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On the design of a comb-shaped, poly(phenylene oxide)-based anodic binder for anion-exchange membrane direct methanol fuel cell (AEM-DMFC)

: Jurzinsky, T.; Bär, R.; Heppe, N.; Kübler, M.; Jung, F.; Cremers, C.; Tübke, J.


Jones, D.J. ; Electrochemical Society -ECS-:
Polymer Electrolyte Fuel Cells, PEFC 2016 : PRiME 2016/230th ECS Meeting, October 2, 2016 - October 7, 2016, Honolulu, Hawaii
Pennington, NJ: ECS, 2016 (ECS transactions 75.2016, Nr.14)
Symposium on Polymer Electrolyte Fuel Cells (PEFC) <16, 2016, Honolulu/Hawaii>
Pacific Rim Meeting on Electrochemical and Solid-State Science (PRiME) <2016, Honolulu/Hawaii>
Electrochemical Society (Meeting) <230, 2016, Honolulu/Hawaii>
Fraunhofer ICT ()

In this study, we present the synthesis of a poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) based comb-like ionomer and the characterization of this ionomer. The ionomer consists of a PPO backbone and a partially fluorinated cationic sidechain. The comb-like ionomer showed high stability regarding ionic conductivity and ion exchange capacity in alkaline media. Besides this, a low swelling ratio for 4M methanol anodic fuel was found for the ionomer making it a suitable candidate for an application in the anodic catalyst layer in AEM-DMFCs. Evaluation of the methanol diffusion with a mass exchanger unit coupled to a mass spectrometer showed that the partially fluorinated sidechain lowers methanol diffusion compared to a non-fluorinated ionomer. Nevertheless, the comb-like ionomer was implemented in single cells as a catalyst binder and provided strong enhancement in single cell performance when the cell was run with KOH-free anodic fuel.