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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

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 the...
Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct microscopic...
Facilitated Diffusion01:16

Facilitated Diffusion

The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...
The Significance of Membrane Transport01:44

The Significance of Membrane Transport

The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
ATP Driven Pumps I: An Overview01:27

ATP Driven Pumps I: An Overview

ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and are...
The ADP/ATP Carrier Protein01:42

The ADP/ATP Carrier Protein

ADP/ATP carrier or AAC protein is the most abundant carrier protein in the inner mitochondrial membrane. It transports large quantities of ADP and ATP, equivalent to the average human body weight, every day. Among other transporters, ACC protein is one of the best-studied members of the mitochondrial carrier protein family. The ADP/ATP carrier protein comprises two transmembrane helices connected to a loop and a single alpha-helix on the matrix side. It switches between two conformational...

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Updated: Jul 8, 2026

A Micro-agar Salt Bridge Electrode for Analyzing the Proton Turnover Rate of Recombinant Membrane Proteins
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.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|July 6, 2026
PubMed
Summary
This summary is machine-generated.

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.

Keywords:
electrochemistryion transportermaterials sciencemembraneproton transport

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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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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

Published on: February 23, 2017

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Last Updated: Jul 8, 2026

A Micro-agar Salt Bridge Electrode for Analyzing the Proton Turnover Rate of Recombinant Membrane Proteins
08:09

A Micro-agar Salt Bridge Electrode for Analyzing the Proton Turnover Rate of Recombinant Membrane Proteins

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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
08:06

Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone

Published on: February 23, 2017

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.