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Related Concept Videos

Standard Electrode Potentials03:02

Standard Electrode Potentials

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On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
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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.
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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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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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The Electrical Double Layer

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In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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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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Electrostatic Stimulation of Monopolar Electrodes.

Arvind Singh Heer1, Harlan Mantelli1, Qi Han1

  • 1Department of Chemistry, Case Western Reserve University, Cleveland, Ohio 44106-7078, United States.

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Researchers stimulated selenous acid reduction to elemental selenium using a monopolar electrode (ME). This novel electrochemical technique precisely quantifies stimulation efficiency, offering new insights into electrode surface dynamics and microstructure.

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Area of Science:

  • Electrochemistry
  • Surface Science
  • Analytical Chemistry

Background:

  • The reduction of selenous acid (H2SeO3) to elemental selenium is a key electrochemical process.
  • Controlling interfacial potential is crucial for manipulating reaction rates at electrode surfaces.

Purpose of the Study:

  • To investigate the stimulation of selenous acid reduction using a novel monopolar electrode (ME) configuration.
  • To develop a quantitative method for determining the efficiency of this electrochemical stimulation.

Main Methods:

  • Utilized a stationary Au ring disk electrode setup with a distant counter electrode to induce electrostatic potential changes.
  • Employed coulometric analysis of selenium oxidation to quantify the stimulation effect.
  • Validated experimental results with theoretical simulations using COMSOL Multiphysics.

Main Results:

  • Successfully stimulated the reduction of selenous acid to elemental selenium at the Au ring electrode.
  • Demonstrated that stimulation is linked to surface overpotential variations.
  • Achieved excellent quantitative agreement between experimental data and COMSOL simulations.

Conclusions:

  • The monopolar electrode technique provides a novel and effective method for stimulating electrochemical reactions.
  • This approach allows for accurate quantification of stimulation efficiency.
  • The findings open new avenues for studying surface diffusion, interfacial dynamics, and electrode microstructure modifications.