To evaluate the electrochemical performance of these copolymers as active materials in thin-film supercapacitors.
  • To compare the performance of solution-processed supercapacitors with those using electrodeposited PEDOT.

Main Methods:

  • Synthesis of fully soluble ProDOTx-EDOTy copolymers.
  • Fabrication of thin-film supercapacitors using the synthesized copolymers as active layers.
  • Electrochemical characterization including capacitance, stability, and charge/discharge cycling.
  • Performance evaluation of energy and power densities.

Main Results:

  • The ProDOTx-EDOTy copolymers are electrochemically equivalent to electropolymerized PEDOT.
  • Solution-processed thin-film supercapacitors demonstrated comparable capacitance, stability, and voltage to PEDOT-based devices.
  • Supercapacitors achieved high cell voltages (up to 1.6 V) and long-term stability (>50,000 cycles).
  • Achieved energy densities of 4-18 Wh/kg and power densities of 0.8-3.3 kW/kg.

Conclusions:

  • Fully soluble ProDOTx-EDOTy copolymers provide a viable, surfactant-free alternative to PEDOT for supercapacitor applications.
  • These copolymers enable large-scale, high-throughput processing of thin-film supercapacitors.
  • The developed supercapacitors exhibit excellent performance metrics, including high voltage, stability, and energy/power densities.