Fuel cell based on novel hyper-branched polybenzimidazole membrane

Changzhi Liu, Sher Bahadar Khan, Minju Lee, Kwang In Kim, Kalsoom Akhtar, Haksoo Han, Abdullah M. Asiri

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


A novel hyper-branched polybenzimidazole (HB-PBI) has been synthesized and efficiently utilized as a conducting polymer for the fabrication of an efficient high temperature fuel cell. The developed fuel cell showed outstanding proton conductivity (0.168 Scm-1 at 150 °C) along with excellent single cell performance, displaying a maximum power density of 0.346 Wcm-2. The HB-PBI has been synthesized by polymerization of bibenzimidazole diterephthalic acid (BBIDTA) and 3,3′-diaminobenzene in the presence of poly phosphoric acid while the BBIDTA was synthesized by treating trimellitic anhydride with 3,3′-diaminobenzene. Both HB-PBI and BBIDTA were structurally characterized by nuclear magnetic resonance (1H and 13C NMR). HB-PBI showed high thermal stability and mechanical properties, findings that were corroborated by thermogravimetric analysis and use of a universal testing machine. Additionally, proton conduction and the thermal and mechanical properties of HB-PBI were compared with polybenzene imidazole (m-PBI), and found that HB-PBI has higher proton conducting, thermal and mechanical properties.

Original languageEnglish
Pages (from-to)35-41
Number of pages7
JournalMacromolecular Research
Issue number1
Publication statusPublished - 2013 Jan

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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