Degradation of Platinum-Cobalt Alloy PEMFC Cathode Catalysts in Catalyst-Ionomer Inks
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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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In a representative Pt-Co alloying catalyst ink, applying a low equivalent weight ionomer causes more loss of Co and of lattice contraction compared to Nafion ionomer.
“For example, in the representative Pt-Co alloying catalyst ink, applying a low EW ionomer causes more loss of Co and of lattice contraction compared to Nafion ionomer [184].”
From Recent Advances on PEM Fuel Cells: From Key Materials to Membrane Electrode Assembly (2023) · cites this paper as [184]
Cites
Sui, S., Wang, X., Zhou, X., Su, Y., Riffat, S., & Liu, C.-J. (2017) · Journal of Materials Chemistry A · doi:10.1039/c6ta08580f · Cited by 916 · see citing works
Chen, S., Gasteiger, H. A., Hayakawa, K., Tada, T., & Shao-Horn, Y. (2010) · Journal of The Electrochemical Society · doi:10.1149/1.3258275 · Cited by 360 · see citing works
Van Cleve, T., Wang, G., Mooney, M., Cetinbas, C. F., Kariuki, N., Park, J., Farghaly, A., Myers, D., & Neyerlin, K. C. (2021) · Journal of Power Sources · doi:10.1016/j.jpowsour.2020.228889 · Cited by 66 · see citing works
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Recent Advances on PEM Fuel Cells: From Key Materials to Membrane Electrode Assembly
Mo, S., Du, L., Huang, Z., Chen, J., Zhou, Y., Wu, P., Meng, L., Wang, N., Xing, L., Zhao, M., et al. (2023) · Electrochemical Energy Reviews · doi:10.1007/s41918-023-00190-w · Cited by 277 · see citing works
“For example, in the representative Pt–Co alloying catalyst ink, applying a low EW ionomer causes more loss of Co and of lattice contraction compared to Nafion ionomer [184].”
- Authors
- Myers, D. J., Kropf, A. J., Wegener, E. C., Mistry, H., Kariuki, N., & Park, J.
- Affiliations
- Argonne National Laboratory (US)
- Corresponding author
- Myers, Deborah J.
- Venue
- Journal of The Electrochemical Society
- Publisher
- The Electrochemical Society
- Published
- 2021-04-01
- Volume
- 168
- Issue
- 4
- Pages
- 044510
- ISSN
- 0013-4651 (ISSN-L)
- 1945-7111
- OpenAlex
- W3141037511
- Cited by
- 32
- References
- 3
- Citations by year
- 2026: 5 · 2025: 9 · 2024: 8 · 2023: 3 · 2022: 6 · 2021: 1
- FWCI
- 1.32
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of The Electrochemical Society (publishedVersion, cc-by-nc-nd)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- Funders
- U.S. Department of Energy, Energy Efficiency and Renewable Energy, Hydrogen and Fuel Cell Technologies Office.
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Fuel Cells and Related Materials
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Electrocatalysts for Energy Conversion
- Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
- Keywords
- catalyst deactivation, cobalt leaching, lattice contraction, Nafion, ink mixing
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