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Structured Selective Activation for Bubble-Controlled High-Rate Alkaline OER.

Youngseob Lee1, Donggeun Eom2, Sangwook Park2,3,4,5

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Summary
This summary is machine-generated.

Engineers developed a novel nickel-plate electrode for alkaline oxygen evolution, improving gas bubble management and mass transport. This scalable design offers enhanced activity and durability for electrochemical applications.

Keywords:
amorphous catalystgas bubble dynamicsmass transportoxygen evolution reactionselective activation

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Efficient gas bubble management is crucial for alkaline oxygen evolution electrodes.
  • Current scalable and cost-effective designs are limited.
  • Interfacial bubble dynamics impact electrode performance.

Purpose of the Study:

  • To present an asymmetrically activated nickel-plate electrode for improved gas bubble management.
  • To enhance mass transport and mitigate overpotential in alkaline oxygen evolution.
  • To demonstrate a scalable strategy for high-performance electrodes.

Main Methods:

  • Fabrication via micromilling, polytetrafluoroethylene (PTFE) coating, and electrodeposition of amorphous nickel-iron (NiFe) catalysts.
  • Creation of deactivated and activated regions for directional bubble release.
  • Utilizing gridded microchannels for electrolyte renewal.

Main Results:

  • Achieved 408 mV at 1000 mA cm-2, mitigating transport overpotential.
  • Reached a high electrochemically active surface area (ECSA)-normalized current density of 210 mA cm-2.
  • Demonstrated sustained performance over 100 hours with a monolithic framework, defect-rich catalysts, and stable PTFE coating.

Conclusions:

  • The asymmetric electrode design effectively controls interfacial bubble dynamics.
  • This strategy provides both high activity and long-term durability for alkaline oxygen evolution.
  • The presented work offers a simple and scalable structural solution for advanced electrode design.