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Controlling the electrode/electrolyte interface is key for electrocatalyst design. This study reveals local pH effects significantly impact oxygen evolution reaction (OER) performance, not intrinsic activity.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Surface Chemistry

Background:

  • Understanding electrode/electrolyte interface control is crucial for advancing electrocatalyst design.
  • Microscopic electrode kinetics are essential for developing electrocatalysts with specific functionalities.
  • The oxygen evolution reaction (OER) is a critical process in many electrochemical applications.

Purpose of the Study:

  • To investigate the key influencing factors controlling the electrode/electrolyte interface.
  • To understand the role of local pH effects on the oxygen evolution reaction (OER) using an iridium dioxide electrocatalyst.
  • To establish guiding principles for designing high-performance electrocatalysts.

Main Methods:

  • Utilized an iridium dioxide electrocatalyst to study the oxygen evolution reaction (OER).
  • Investigated the effect of pH mismatch between the local electrode surface and bulk electrolyte.
  • Employed a wide spectrum of analytical approaches to verify findings.

Main Results:

  • Discovered a significant pH mismatching effect at the electrode/electrolyte interface.
  • Demonstrated that intrinsic OER activity is identical under acidic or near-neutral conditions when pH mismatch is adjusted.
  • Identified local pH effects at the electrified solid-liquid interface as the primary cause of 'fake' OER performance.

Conclusions:

  • Local pH significantly influences observed OER performance, masking intrinsic electrocatalytic activity.
  • Adjusting for local pH effects reveals identical intrinsic OER activity for iridium dioxide.
  • This work advances the understanding of proton-induced effects at electrode interfaces, aiding future electrocatalyst development.