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Related Concept Videos

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

Controlled-Current Coulometry: Overview

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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...
162
Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Chemiosmosis01:32

Chemiosmosis

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Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Updated: Jun 30, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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CO2 Electrolyzers.

Colin P O'Brien1, Rui Kai Miao1, Ali Shayesteh Zeraati1

  • 1Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario M5S 3G8, Canada.

Chemical Reviews
|March 22, 2024
PubMed
Summary
This summary is machine-generated.

Electrochemical CO2 reduction advances efficiency for fuels and chemicals. A holistic upstream-to-downstream strategy is crucial for commercializing CO2 electrolyzers and minimizing energy use.

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Area of Science:

  • Electrochemistry
  • Chemical Engineering
  • Materials Science

Background:

  • Carbon dioxide (CO2) electrolysis shows promise for converting CO2 into valuable chemicals and fuels.
  • Current CO2 electrolyzer systems face challenges in energy efficiency and integration for commercial viability.
  • System-level optimization, considering upstream and downstream processes, is essential for advancing CO2 reduction technologies.

Purpose of the Study:

  • To provide a comprehensive overview of CO2 electrolyzer systems, from CO2 sources to product utilization.
  • To evaluate different system architectures and conversion pathways for electrochemical CO2 reduction.
  • To identify promising routes for commercialization by minimizing energy intensity and enabling viable use cases.

Main Methods:

  • Analysis of upstream CO2 sources, their energy intensities, and impurities.
  • Evaluation of electrochemical cell architectures and component performance.
  • Assessment of alternative approaches, including integration with CO2 capture and flue gas conversion.
  • Examination of pathways to minimize downstream separations and produce concentrated product streams.

Main Results:

  • CO2 electrolyzers have achieved significant progress in energy efficiency and selectivity for products like syngas, ethylene, and ethanol.
  • A comprehensive upstream-to-downstream approach is necessary to overcome challenges in commercialization.
  • Integration with CO2 capture and direct flue gas conversion present potential pathways for improved efficiency.
  • Minimizing downstream separations is key to producing concentrated product streams compatible with existing industrial sectors.

Conclusions:

  • Electrochemical CO2 reduction holds significant potential for sustainable chemical and fuel production.
  • A holistic system design, optimizing the entire process from CO2 sourcing to product separation, is critical for commercial success.
  • Further research and development focusing on integrated systems and efficient separation techniques will accelerate the deployment of CO2 electrolyzers.