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Elucidating the impact of the ionomer equivalent weight on a platinum group metal-free PEMFC cathode via oxygen limiting current

Journal Article · · SusMat (Online)
DOI:https://doi.org/10.1002/sus2.106· OSTI ID:1908040
Leveraging the interactions between ionomer and catalyst can increase the performance of proton exchange membrane fuel cells. The impacts of the equivalent weight (EW) of perfluorosulfonic acid–based ionomers on the platinum group metal-free electrode structure and fuel cell performance have not been fully explored. Four membrane electrode assemblies (MEAs) were prepared by using a commercial Fe–N–C catalyst, two perfluorosulfonic acid ionomers with different EWs, that is, Aquivion 720 (A720) and Nafion 1100 (N1100), and two ionomer-to-catalyst (I/C) ratios. The four MEAs were characterized to understand the impact of the ionomer EW and content on the capacitance, proton conductivity, and mass transport on the cathode. The mass transport resistance was measured for the first time using a new oxygen reduction reaction limiting current method enabling to couple the effects of oxygen diffusion with liquid water generation. Low EW ionomer combined with a moderate I/C results in improved performance due to its enhanced proton conductivity. However, when used at high I/C, it can cause severe water flooding at high current density due to the enhanced liquid water uptake, especially at high relative humidity, resulting in lower catalyst utilization and higher mass transport resistance.
Research Organization:
Argonne National Laboratory (ANL), Lemont, IL (United States); National Renewable Energy Laboratory (NREL), Golden, CO (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE Office of Science (SC)
Contributing Organization:
Electrocatalysis Consortium (ElectroCat)
Grant/Contract Number:
AC02-06CH11357; AC05-00OR22725; AC36-08GO28308
OSTI ID:
1908040
Alternate ID(s):
OSTI ID: 1959960
Report Number(s):
NREL/JA-5900-85471
Journal Information:
SusMat (Online), Journal Name: SusMat (Online) Journal Issue: 1 Vol. 3; ISSN 2692-4552
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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