Effects of Loading and Nafion Content on the Activity and Stability of Iridium Oxygen Evolution Reaction Catalysts
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F25%3A10510606" target="_blank" >RIV/00216208:11320/25:10510606 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=iPXQ2wLblr" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=iPXQ2wLblr</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1149/1945-7111/ae1168" target="_blank" >10.1149/1945-7111/ae1168</a>
Alternative languages
Result language
angličtina
Original language name
Effects of Loading and Nafion Content on the Activity and Stability of Iridium Oxygen Evolution Reaction Catalysts
Original language description
Iridium (Ir) is the benchmark catalyst for the oxygen evolution reaction (OER) in proton-exchange-membrane water electrolyzers, yet its scarcity demands rigorous, reproducible benchmarking in aqueous model systems. We systematically vary catalyst loading and Nafion ionomer content to probe how ink formulation governs the activity-stability trade-off for two Ir phases: metallic Ir and IrO2. OER activity and Ir dissolution are monitored simultaneously using online inductively coupled plasma mass spectrometry, and the catalyst-ionomer interface is characterized by electron microscopy and X-ray photoelectron spectroscopy. Our results show that catalyst loading has no effect on Ir dissolution, while ionomer content is the dominant and phase-dependent parameter: on metallic Ir, increasing Nafion lowers activity with no effect on dissolution, while for IrO2, it increases both activity and dissolution. These opposing trends are consistent with ionomer-induced changes in interfacial structure, oxidation state, particle dispersion, and accessible active area. Our study shows that ionomer content and catalyst phase must be carefully controlled and reported when benchmarking Ir-based OER catalysts, and provides practical guidelines to balance performance while minimizing precious-metal loss.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of the Electrochemical Society
ISSN
0013-4651
e-ISSN
1945-7111
Volume of the periodical
172
Issue of the periodical within the volume
10
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
106506
UT code for WoS article
001598184600001
EID of the result in the Scopus database
2-s2.0-105019713273