Journal
ELECTROCHIMICA ACTA
Volume 277, Issue -, Pages 151-160Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.04.137
Keywords
AEMFC; Electrode performance; Electrode morphology; Ionomer content; Pt/C catalyst
Categories
Funding
- Swedish Vehicle Research and Innovation program - Swedish Energy Agency
- governmental initiative StandUp for Energy
- IRES program through the National Science Foundation [NSF-OISE-1358179]
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A deeper understanding of porous electrode preparation and performance losses is necessary to advance the anion exchange membrane fuel cell (AEMFC) technology. This study has investigated the performance losses at 50 degrees C for varied: Tokuyama AS-4 ionomer content in the catalyst layer, Pt/C loading and catalyst layer thickness at the anode and cathode, relative humidity, and anode catalyst. The prepared gas diffusion electrodes in the interval of ionomer-to-Pt/C weight ratio of 0.4-0.8 or 29-44 wt% ionomer content show the highest performance. Varying the loading and catalyst layer thickness simultaneously shows that both the cathode and the anode influence the cell performance. The effects of the two electrodes are shown to vary with current density and this is assumed to be due to non-uniform current distribution throughout the electrodes. Further, lowering the relative humidity at the anode and cathode separately shows small performance losses for both electrodes that could be related to lowered ionomer conductivity. Continued studies are needed to optimize, and understand limitations of, each of the two electrodes to obtain improved cell performance. (c) 2018 Elsevier Ltd. All rights reserved.
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