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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Superstructure-Assisted Single-Atom Catalysis on Tungsten Carbides for Bifunctional Oxygen Reactions.

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We developed a novel superstructure-assisted single-atom catalyst on tungsten carbides for enhanced zinc-air batteries. This catalyst significantly boosts oxygen reaction kinetics, achieving a low potential gap and high power density.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Single-atom catalysis (SAC) is crucial for high-performance electrocatalysts in zinc-air batteries.
  • Designing SACs with sufficient driving force for multi-electron oxygen reactions remains a significant challenge.

Purpose of the Study:

  • To develop a novel superstructure-assisted single-atom catalyst (SAC) on tungsten carbides for bifunctional oxygen reactions.
  • To investigate the role of ordered superstructures in enhancing catalytic activity.

Main Methods:

  • Fabrication of a superstructure-assisted SAC on tungsten carbides.
  • Experimental characterization of the catalyst's structure and properties.
  • Theoretical calculations (e.g., DFT) to understand reaction mechanisms and energetics.

Main Results:

  • Discovery of highly ordered cobalt superstructures at the tungsten carbide interface, inducing strain.
  • Demonstrated synergistic effects between superstructures and single atomic sites, reducing intermediate adsorption energy and overpotential.
  • Achieved an ultralow potential gap of 0.623 V for bifunctional oxygen reactions.
  • Assembled zinc-air batteries delivered a high power density of 188.5 mW cm⁻².

Conclusions:

  • The developed catalyst exhibits superior bifunctional activity for oxygen evolution and reduction reactions.
  • The combination of single atomic sites and ordered superstructures offers a new strategy for advanced catalyst design.
  • This work paves the way for next-generation atomic catalysis in energy storage devices.