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Achieving High‐Performance and 2000 h Stability in Anion Exchange Membrane Fuel Cells by Manipulating Ionomer Properties and Electrode Optimization
Author(s) -
Ul Hassan Noor,
Mandal Mrinmay,
Huang Garrett,
Firouzjaie Horie Adabi,
Kohl Paul A.,
Mustain William E.
Publication year - 2020
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.202001986
Subject(s) - materials science , ionomer , electrode , anode , electrolyte , cathode , membrane electrode assembly , membrane , power density , chemical engineering , proton exchange membrane fuel cell , ion , ion exchange , catalysis , copolymer , fuel cells , polymer , composite material , organic chemistry , chemistry , power (physics) , biochemistry , physics , quantum mechanics , engineering
The primary function of the ionomers that are incorporated into fuel cell electrode catalyst layers is to provide pathways for ion transport between the catalyst active sites and the electrolyte. This is influenced by many variables, including the ion‐exchange capacity, water uptake, and molecular weight. In anion exchange membrane fuel cells (AEMFCs), controlling ionomer water uptake is particularly important and tailoring this property in each electrode is an important consideration when looking to maximize cell performance. In this study, three poly(norbornene) tetrablock copolymer ionomers with a range of physical properties are synthesized and incorporated into AEMFC anode and cathode electrodes. Systematic electrode engineering with these ionomers allows the peak power density to be increased by 100% (1.6 W cm ‐2 → 3.2 W cm ‐2 ) and the current density at 0.2 V to be increased by 59% (5.9 A cm ‐2 → 9.4 A cm ‐2 ). Moreover, the top‐performing electrode configuration is tested in an operating AEMFC at the US Department of Energy defined current density of 600 mA cm ‐2 for 2000 h, showing a record‐low voltage decay rate of 15.36 µV h ‐1 – only 3.65% –a over 2000 h. This work sets a new bar for AEMFCs, reporting the best combination of performance and durability of any AEMFC to date.