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

作者：Song, Feifei; Fu, Yishu; Gao, Ying; Li, Jiadong; Qiao, Jinli^*; Zhou, Xiao-Dong; Liu, Yuyu

来源：Electrochimica Acta, 2015, 177: 137-144.

DOI：10.1016/j.electacta.2015.02.015

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

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 (sigma(OH-)), 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 H-2/O-2 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 degrees C. The CS/EMImC-Co-EP membranes show excellent thermal stability with onset degradation temperature high above 200 degrees C. In particular, the high alkaline stability is achieved for the CS/EMImC-Co-EP membranes in hot 8.0 M KOH at 85 degrees 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 H-2 as the fuel and O-2 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.

• 出版日期2015-9-20
• 单位东华大学