New & Alternative Chemistries

Selective Ion Transport Through Hydrated Micropores In Polymer Membranes

Among fabricated polymers, carboxylated polymers of intrinsic microporosity with phenyl groups (cPIMPh), with a pore gate size of 5.0 0.3 Å, strike the best balance between high ion conductivity and low permeability to redox-active species.

cPIMPh outperforms Nafion 212 and sPEEK, offering superior energy efficiency across a wide range of current densities, higher peak power density, and lower interfacial resistance.

In AORBF applications, capacity delay was reduced to 0.014%/day, cycling for 1,000 hours.

Excessive swelling in hydrated states compromises the selectivity and conductivity of separatory membranes in aqueous organic redox flow batteries AORBF. Wang et al. address this by tuning the hydrophilicity and rigidity of pores in various fabricated polymers.

Source: Wang et al. Nature, 2024

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