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Perovskite for Electrocatalytic Oxygen Evolution at Elevated Temperatures.

Fatma Abdelghafar1,2, Xiaomin Xu1, San Ping Jiang1,3

  • 1WA School of Mines: Minerals, Energy and Chemical Engineering (WASM-MECE), Curtin University, Perth, WA, 6102, Australia.

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Summary
This summary is machine-generated.

Advanced electrolysis requires efficient catalysts for the oxygen evolution reaction (OER). This study evaluates perovskite catalyst performance at elevated temperatures, finding increased activity but reduced stability.

Keywords:
elevated temperaturelattice oxygen participationoxygen evolution reactionperovskitewater splitting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Anion exchange membrane water electrolyzers (AEMWE) are crucial for sustainable energy.
  • Efficient catalysts for the oxygen evolution reaction (OER) are needed for AEMWE.
  • Current OER research often overlooks AEMWE's operating temperatures (50-80°C).

Purpose of the Study:

  • To investigate the effect of temperature on OER catalytic activity and stability.
  • To understand OER mechanisms in perovskite catalysts at elevated temperatures.
  • To provide insights for developing practical OER catalysts for water electrolyzers.

Main Methods:

  • Evaluated Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) perovskite catalyst.
  • Assessed OER activity and stability at varying temperatures.
  • Analyzed temperature-induced changes in catalyst structure and composition.

Main Results:

  • BSCF catalyst activity increased with temperature, driven by lattice oxygen participation.
  • Higher temperatures led to increased surface amorphization and cation leaching.
  • OER stability of BSCF was somewhat reduced at elevated temperatures.

Conclusions:

  • Temperature significantly influences OER catalysis in perovskite materials.
  • Lattice oxygen-mediated OER is enhanced at higher temperatures.
  • Understanding temperature effects is vital for designing robust OER catalysts for AEMWE.