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Related Concept Videos

Electrodeposition01:08

Electrodeposition

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 Cells

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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For electrode reversibility to be maintained, all the reactants and products involved in the half-reaction must be present at the electrode. There are several types of reversible electrodes (half-cells).In metal-metal-ion electrodes, a metal balances electrochemically with a solution of its own ions. Examples are Cu2+|Cu and Zn2+|Zn. Metals that react with the solvent, like group 1 and most group 2 metals, which react with water, and zinc, which reacts with aqueous acidic solutions, cannot be...
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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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Precipitation and Co-precipitation

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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[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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A soluble copper-bipyridine water-oxidation electrocatalyst.

Shoshanna M Barnett1, Karen I Goldberg, James M Mayer

  • 1Department of Chemistry, University of Washington, Seattle, Washington 98195, USA.

Nature Chemistry
|May 23, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed the first copper-based catalyst for water oxidation, a crucial step in producing chemical fuels. This efficient, inexpensive catalyst operates rapidly, offering a promising advancement in electrocatalysis.

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Materials Science

Background:

  • Water oxidation to O(2) is vital for chemical fuel production from electricity.
  • Developing efficient, inexpensive, and robust electrocatalysts remains a significant challenge.
  • Existing catalysts face limitations in performance and cost.

Purpose of the Study:

  • To report the development of the first copper-based catalyst for electrolytic water oxidation.
  • To investigate the catalytic activity and mechanism of copper-bipyridine-hydroxo complexes.
  • To assess the efficiency and speed of this novel homogeneous water-oxidation catalyst.

Main Methods:

  • In situ formation of copper-bipyridine-hydroxo complexes from copper salts and bipyridine at high pH.
  • Cyclic voltammetry to assess catalytic activity at pH 11.8-13.3.
  • Electrochemical and fluorescence probe methods to confirm O(2) production.
  • Electron paramagnetic resonance (EPR) and other studies to characterize the catalyst.

Main Results:

  • Copper-bipyridine-hydroxo complexes exhibit rapid in situ formation.
  • Catalysis occurs at approximately 750 mV overpotential with large, irreversible currents.
  • O(2) production was successfully demonstrated electrochemically and via fluorescence.
  • The dominant active species was identified as (2,2'-bipyridine)Cu(OH)(2).

Conclusions:

  • The developed copper-based complex is the first homogeneous catalyst for water oxidation.
  • This catalyst demonstrates high efficiency with a turnover frequency of ~100 s(-1).
  • The findings present a significant advancement in the search for practical electrocatalysts for water splitting.