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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Expression and Purification of Nuclease-Free Oxygen Scavenger Protocatechuate 3,4-Dioxygenase
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Enzyme-Inspired Single Selenium Site for Selective Oxygen Reduction.

Peng-Yang Zhang1, Xia Xu1, Wen-Song Yu1

  • 1State Key Laboratory of Physical Chemistry of Solids, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China.

Angewandte Chemie (International Ed. in English)
|January 20, 2025
PubMed
Summary
This summary is machine-generated.

Biomimetic single selenium sites on carbon catalysts mimic selenoenzymes for highly selective oxygen reduction reactions (ORR). This advanced catalyst design significantly reduces hydrogen peroxide byproducts, improving catalyst stability and performance.

Keywords:
Enzyme-mimetic catalysisOxygen reduction reactionReactive oxygen speciesSelectivitySingle-atom catalysts

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Area of Science:

  • Catalysis
  • Materials Science
  • Biomimetic Chemistry

Background:

  • Nature-inspired design offers novel solutions for material and catalyst development.
  • Selenoenzymes play crucial roles in peroxide metabolism and related reactions.
  • Oxygen reduction reaction (ORR) selectivity is critical for energy applications.

Purpose of the Study:

  • To design a biomimetic catalyst mimicking selenoenzyme activity for ORR.
  • To achieve high 4-electron selectivity and minimize hydrogen peroxide byproducts.
  • To enhance the selectivity and stability of various ORR catalysts.

Main Methods:

  • Synthesis of single selenium (Se) site-modified carbon (C) catalysts.
  • Electrochemical characterization of oxygen reduction reaction (ORR) performance.
  • In situ X-ray absorption spectroscopy and theoretical calculations.

Main Results:

  • The Se-C catalyst achieved nearly 100% 4-electron selectivity with minimal H2O2 yield (0.039%), outperforming platinum (Pt) by 65 times.
  • Se-C demonstrated enzyme-like behavior, effectively scavenging oxygen atoms from peroxide intermediates.
  • Se-C significantly improved the 2+2 electron selectivity of Co-N-C, Fe-N-C, and N-C catalysts, reducing H2O2 yields by up to 98%.

Conclusions:

  • Biomimetic design of single Se sites offers a powerful strategy for tuning ORR selectivity.
  • The enzyme-like activity of Se sites enhances catalyst stability by preventing oxidative degradation.
  • This approach opens new avenues for designing highly selective catalysts for ORR and other reactions.