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Boosting Electrode Performance and Bubble Management via Direct Laser Interference Patterning.

Hannes Rox1,2, Fabian Ränke3, Jonathan Mädler2

  • 1Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany.

ACS Applied Materials & Interfaces
|January 30, 2025
PubMed
Summary
This summary is machine-generated.

Laser structuring significantly enhances nickel electrodes for water electrolysis by optimizing surface area and reducing energy loss. This technique improves the oxygen evolution reaction performance through controlled surface patterns.

Keywords:
alkaline water electrolysisbubble dynamicsdirect laser interference patterninglaser-structured electrodesoxygen evolution reactionshadowgraphy

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Engineering

Background:

  • Optimizing electrodes is crucial for efficient water electrolysis.
  • Laser-structuring techniques offer novel approaches for surface modification.

Purpose of the Study:

  • To investigate the impact of laser-induced surface patterns on pure nickel electrode performance for water electrolysis.
  • To determine the key processing parameters influencing electrode efficiency.

Main Methods:

  • Systematic experimental study using Direct Laser Interference Patterning.
  • Statistical design of experiments to analyze spatial period and aspect ratio effects.
  • Electrochemical performance testing, including oxygen evolution reaction (OER) analysis.

Main Results:

  • Spatial distance of laser structures is the critical parameter for performance enhancement.
  • Electrocatalytically active surface area increased 12-fold compared to non-structured electrodes.
  • Reduced OER onset potential and overpotential (≈ -164 mV at 100 mA cm⁻²) achieved.

Conclusions:

  • Laser structuring, particularly controlling spatial periodicity, significantly boosts nickel electrode efficiency for water electrolysis.
  • Superhydrophilic surfaces and modified bubble dynamics contribute to improved OER performance.
  • Optimized electrode surfaces reduce ohmic resistance by minimizing electrode blocking.