Polybenzimidazole membranes for direct methanol fuel cell: Acid-doped or alkali-doped?

Long Yun Li, Bor Chern Yu, Chao Ming Shih, Shingjiang Jessie Lue*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

23 Scopus citations

Abstract

Polybenzimidazole (PBI) films immersed in 2 M phosphoric acid (H3PO4) or 6 M potassium hydroxide (KOH) solution form electrolytes for conducting proton or hydroxide, respectively. A direct methanol fuel cell (DMFC) with the alkali-KOH doped PBI gives 117.9 mW cm-2 of power output which is more than 2 times greater than the power density of 46.5 mW cm-2 with the H3PO4-doped PBI (vs.) when both of the DMFCs use a micro porous layer (MPL) in a gas-fed cathode and a MPL-free anode and are operated at 90 °C. When the MPL-free anode and cathode are used and the fuel flow rate is tripled, the peak power density of alkaline DMFC reaches 158.9 mW cm-2.

Original languageEnglish
Pages (from-to)386-395
Number of pages10
JournalJournal of Power Sources
Volume287
DOIs
StatePublished - 01 08 2015

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V.

Keywords

  • Micro porous layer (MPL)
  • Polybenzimidazole (PBI)
  • Power density

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