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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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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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Carbon Quantum Dot-Enabled Microcrystalline Domain Engineering for Selective Four-Electron Oxygen Reduction.

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Carbon quantum dots engineer microcrystalline domains in catalysts for efficient oxygen reduction reactions (ORR). This noble-metal-free approach enhances durability and performance in zinc-air batteries.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Developing efficient, durable, and noble-metal-free electrocatalysts for the oxygen reduction reaction (ORR) is crucial for clean energy technologies.
  • Engineering well-defined microcrystalline domains in carbon-based catalysts presents a significant challenge.

Purpose of the Study:

  • To report a carbon quantum dot (CQD)-enabled strategy for engineering microcrystalline domains in carbon catalysts.
  • To investigate the impact of CQDs on graphitic ordering, electronic structure, and active-site distribution.
  • To enhance ORR performance and durability for energy conversion devices.

Main Methods:

  • Incorporation of CQDs during the carbonization process of carbon catalysts.
  • Characterization of structural and electronic properties of the engineered catalysts.
  • Electrochemical evaluation of ORR activity and zinc-air battery performance.

Main Results:

  • CQD incorporation promoted spatially distributed microcrystalline domains with enriched B-N coordination and optimized charge density.
  • The engineered catalyst exhibited enhanced O2 activation and O adsorption, favoring a selective four-electron ORR pathway.
  • The catalyst achieved a half-wave potential near commercial Pt/C and demonstrated high power densities (153 mW cm−2 in liquid, 123.8 mW cm−2 in flexible cells) with over 1200 h of stable operation in zinc-air batteries.

Conclusions:

  • CQD-enabled microcrystalline domain engineering is an effective strategy for tuning structure-property relationships in carbon electrocatalysts.
  • This approach provides valuable design insights for developing high-performance, noble-metal-free catalysts for energy conversion devices.