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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Reactions01:27

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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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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Corrosion02:49

Corrosion

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The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
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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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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Oxides and Carbonates Accelerate Copper Instability in CO2 Electroreduction.

Petru P Albertini1, Saltanat Toleukhanova2, Jan Vavra1,2

  • 1Laboratory of Nanochemistry for Energy (LNCE), Institute of Chemical Sciences and Engineering (ISIC), École Polytechnique Fédérale de Lausanne, Sion CH-1950, Switzerland.

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Copper catalysts are key for converting CO2 into valuable products. However, their instability hinders performance. This study reveals that initial copper oxides and carbonates significantly accelerate catalyst degradation during the CO2 reduction reaction (CO2RR).

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • The electrochemical CO2 reduction reaction (CO2RR) is crucial for renewable energy systems.
  • Copper (Cu) catalysts are unique for producing multicarbon products but suffer from operational instability.
  • Understanding catalyst degradation is vital for improving CO2RR efficiency and durability.

Purpose of the Study:

  • To investigate how the initial chemical state of Cu surfaces (oxidation state, carbonate formation) affects catalyst stability and reconstruction during CO2RR.
  • To elucidate the role of oxides and carbonates in Cu catalyst deactivation pathways.
  • To provide insights for designing more stable and efficient Cu-based CO2RR catalysts.

Main Methods:

  • Utilized well-defined Cu catalysts.
  • Employed quasi-operando electrochemical liquid-phase transmission electron microscopy (ec-LPTEM).
  • Combined ec-LPTEM with electrochemical characterization techniques.

Main Results:

  • Catalysts with higher initial oxide content showed faster structural reconstruction and operational deactivation.
  • Formation of Cu carbonates further increased structural instability.
  • Carbonates were found to suppress CO2RR activity.

Conclusions:

  • Initial Cu oxides and carbonates critically influence catalyst reconstruction kinetics and durability.
  • Surface oxides and carbonates dictate the pathways leading to Cu catalyst deactivation under CO2RR conditions.
  • Controlling surface species is essential for enhancing the stability and efficiency of Cu-based CO2RR catalysts.