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Mediated water electrolysis in biphasic systems.

Micheál D Scanlon1, Pekka Peljo2, Lucie Rivier2

  • 1The Bernal Institute and Department of Chemical Sciences, School of Natural Sciences, University of Limerick (UL), Limerick V94 T9PX, Ireland. micheal.scanlon@ul.ie.

Physical Chemistry Chemical Physics : PCCP
|August 19, 2017
PubMed
Summary
This summary is machine-generated.

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This study introduces efficient biphasic electrolysis for hydrogen production by combining electrochemical water splitting with light-driven reactions. A prototype H-cell demonstrated hydrogen gas evolution using a catalytic cycle at a water-organic interface.

Area of Science:

  • Electrochemistry
  • Renewable Energy
  • Catalysis

Background:

  • Efficient hydrogen production is crucial for renewable energy technologies.
  • Traditional water electrolysis often requires high overpotentials, reducing efficiency.
  • Biphasic systems offer potential for improved reaction kinetics and separation.

Purpose of the Study:

  • To introduce and demonstrate the concept of efficient photoelectrochemical biphasic electrolysis for hydrogen production.
  • To minimize overpotentials at both cathode and anode by incorporating light-driven elements.
  • To establish a viable electrochemical hydrogen production method using a polarized water-organic interface.

Main Methods:

  • Utilized a prototype H-cell with cathodic and anodic compartments for biphasic reactions.

Related Experiment Videos

  • Employed decamethylferrocenium cations ([Cp2*Fe(III)]+) reduction at the solid electrode/oil interface for electron transfer.
  • Investigated proton transfer across the water/oil interface using chronoamperometry, UV/vis spectroscopy, and gas chromatography.

    • Main Results:

    • Demonstrated electrochemical hydrogen (H2) production via a catalytic Electrochemical, Chemical, Chemical (ECC') cycle involving decamethylferrocene ([Cp2*Fe(II)]).
    • Confirmed stability and recyclability of the [Cp2*Fe(III)]+/Cp2*Fe(II) redox couple during biphasic electrolysis.
    • Enhanced hydrogen evolution reaction (HER) rate using catalytic molybdenum carbide (Mo2C) microparticles at the water/oil interface.

    Conclusions:

    • The developed biphasic electrolysis system efficiently produces hydrogen with minimized overpotentials.
    • The use of a superhydrophobic organic electrolyte salt is critical for effective proton transfer.
    • This work lays the foundation for photo-induced biphasic water electrolysis using metallocenes like decamethylrutheneocene (Cp2*Ru(II)).