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Electrolysis03:00

Electrolysis

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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: 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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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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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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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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Ladder Diagrams: Redox Equilibria01:30

Ladder Diagrams: Redox Equilibria

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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.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
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Decoupled Water Electrolysis at High Current Densities Using a Solution-Phase Redox Mediator.

Obeten Mbang Eze1,2, Zeliha Ertekin1, Mark D Symes1

  • 1School of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom.

Energy & Fuels : an American Chemical Society Journal
|April 16, 2025
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Decoupled electrolysis uses a liquid mediator to separate hydrogen and oxygen production, enabling efficient green hydrogen generation even with intermittent renewable power sources. This advanced system operates at high current densities, improving scalability for the hydrogen economy.

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Area of Science:

  • Electrochemistry
  • Green Chemistry
  • Renewable Energy

Background:

  • The hydrogen economy relies on efficient "green" hydrogen production via water electrolysis using renewable energy.
  • Conventional electrolyzers struggle with intermittent power, leading to gas mixture formation and reduced efficiency.
  • Decoupled electrolysis offers a solution by separating hydrogen and oxygen production but typically operates at low current densities.

Purpose of the Study:

  • To develop a decoupled electrolysis system capable of operating efficiently at significantly higher current densities.
  • To demonstrate the use of silicotungstic acid as a liquid-phase mediator for high-performance decoupled hydrogen production.
  • To overcome the limitations of low current density in existing decoupled electrolysis systems.

Main Methods:

  • Construction of a flow system device for decoupled electrolysis.
  • Utilizing a silicotungstic acid solution as a liquid-phase redox mediator.
  • Testing the system's performance across a wide range of current densities, from 50 mA/cm² to 1.35 A/cm².

Main Results:

  • Achieved essentially complete decoupling of hydrogen and oxygen generation across the tested current density range.
  • Demonstrated decoupled electrolysis performance at current densities exceeding commercial alkaline electrolyzers and approaching proton exchange membrane electrolyzers.
  • Validated the effectiveness of silicotungstic acid as a mediator for high-current-density decoupled hydrogen evolution.

Conclusions:

  • The developed flow system effectively enables high-current-density decoupled hydrogen production.
  • This technology addresses key limitations of previous decoupled electrolysis systems, enhancing suitability for the hydrogen economy.
  • The findings suggest a viable pathway for efficient and scalable green hydrogen generation from intermittent renewable energy sources.