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Tailoring 3D-Printed Electrodes for Enhanced Water Splitting.

Raúl A Márquez1, Kenta Kawashima1, Yoon Jun Son2

  • 1Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States.

ACS Applied Materials & Interfaces
|September 9, 2022
PubMed
Summary

Researchers optimized electrodes for alkaline water electrolysis by controlling surface properties and bubble release. This 3D printing approach enhances electrocatalyst testing for efficient clean energy storage.

Keywords:
3D printingelectrocatalystelectrodepositiongas bubbleswater splitting

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Clean Energy Technologies

Background:

  • Alkaline water electrolysis is crucial for energy storage but is limited by factors beyond intrinsic electrocatalysis.
  • Understanding and controlling extrinsic electrode properties is essential for comparing catalytic materials.

Purpose of the Study:

  • To investigate how electrode and surface design, including bubble release, impact water electrolysis performance.
  • To develop a method for fabricating and testing electrodes with controlled extrinsic properties.

Main Methods:

  • Fabrication of electrodes using 3D printing and metal deposition.
  • Systematic assessment of electrode properties like wettability, roughness, and surface area.
  • Evaluation of hydrogen (HER) and oxygen evolution reactions (OER) performance, bubble dynamics, and stability.

Main Results:

  • Demonstrated a strong correlation between extrinsic electrode properties and electrochemical performance.
  • Showed that modifying electrode geometry, size, and flow rate affects overpotential and bubble behavior.
  • Confirmed the effectiveness of ordered, Ni-coated 3D porous structures for HER/OER and stability.

Conclusions:

  • Electrode architecture and electrolyte flow significantly influence bubble release and electrolysis efficiency.
  • 3D-printed electrodes offer a robust and controllable platform for evaluating electrocatalysts.
  • Tailoring electrode properties enables reproducible and comparable testing for water electrolysis materials.