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High-Density Cobalt Single-Atom Catalysts for Enhanced Oxygen Evolution Reaction.

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We developed a new method to create high-density single atom catalysts (SACs) using macromolecules. This significantly improved the oxygen evolution reaction (OER) performance and stability of cobalt single atoms in a nitrogen-rich carbon network.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Single atom catalysts (SACs) offer unique properties but face challenges like low loading and instability.
  • Optimizing metal-support interactions is crucial for enhancing SAC performance.

Purpose of the Study:

  • To develop a macromolecule-assisted synthesis approach for high-density single atom catalysts.
  • To investigate the enhanced electrocatalytic activity and stability of these SACs for the oxygen evolution reaction (OER).

Main Methods:

  • Macromolecule-assisted synthesis of cobalt single atoms (Co SACs) on a pyridinic N-rich graphenic network.
  • Electrocatalytic testing in 1 M KOH for OER.
  • Operando X-ray absorption near-edge structure (XANES) spectroscopy.
  • Density functional theory (DFT) calculations.

Main Results:

  • Achieved high-density Co SAC loading (10.6 wt %) in a porous carbon network (surface area of ~186 m² g⁻¹).
  • Demonstrated significantly enhanced OER performance (η₁₀ at 351 mV; mass activity of 2209 mA mgCo⁻¹ at 1.65 V) with over 300 hours of stability.
  • Operando XANES revealed electron-deficient Co-O intermediates, and DFT confirmed facile electron transfer accelerating OER kinetics.

Conclusions:

  • The macromolecule-assisted strategy effectively produces high-density SACs with improved catalytic properties.
  • The developed Co SACs show excellent potential for efficient and stable electrocatalytic OER.
  • Understanding the electronic structure and reaction intermediates is key to designing advanced catalysts.