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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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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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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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Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
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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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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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Related Experiment Video

Updated: Jan 10, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Electrochemical potential-driven water dynamics control CO2 electroreduction at the Ag/H2O interface.

Xiongwei Tian1,2, Axel Tosello Gardini2,3, Umberto Raucci2

  • 1Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing, China.

Nature Communications
|November 27, 2025
PubMed
Summary
This summary is machine-generated.

The applied potential significantly alters interfacial water behavior during CO2 electroreduction. Solvent dynamics, not just the catalyst, are crucial for stabilizing intermediates and facilitating reactions.

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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Area of Science:

  • Electrocatalysis
  • Computational Chemistry
  • Materials Science

Background:

  • Understanding the catalyst-electrolyte interface is key for electrocatalysis.
  • The influence of electrochemical potential on CO2 electroreduction is not fully understood.

Purpose of the Study:

  • Investigate the impact of working potentials on CO2 reduction at the Ag(111)/H2O interface.
  • Elucidate the role of interfacial solvation and solvent dynamics.

Main Methods:

  • Machine learning-accelerated molecular dynamics simulations.
  • Explicit solvent model within the grand canonical DFT framework.
  • Enhanced sampling techniques.

Main Results:

  • Applied potential reshapes interfacial water orientation and hydrogen-bond network.
  • Solvent response stabilizes reactive intermediates and regulates reaction kinetics.
  • Potential-sensitive solvent dynamics facilitate proton transfer and hydroxide diffusion.

Conclusions:

  • Solvent dynamics play a critical role in CO2 electroreduction.
  • Simulating electrochemical reactions under realistic conditions is essential.
  • The solvent acts as a dynamic, potential-sensitive participant in catalysis.