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All-in-One Bipolar Membrane Electrode Assembly for Water Electrolysis.

Weisheng Yu1, Fen Luo1, Xiaojiang Li1

  • 1State Key Laboratory of Precision and Intelligent Chemistry, Department of Applied Chemistry, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, China.

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This study presents a new serial spraying method to create integrated bipolar membrane electrode assemblies for efficient green hydrogen production. The novel wrinkled design enhances water dissociation and stability in electrolyzers.

Keywords:
all-in-one configurationbipolar membraneintegrated interfacepure water electrolysisreaction and mass transfer enhancement

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Water dissociation (WD) at bipolar membrane (BPM) junctions is crucial for efficient green hydrogen production in water electrolyzers.
  • Current BPM-integrated membrane electrode assemblies (BPMEAs) suffer from low WD efficiency and poor stability.
  • These limitations hinder the practical application of BPMEAs in energy-efficient electrolysis.

Purpose of the Study:

  • To develop a novel, convenient fabrication method for all-in-one BPMEAs.
  • To enhance water dissociation efficiency and mass transport in BPM electrolyzers.
  • To improve the stability and energy efficiency of green hydrogen production.

Main Methods:

  • A serial spraying approach was employed to fabricate all-in-one BPMEAs.
  • The fabrication method created a wrinkled bipolar junction and integrated membrane/electrode interfaces.
  • The performance and durability of the fabricated BPMEAs were evaluated in water electrolysis.

Main Results:

  • The developed BPMEA exhibited enhanced WD efficiency and mass transport due to expanded active interfaces and a wrinkled architecture.
  • Competitive electrolyzer voltages were achieved: 3.25 V for pure water and 2.69 V for asymmetric acid/alkali electrolysis at 3000 mA cm-2.
  • Significant energy savings of 32% and 23% were realized, respectively. The wrinkled structure also provided improved durability.

Conclusions:

  • The serial spraying approach successfully produced all-in-one BPMEAs with enhanced performance and stability.
  • The wrinkled bipolar junction architecture is key to improving WD efficiency, mass transport, and durability.
  • This fabrication strategy offers a promising pathway for advancing BPM electrolyzers and other electrochemical applications.