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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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Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
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Voltaic/Galvanic Cells02:47

Voltaic/Galvanic Cells

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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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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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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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Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Related Experiment Video

Updated: Sep 24, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Ionic liquid-based electrolytes for CO2 electroreduction and CO2 electroorganic transformation.

Xingxing Tan1, Xiaofu Sun1, Buxing Han1

  • 1Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Colloid and Interface and Thermodynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

National Science Review
|May 9, 2022
PubMed
Summary
This summary is machine-generated.

Ionic liquids enable efficient electrochemical conversion of carbon dioxide (CO2) into valuable products. This review highlights advances in CO2 electroreduction and electroorganic transformations using ionic liquids for sustainable chemical synthesis.

Keywords:
carbon dioxideelectrocatalysisgreen synthesisionic liquidvalue-added fuels and chemicals

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Area of Science:

  • Green Chemistry and Sustainable Energy
  • Electrochemistry and Catalysis

Background:

  • Carbon dioxide (CO2) is a key C1 feedstock for chemical synthesis.
  • Electrochemical CO2 conversion offers a pathway for carbon cycle closure and renewable energy storage.
  • Ionic liquids (ILs) present promising, tailorable alternatives to conventional electrolytes.

Purpose of the Study:

  • To review recent advancements in electrochemical CO2 transformation using IL-based media.
  • To focus on direct CO2 electroreduction (CO2ER) and CO2-involved electroorganic transformation (CO2EOT).
  • To provide guidance for designing novel IL-based electrochemical CO2 conversion processes.

Main Methods:

  • Review of literature on electrochemical CO2 conversion in ILs.
  • Analysis of factors influencing catalytic activity, selectivity, and reusability.
  • Discussion of reactor configurations and operating conditions.

Main Results:

  • ILs enhance CO2 conversion performance compared to conventional electrolytes.
  • Electrocatalysts, IL components, and operating conditions significantly impact reaction outcomes.
  • Both CO2ER and CO2EOT processes show promise for producing value-added products.

Conclusions:

  • Ionic liquids are effective media for electrochemical CO2 conversion.
  • Further research is needed to address challenges and optimize IL-based processes.
  • Rational design of ILs and electrochemical systems is crucial for future advancements.