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Energies 2014, 7(3), 1721-1732; doi:10.3390/en7031721
Article

Preparation of Polybenzimidazole-Based Membranes and Their Potential Applications in the Fuel Cell System

1
, 2
, 3
 and 1,*
Received: 7 November 2013; in revised form: 24 February 2014 / Accepted: 5 March 2014 / Published: 24 March 2014
(This article belongs to the Special Issue Polymer Electrolyte Membrane Fuel Cells)
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Abstract: Various polybenzimidazole (PBI)-based ion-exchange films were prepared and thoroughly characterized by Fourier transform infrared (FT-IR) spectroscopy, proton conductivity, and water uptake for possible use as fuel cell membranes. Upon the increase in the flexibility of the PBI-based polymer films (e.g., poly(oxyphenylene benzimidazole) (OPBI) and sulfonated OPBI (s-OPBI)), the membranes exhibited slightly improved proton conductivity, but significantly increased dimensional changes. To reduce the dimensional changes (i.e., increase the stability), the cross-linking of the polymer films (e.g., cross-linked OPBI (c-OPBI) and sulfonated c-OPBI (sc-OPBI)) was accomplished using phosphoric acid. Interestingly, the sc-OPBI membrane possessed a greatly increased proton conductivity (0.082 S/cm), which is comparable to that of the commercially available Nafion membrane (0.09 S/cm), while still maintaining slightly better properties regarding the dimensional change and water uptake than those of the Nafion membrane.
Keywords: polybenzimidazole (PBI); flexible PBI; cross-linked PBI; proton exchange membrane fuel cell (PEMFC) polybenzimidazole (PBI); flexible PBI; cross-linked PBI; proton exchange membrane fuel cell (PEMFC)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Hwang, K.; Kim, J.-H.; Kim, S.-Y.; Byun, H. Preparation of Polybenzimidazole-Based Membranes and Their Potential Applications in the Fuel Cell System. Energies 2014, 7, 1721-1732.

AMA Style

Hwang K, Kim J-H, Kim S-Y, Byun H. Preparation of Polybenzimidazole-Based Membranes and Their Potential Applications in the Fuel Cell System. Energies. 2014; 7(3):1721-1732.

Chicago/Turabian Style

Hwang, Kyungho; Kim, Jun-Hyun; Kim, Sung-Yul; Byun, Hongsik. 2014. "Preparation of Polybenzimidazole-Based Membranes and Their Potential Applications in the Fuel Cell System." Energies 7, no. 3: 1721-1732.


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