Exploring backbone-cation alkyl spacers for multi-cation side chain anion exchange membranes

JOURNAL OF POWER SOURCES

卷:375

Article

Zhu, Liang¹  Yu, Xuedi¹  Hickner, Michael A.^1,2 

[1] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[2] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA

关键词: Anion exchange membrane;    Fuel cell;    Membrane;    Multi-cation;    Conductivity;    Stability;   

DOI  :  10.1016/j.jpowsour.2017.06.020

来源: Elsevier

【 摘 要 】

In order to systematically study how the arrangement of cations on the side chain and length of alkyl spacers between cations impact the performance of multi-cation AEMs for alkaline fuel cells, a series of polyphenylene oxide (PPO)-based AEMs with different cationic side chains were synthesized. This work resulted in samples with two or three cations in a side chain pendant to the PPO backbone. More importantly, the length of the spacer between cations varied from 3 methylene (-CH2-) (C3) groups to 8 methylene (C8) groups. The highest conductivity, up to 99 mS/cm in liquid water at room temperature, was observed for the triple-cation side chain AEM with pentyl (C5) or hexyl (C6) spacers. The multi cation AEMs were found to have decreased water uptake and ionic conductivity when the spacer chains between cations were lengthened from pentyl (C5) or hexyl (C6) to octyl (C8) linking groups. The triple-cation membranes with pentyl (C5) or hexyl (C6) groups between cations showed greatest stability after immersion in 1 M NaOH at 80 degrees C for 500 h. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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