Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 168, Issue 4, Pages -Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/abf4ab
Keywords
PEMFC catalyst durability; PtCo alloy cathode catalyst; PEMFC fabrication; Oxygen reduction reaction catalyst; Pt alloy catalyst inks
Funding
- U.S. Department of Energy, Energy Efficiency and Renewable Energy, Hydrogen and Fuel Cell Technologies Office
- Fuel Cell Performance and Durability (FC-PAD)
- Million Mile Fuel Cell Truck (M2FCT) consortia
- DOE Office of Science [DE-AC02-06CH11357]
- Department of Energy
- Argonne, a U.S. Department of Energy Office of Science laboratory [DE-AC02-06CH11357]
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The study revealed that cobalt loss from PtCo particles increased with higher water content in the inks, especially with 800 EW ionomer inks, leading to the formation of a new structure.
In this paper we report on studies of the effects of catalyst-ionomer ink composition: ionomer equivalent weight (EW), ink solvent, and ink mixing on a commercial PtCo alloy PEMFC cathode catalyst. X-ray absorption spectroscopy (XAS) and wide-angle X-ray scattering (WAXS) are utilized to determine catalyst atomic structure, catalyst crystallite composition, and extent of loss of Co into the ionomer-solvent phase. Three different n-propanol to water weight ratios (7:3, 5:5, and 3:7) and two different ionomers (3 M 800 EW and Nafion 1000 EW) were studied. Cobalt loss from the PtCo particles was found to increase with increasing water content in the inks and to be more extensive for the 800 EW ionomer inks, causing loss of contraction of the PtCo lattice and formation of a Pt shell-PtCo alloy core intraparticle structure.
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