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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Transparent Bipolar Membrane for Water Splitting Applications.

Sakineh Chabi1, Andrew G Wright2, Steven Holdcroft2

  • 1Department of Chemistry, Florida Institute of Technology, 150 West University Boulevard , Melbourne, Florida 32901, United States.

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|August 2, 2017
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Summary
This summary is machine-generated.

Researchers developed novel bipolar membranes using benzimidazolium anion exchange membranes for efficient solar water splitting. These membranes exhibit excellent conductivity and light transmittance, enhancing water dissociation for sustainable hydrogen production.

Keywords:
artificial photosynthesisbipolar membraneinterfacial layertransparent membranewater splitting

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Renewable Energy

Background:

  • Bipolar membranes are crucial for electrochemical processes like water splitting.
  • Developing efficient and stable bipolar membranes is key for advancing renewable energy technologies.
  • Benzimidazolium-based anion exchange membranes offer potential for improved membrane performance.

Purpose of the Study:

  • To investigate the use of benzimidazolium-based anion exchange membranes for creating bipolar membranes.
  • To assess the suitability of these bipolar membranes for solar-driven water splitting applications.
  • To evaluate the performance characteristics, including ion conductivity and optical properties.

Main Methods:

  • Fabrication of bipolar membranes by laminating benzimidazolium-based anion exchange membranes with Nafion NR-211.
  • Measurement of proton and hydroxide ion conductivities under acidic and basic conditions.
  • Assessment of optical transmittance and membrane thickness.

Main Results:

  • Achieved proton and hydroxide ion conductivities of 103 and 102 mS cm⁻¹, respectively.
  • Fabricated bipolar membranes with an average thickness of 90 μm.
  • Demonstrated high visible light transmittance (up to 75%) and a sharp hydrophilic interface.

Conclusions:

  • The benzimidazolium-based bipolar membranes show significant potential for solar-driven water splitting.
  • The sharp interface and resulting electric field effectively enhance water dissociation.
  • These findings pave the way for more efficient and cost-effective hydrogen production.