Novel Alkaline Anion-exchange Membranes Based on Chitosan/Ethenylmethylimidazoliumchloride Polymer with Ethenylpyrrolidone Composites for Low Temperature Polymer Electrolyte Fuel Cells

Feifei Song, Yishu Fu, Ying Gao, Jiadong Li, Jinli Qiao, Xiao Dong Zhou, Yuyu Liu

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Novel alkaline anion-exchange membranes composed of chitosan (CS) and 1-Ethenyl-3-methyl-1H-imidazoliumchloride polymer with 1-ethenyl-2-pyrrolidone (abbreviated as EMImC-Co-EP) are prepared by a combined thermal and chemical cross-linking technique. The hydroxide conductivity (σOH-), water uptakes, ion exchange capacity (IEC), thermal stability, mechanical property, oxidative stability and alkaline stabilities of CS/EMImC-Co-EP membranes are measured to evaluate their applicability in H2/O2 alkaline fuel cells (FC). The effects of thermal cross-linking temperature and membrane composition on membrane OH- conductivity are studied using AC impedance technique. FTIR, SEM and TG analysis are used for structural characterization of these membranes. It is found that the OH- conductivity of the membranes increases with temperature and exceeds 10-2 S cm-1 at 80 °C. The CS/EMImC-Co-EP membranes show excellent thermal stability with onset degradation temperature high above 200 °C. In particular, the high alkaline stability is achieved for the CS/EMImC-Co-EP membranes in hot 8.0 M KOH at 85 °C without losing their integrity and OH- conductivity during 300 hours of evaluation, and also a relatively high oxidative stability. The membrane electrode assembly (MEA) fabricated with CS/EMImC-Co-EP (1:0.5 by mass) gives an initial power density of 21.7 mW cm-2 using H2 as the fuel and O2 as oxidant at room temperature, on a low metal loading on both the anode and the cathode of 0.5 mg (Pt) cm-2 at ambient temperature.

Original languageEnglish
Article number24285
Pages (from-to)137-144
Number of pages8
JournalElectrochimica Acta
Volume177
DOIs
Publication statusPublished - 2015 Sep 20

Keywords

  • Alkaline anion exchange membrane
  • Combined cross-linking
  • Hydroxide conductivity
  • Membrane electrode assembly
  • Stability

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Fingerprint Dive into the research topics of 'Novel Alkaline Anion-exchange Membranes Based on Chitosan/Ethenylmethylimidazoliumchloride Polymer with Ethenylpyrrolidone Composites for Low Temperature Polymer Electrolyte Fuel Cells'. Together they form a unique fingerprint.

Cite this