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This study introduces a novel membrane-free system for continuous green hydrogen production via water splitting. It achieves over 99.9% pure hydrogen using a unique cable-car electrode design in separate tanks.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Growing demand for clean energy drives interest in electrolytic water splitting for hydrogen production.
  • Simultaneous hydrogen and oxygen generation complicates pure hydrogen extraction without membranes.
  • Existing methods often require complex ionic conducting membranes, increasing cost and limiting scalability.

Purpose of the Study:

  • To develop a novel, continuous, membrane-free water splitting process for high-purity hydrogen production.
  • To demonstrate a scalable system for industrial green hydrogen generation.
  • To overcome the limitations of traditional electrolytic cells in separating hydrogen and oxygen.

Main Methods:

  • A continuous roll-to-roll process was developed for water electrolysis.
  • Specially designed "cable-car" electrodes (CCE) were utilized to shuttle between separate hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) tanks.
  • The system operated in two distinct electrolyte tanks to decouple the reactions.

Main Results:

  • Achieved continuous hydrogen production with purity exceeding 99.9%.
  • Demonstrated high Coulombic efficiency of 98% over prolonged operation.
  • Successfully decoupled hydrogen and oxygen evolution reactions without ionic conducting membranes.

Conclusions:

  • The novel membrane-free system offers a promising pathway for cost-effective, industrial-scale green hydrogen production.
  • The roll-to-roll process and CCE design simplify the system, reducing complexity and cost.
  • This approach facilitates the integration of renewable energy sources for sustainable hydrogen generation, lowering the carbon footprint.