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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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Four-electron oxygen reduction by brominated cobalt corrole.

Alex Schechter1, Maria Stanevsky, Atif Mahammed

  • 1Department of Biological Chemistry, Ariel University Center of Samaria, Ariel 40700, Israel. salex@ariel.ac.il

Inorganic Chemistry
|January 7, 2012
PubMed
Summary

A novel cobalt(III) complex, Co(tpfc)Br(8)/C, shows excellent performance for electrocatalytic oxygen reduction. This non-platinum catalyst utilizes a direct four-electron pathway, offering a promising alternative for aqueous solutions.

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Area of Science:

  • Electrochemistry
  • Catalysis
  • Materials Science

Background:

  • Platinum-based catalysts are standard for oxygen reduction reactions but are expensive.
  • Developing cost-effective, non-platinum alternatives is crucial for advancing electrochemical technologies.
  • Cobalt corrole complexes are explored for their catalytic potential.

Purpose of the Study:

  • To introduce and characterize a novel carbon-supported cobalt(III) complex, Co(tpfc)Br(8)/C, as a non-platinum electrocatalyst.
  • To investigate the kinetic parameters and pH-dependent activity of this catalyst for oxygen reduction.
  • To elucidate the mechanism of oxygen reduction catalyzed by Co(tpfc)Br(8)/C.

Main Methods:

  • Electrochemical studies using rotating ring disk electrode (RRDE) techniques.
  • Systematic investigation across a wide pH range (0-11).
  • Analysis of redox couples and catalytic activity onset potentials.

Main Results:

  • The Co(tpfc)Br(8)/C catalyst demonstrated significant activity for oxygen reduction, particularly in acidic media.
  • Positive shifts in Co(II)/Co(III) and O(2) redox potentials were observed, with an onset potential of 0.56 V at pH 0.
  • Independent measurements confirmed a direct four-electron pathway to water as the dominant mechanism.

Conclusions:

  • The carbon-supported cobalt(III) complex, Co(tpfc)Br(8)/C, is a highly effective non-platinum electrocatalyst for oxygen reduction.
  • Its activity and mechanism are favorable for applications in aqueous electrochemical systems.
  • This catalyst presents a viable alternative to platinum for oxygen reduction reactions.