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Oxygen Evolution Reaction over the Au/YSZ Interface at High Temperature.

Yuefeng Song1,2, Si Zhou3, Qiao Dong2,4

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Angewandte Chemie (International Ed. in English)
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PubMed
Summary
This summary is machine-generated.

The Au/yttria-stabilized zirconia (YSZ) interface shows high oxygen evolution reaction (OER) activity in solid oxide electrolysis cells (SOECs). This interface facilitates oxygen spillover, enhancing OER performance at high temperatures.

Keywords:
electrolysismetal-oxide interfacesoxygen evolution reactionsolid oxide electrolysis cells

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Catalysis

Background:

  • The oxygen evolution reaction (OER) is critical for solid oxide electrolysis cells (SOECs) but is kinetically limited at high temperatures (600-850°C).
  • Perovskite oxides are common OER catalysts, but secondary phase formation at interfaces impedes performance.
  • Understanding interfacial effects is crucial for improving OER catalysts in SOECs.

Purpose of the Study:

  • To investigate the OER activity of the Au/yttria-stabilized zirconia (YSZ) interface.
  • To compare the OER performance of the Au/YSZ interface with traditional perovskite anodes.
  • To elucidate the mechanism behind the enhanced OER activity at the Au/YSZ interface.

Main Methods:

  • Electrochemical characterization techniques.
  • Density functional theory (DFT) calculations.
  • In situ X-ray photoelectron spectroscopy (XPS).

Main Results:

  • The Au/YSZ interface exhibits significantly higher OER activity compared to lanthanum strontium manganite/YSZ anodes.
  • DFT calculations and experimental evidence indicate interfacial oxygen spillover from YSZ to Au as the key mechanism.
  • In situ XPS confirmed the presence of spillover oxygen on the Au surface.

Conclusions:

  • The Au/YSZ interface is a highly active catalyst for the oxygen evolution reaction in high-temperature SOECs.
  • Interfacial oxygen spillover is a viable strategy for enhancing OER performance.
  • This finding opens new avenues for designing efficient electrocatalysts for SOECs.