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Related Concept Videos

Electrolysis03:00

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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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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Controlled-Potential Coulometry: Electrolytic Methods01:17

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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.
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Electrodeposition01:08

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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.
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Voltaic/Galvanic Cells02:47

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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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Voltammetric Techniques: Pulse Voltammetry01:17

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Differential-pulse voltammetry (DPV) is a type of voltammetry that involves applying a series of voltage pulses to an electrochemical cell while measuring the resulting current. In DPV, the differential pulse or small potential pulses are superimposed on a linear potential sweep. The magnitude of these pulses is typically small, often in the millivolt range. Each voltage pulse lasts a short duration, usually in the order of a few milliseconds, and is applied at regular intervals along the...
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Pulsed electrolysis - explained.

T Miličić1, M Sivasankaran1, C Blümner1,2

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Summary
This summary is machine-generated.

Pulsed electrolysis offers improved product selectivity over steady-state methods. This study introduces a nonlinear frequency response analysis framework to quantify improvements, using the DC component as a key metric for dynamic electrochemical processes.

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Area of Science:

  • Electrochemistry
  • Chemical Engineering
  • Nonlinear Dynamics

Background:

  • Pulsed electrolysis is gaining interest for enhanced selectivity compared to steady-state operation.
  • Selectivity in pulsed electrolysis can be tuned by parameters like pulsing profile and frequency.
  • A theoretical framework for understanding these improvements is currently lacking.

Purpose of the Study:

  • To propose a theoretical framework for evaluating improvements in pulsed electrolysis.
  • To introduce nonlinear frequency response analysis for dynamic electrochemical systems.
  • To identify and quantify the DC component as a measure of process improvement.

Main Methods:

  • Development of a nonlinear frequency response analysis framework.
  • Theoretical calculation of the DC component.
  • Experimental measurement of the DC component.

Main Results:

  • The DC component quantifies the difference between dynamic and steady-state operation mean output values.
  • The DC component is directly linked to the nonlinearities within the electrochemical process.
  • A method to theoretically calculate and experimentally obtain the DC component is demonstrated.

Conclusions:

  • The proposed nonlinear frequency response analysis provides a theoretical basis for pulsed electrolysis improvements.
  • The DC component serves as a valuable metric for assessing process enhancement under dynamic conditions.
  • This framework enables better understanding and optimization of pulsed electrolysis.