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Related Experiment Video

Updated: Sep 17, 2025

Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Highly Stable Polybenzimidazole Composite Membrane with a Durable Separation Layer by Interfacial Polymerization.

Congzhi Deng1,2, Zhenying Zheng3, Shengli Chen3

  • 1Division of Energy Storage, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

ACS Applied Materials & Interfaces
|July 3, 2025
PubMed
Summary

We developed a highly stable polybenzimidazole (PBI) thin-film composite (TFC) membrane for separations. This PBI-TFC membrane shows enhanced permeability, selectivity, and stability in harsh conditions, outperforming traditional polyamide membranes.

Keywords:
high stabilityinterface dispersitypolybenzimidazolethin-film composite membranevanadium flow battery

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Polymer Chemistry

Background:

  • Thin-film composite (TFC) membranes are crucial for separations but polyamide-TFC membranes lack stability.
  • Hydrolysis of amido bonds limits the application of polyamide membranes in acidic or alkaline environments.

Purpose of the Study:

  • To develop a highly stable polybenzimidazole (PBI)-TFC membrane.
  • To enhance the permeability, selectivity, and stability of TFC membranes for demanding applications.

Main Methods:

  • Interfacial condensation between 3,3'-diaminobenzidine (DAB) and benzene-1,3,5-tricarbaldehyde (BTA) to form PBI.
  • Controlled pH to optimize DAB dispersity and PBI film formation.
  • Characterization of PBI-TFC membrane properties and performance in vanadium flow batteries.

Main Results:

  • A dense and thin PBI film (approx. 296 nm) was formed via optimized interfacial condensation.
  • The PBI-TFC membrane exhibited excellent permeability (2.27 × 10⁻⁶ cm²/h) and selectivity (area resistance: 0.11 Ω cm²).
  • The membrane maintained structural integrity in strongly acidic and oxidizing conditions.

Conclusions:

  • The PBI-TFC membrane offers superior stability, permeability, and selectivity compared to conventional polyamide membranes.
  • The PBI-TFC membrane demonstrated high energy efficiency (>80% at 160 mA cm⁻²) and stability (>300 cycles) in acidic vanadium flow batteries.
  • This study presents an effective strategy for designing robust TFC membranes.