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Spin-Promotion Effect to Oxygen Evolution Reaction.

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Ferromagnetic catalysts enhance the oxygen evolution reaction (OER) at high pH by aligning electron spins on magnetic domains. This spin-promotion effect, crucial for OER catalysis, depends on the catalyst's domain structure.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Chemistry

Background:

  • The spin-promotion effect in ferromagnetic (FM) materials for the oxygen evolution reaction (OER) is of growing interest.
  • The underlying mechanisms linking atomic-scale spin interactions to macroscopic magnetic domains in OER remain unclear.

Purpose of the Study:

  • To provide a comprehensive overview of the mechanisms behind the spin-promotion effect in OER.
  • To bridge the understanding between spin interactions and magnetic domain roles in OER.

Main Methods:

  • Theoretical analysis of spin interactions in FM materials during OER.
  • Examination of the role of magnetic domains and domain walls in OER kinetics.
  • Correlation of catalyst domain structure with OER performance.

Main Results:

  • FM catalysts exhibit a spin-promotion effect on OER in high pH electrolytes.
  • High pH facilitates the formation of M-O• oxyl radicals, enabling spin alignment within magnetic domains.
  • Triplet O2 formation is accelerated on magnetic domains compared to domain walls.

Conclusions:

  • Magnetization promotes OER by converting domain walls to domains, enhancing spin-promotion.
  • The magnitude of the OER enhancement is dictated by the catalyst's magnetic domain structure.
  • External magnetic fields can enhance OER in any catalyst at high current densities via bubble removal, distinct from the spin-promotion effect.