Temperature-induced shear-thinning in catalyst inks
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Temperature is a key parameter for ionomer adsorption on carbon supports in catalyst inks for fuel cells, and thus it affects the properties of the ink. This study aimed to investigate the temperature-induced structural evolution and viscosity transition in a catalyst ink. The effect of temperature on the nanostructures of the catalyst ink fabricated from surface-modified carbon supports without platinum nanoparticles was investigated using contrast-variation small-angle neutron scattering (CV-SANS) analysis, through which the concentration and thickness of the adsorbed ionomer layer on the surface of carbon were evaluated. The CV-SANS analysis revealed that the thickness of the shell ionomer layer at 70 °C was twice that at 25 °C, while at elevated temperatures the catalyst ink exhibited shear-thinning behavior. It was surmised that plausible factors in the shear-thinning behavior were a reduction in electrostatic repulsion and the appearance of bridging attraction. Our findings indicate that temperature is a key parameter in the fabrication of catalyst inks, which may be overlooked during the formulation of catalyst inks and catalyst layers.
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Preparing the catalyst ink in an ice bath is preferred due to the shear-thinning behavior at elevated temperatures.
“It is preferred to prepare the catalyst ink in an ice bath due to the shear-thinning behavior at elevated temperatures [188].”
From Recent Advances on PEM Fuel Cells: From Key Materials to Membrane Electrode Assembly (2023) · cites this paper as [188]
Cites
The Key to High Performance Low Pt Loaded Electrodes
Orfanidi, A., Madkikar, P., El-Sayed, H. A., Harzer, G. S., Kratky, T., & Gasteiger, H. A. (2017) · Journal of The Electrochemical Society · doi:10.1149/2.1621704jes · Cited by 276 · see citing works
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The importance of ultrasonic parameters in the preparation of fuel cell catalyst inks
Pollet, B. G., & Goh, J. T. E. (2014) · Electrochimica Acta · doi:10.1016/j.electacta.2013.09.160 · Cited by 117 · see citing works
Understanding inks for porous-electrode formation
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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
“It is preferred to prepare the catalyst ink in an ice bath due to the shear-thinning behavior at elevated temperatures [188].”
- Authors
- Yoshimune, W., & Harada, M.
- Affiliations
- Toyota Central Research and Development Laboratories (Japan) (JP)
- Corresponding author
- Yoshimune, Wataru
- Venue
- Electrochemistry Communications
- Publisher
- Elsevier BV
- Published
- 2021-09
- Volume
- 130
- Pages
- 107099
- ISSN
- 1388-2481 (ISSN-L)
- OpenAlex
- W3184131807
- Cited by
- 22
- References
- 4
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 6 · 2023: 3 · 2022: 5 · 2021: 1
- FWCI
- 1.10
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Electrochemistry Communications (publishedVersion, cc-by-nc-nd)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- 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 › Advancements in Solid Oxide Fuel Cells
- Keywords
- catalyst ink, shear thinning, temperature effects, ionomer adsorption, carbon support, fuel cell catalyst layers, electrostatic repulsion, platinum-free catalysts
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