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Mitigating A-Site Segregation in Pyrochlore Oxides: Enhancing Oxygen Evolution Reaction Performance through Surface

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Summary
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Surface engineering of bismuth ruthenate pyrochlores with l-ascorbic acid prevents cation segregation. This strategy enhances oxygen evolution reaction (OER) electrocatalysis by creating a heterostructure with improved oxygen vacancies and electron transfer.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Oxygen evolution reaction (OER) electrocatalyst performance is often limited by A-site cation segregation in pyrochlores.
  • Bismuth ruthenate (Bi2Ru2O7) shows promise for OER but suffers from Bi3+ segregation.

Purpose of the Study:

  • To engineer the surface of Bi2Ru2O7 to mitigate Bi3+ segregation and enhance OER performance.
  • To investigate the structural and electronic changes induced by surface modification.

Main Methods:

  • Sol-gel synthesis of Bi2Ru2O7.
  • Surface treatment with l-ascorbic acid to remove Bi2O3 passivation.
  • Electrochemical testing (OER performance, stability).
  • Material characterization and density functional theory (DFT) calculations.

Main Results:

  • l-ascorbic acid treatment successfully removed the Bi2O3 layer and formed an amorphous RuOx layer, creating a Bi2Ru2O7/RuOx heterostructure.
  • The engineered catalyst exhibited significantly enhanced OER activity, with an overpotential of 259 mV at 10 mA cm-2.
  • The catalyst demonstrated excellent stability, operating continuously for over 30 hours.
  • DFT calculations and characterization confirmed increased oxygen vacancies and enhanced electron transfer in the modified material.

Conclusions:

  • Surface engineering is crucial for mitigating A-site segregation in pyrochlores.
  • The developed Bi2Ru2O7/RuOx heterostructure offers a promising strategy for advanced OER electrocatalysts.
  • This approach provides a new pathway for optimizing Ru-based pyrochlores for energy conversion applications.