Spatially Resolved Performance and Degradation in a Perfluorinated Anion Exchange Membrane Fuel Cell

Ashutosh Divekar, Michael Gerhardt, Christopher Antunes, Luigi Osmieri, Ami Yang-Neyerlin, Adam Weber, Bryan Pivovar, Guido Bender, Andrew Herring

Research output: Contribution to journalArticlepeer-review

7 Scopus Citations

Abstract

Anion exchange membrane fuel cells may enable future operation with non-precious metal-based catalysts. These systems have a delicate sensitivity to operating conditions such as humidification levels and the presence of CO2 in the air oxidant stream. We present spatially resolved in-situ performance results that shed light on phenomena that are unique to anion exchange membrane fuel cells. For cell construction, a highly conductive perfluorinated anion exchange polymer was used as the membrane and the material in powder form as the ionomer. Experiments were conducted to investigate the effects of humidification, fuel/oxidant concentration, and carbonation effects on the performance and its distribution in the cell. The results indicated that (i) dry conditions at the cathode have a stronger effect than at the anode on overall cell performance, (ii) performance significantly suffered when humidification was below 90%, (iii) fuel and oxidant dilution effects lead mass-transport losses and were stronger than flow rate effects, (iv) CO2 in the cathode feed stream creates an equilibration disparity between the inlet and outlet sections and CO2 purging is affected by flooding conditions, and (v) after >500 h of operation, performance deteriorates predominantly at the inlet.

Original languageAmerican English
Article number139812
Number of pages14
JournalElectrochimica Acta
Volume406
DOIs
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

NREL Publication Number

  • NREL/JA-5900-77132

Keywords

  • 2+1D fuel cell model
  • Anion Exchange membranes
  • Cathode dry-out
  • CO poisoning
  • Fuel cell durability
  • Mass transport limitations
  • Segmented fuel cell

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