Polybenzimidazole/Nafion hybrid membrane with improved chemical stability for vanadium redox flow battery application.

ABSTRACT: In order to increase the chemical stability of polybenzimidazole (PBI) membrane against the highly oxidizing environment of a vanadium redox flow battery (VRFB), PBI/Nafion hybrid membrane was developed by spray coating a Nafion ionomer onto one surface of the PBI membrane. The acid-base interaction between the sulfonic acid of the Nafion and the benzimidazole of the PBI created a stable interfacial adhesion between the Nafion layer and the PBI layer. The hybrid membrane showed an area resistance of 0.269 Ω cm² and a very low vanadium permeability of 1.95 × 10^-9 cm² min^-1. The Nafion layer protected the PBI from chemical degradation under accelerated oxidizing conditions of 1 M VO₂ ⁺/5 M H₂SO₄, and this

SUBMITTER: Ahn SM 

PROVIDER: S-EPMC9082649 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature