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ECS Meeting Abstracts, 13(MA2012-02), p. 1510-1510, 2012

DOI: 10.1149/ma2012-02/13/1510

The Electrochemical Society, ECS Transactions, 2(50), p. 1155-1165, 2013

DOI: 10.1149/05002.1155ecst

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Thermogravimetric and Spectroscopic Investigation of the Interaction between Polybenzimidazole and Phosphoric Acid

Journal article published in 2013 by Anne Majerus, A. Majerusa, Fosca Conti, Carsten Korte, Werner Lehnert ORCID, Detlef Stolten
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Poly(2,5-benzimidazole) (ABPBI) doped with different acid concentrations were analyzed by means of conductivity and thermogravimetric measurements as well as Raman spectroscopy. The conductivity is measured as a function of temperature and relative humidity. The condensation of the phosphoric acid can be observed in the signal of the proton conductivity under dry conditions. Raman spectroscopic measurements of variously doped membranes are performed to investigate the ABPBI - phosphoric acid interactions. The results are correlated to those obtained from the conductivity measurements. The dehydration of the acid is confirmed by thermogravimetric analysis of pure phosphoric acid and doped ABPBI.