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Local Structure Modulation of Ir Single Atoms on Ce-Modified Cobalt Oxide for Acidic Oxygen Evolution.

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This study developed a novel iridium single-atom electrocatalyst on Ce-modified cobalt oxide, significantly enhancing stability and performance for acidic oxygen evolution reactions (OER) while reducing iridium loading.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • Iridium is scarce and expensive, necessitating reduced loading in catalysts.
  • Single-atom catalysts on metal oxides show promise but often lack durability.
  • Metal dissolution and lattice bond disruption compromise catalyst stability under reaction conditions.

Purpose of the Study:

  • To develop a stable and efficient iridium single-atom electrocatalyst for acidic oxygen evolution reactions (OER).
  • To investigate the role of cerium modification in stabilizing iridium single atoms and enhancing catalytic performance.
  • To elucidate the reaction mechanism and assess practical applicability in water electrolysis.

Main Methods:

  • Synthesis of iridium single atoms supported on Ce-modified Co3O4 (Ir-Co3O4/CeO2).
  • Electrochemical characterization including overpotential and stability testing.
  • Mechanistic studies using time-of-flight secondary ion mass spectrometry and molecular probe tests.
  • Proton exchange membrane water electrolysis (PEMWE) testing.

Main Results:

  • Ce incorporation stabilized Ir single atoms and improved interfacial interactions.
  • The catalyst exhibited a low overpotential of 254 mV at 10 mA cm-2 for OER.
  • Demonstrated remarkable stability: 300 h in OER and 90 h in PEMWE at high current density.
  • Mechanistic studies confirmed the adsorbate evolution mechanism.

Conclusions:

  • The Ir-Co3O4/CeO2 catalyst offers enhanced activity and stability for acidic OER.
  • Ce modification is crucial for stabilizing single iridium atoms and optimizing active sites.
  • The catalyst shows superior practical applicability for water electrolysis compared to previous catalysts with higher iridium loadings.