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Updated: Jul 8, 2026
08:09
A Micro-agar Salt Bridge Electrode for Analyzing the Proton Turnover Rate of Recombinant Membrane Proteins
Published on: January 7, 2019
Bipolar Palladium Membrane Enabling Crossover-Free Selective Proton Transport
Jiyeon Baek1,2, Yeongbae Jeon3, Seunga Lee1
1Clean Fuel Research Laboratory, Korea Institute of Energy Research, Daejeon, Republic of Korea.
Summary
Researchers developed a novel palladium membrane for electrochemical devices. This membrane achieves high proton selectivity, overcoming limitations of conventional materials and enabling efficient, stable operation.
Area of Science:
- Electrochemistry
- Materials Science
- Chemical Engineering
Background:
- Achieving proton-selective membranes is crucial for efficient electrochemical devices.
- Conventional membranes face a conductivity-selectivity trade-off due to water-mediated proton transport.
- This limits crossover-free proton transport and device stability.
Purpose of the Study:
- To introduce a novel proton shuttling mechanism using a bipolar palladium membrane.
- To overcome the inherent conductivity-selectivity trade-off in conventional membranes.
- To enable stable electrochemical systems requiring strict compartmentalization.
Main Methods:
- Demonstrated a bipolar electrochemical proton absorption and desorption mechanism.
- Utilized lattice-channeled hydrogen diffusion within palladium.
- Constructed a water-fed Li-mediated N2 reduction system using the palladium membrane.
Main Results:
- The bipolar palladium membrane circumvents the conductivity-selectivity relationship.
- Water crossover was suppressed between aqueous and non-aqueous electrolytes under continuous flow.
- Achieved 51% ammonia Faradaic efficiency and 12 h stable operation.
Conclusions:
- Introduced a new ion transport mechanism via bipolar palladium membranes.
- Expanded design possibilities for next-generation electrochemical systems.
- Enabled water as a sustainable proton source in a compartmentalized system.
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