How Amphion™ works

Your first amphoteric membrane

Amphion™ goes beyond the distinction bewteen cation or anion exchange membrane. Our amphoteric membranes contain exactly the right amount of cation and anion exchange groups to maximise the performance of your systems.


Read on to learn how Amphion™ increases the charge-discharge efficiency of Vanadium redox flow batteries by up to 20%.

The ideal membrane for Vanadium redox flow batteries

Cation exchangers

High conductivity but high crossover

Cation exchange groups facilitate the transport of protons, but at the same time offer a poor barrier against the crossover of Vanadium ions. Hence cation exchange membranes lead to high coulombic losses and capacity fading.

Anion exchangers

Low crossover but poor conductivity

Anion exchange groups offer a barrier to the crossover of Vanadium ions, but also cause greater resistance to the transport of protons. Hence what is gained in coulombic efficiency is lost due to the higher voltaic losses. 


High conductivity and low crossover

Our amphoteric membranes are cleverly crafted to contain the perfect balance of cation and anion exchange groups. This way, Amphion™ offers both high proton conductivity and the strongest barrier to Vanadium crossover.

Now that you know how Amphion™ works why not have a look at our Products?

©2019 Gaia Membranes AG.