Cited by 276Fuel Cells and Related MaterialsElectrocatalysts for Energy ConversionAdvancements in Solid Oxide Fuel Cells

The Key to High Performance Low Pt Loaded Electrodes

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Orfanidi, A., Madkikar, P., El-Sayed, H. A., Harzer, G. S., Kratky, T., Gasteiger, H. A.·2017·Journal of The Electrochemical Society

Abstract

The effect of ionomer distribution on the oxygen mass transport resistance, the proton resistivity of the cathode catalyst layer, and the H 2 /air fuel cell performance was investigated for catalysts with surface modified carbon supports. By introducing nitrogen containing surface groups, it was shown that the ionomer distribution in the cathodic electrode can be optimized to decrease mass transport related voltage losses at high current density. The in house prepared catalysts were fully characterized by TEM, TGA, elemental analysis, and XPS. Thin-film rotating disk electrode measurements showed that the carbon support modification did not affect the oxygen reduction activity of the catalysts, but exclusively affects the ionomer distribution in the electrode during electrode preparation. Limiting current measurements were used to determine the pressure independent oxygen transport resistance – primarily attributed to oxygen transport in the ionomer film – which decreases for catalysts with surface modified carbon support. Systematically lowering the ionomer to carbon ratio (I/C) from 0.65 to 0.25 revealed a maximum performance at I/C = 0.4, where an optimum between ionomer thickness and proton conductivity within the catalyst layer is obtained. From this work, it can be concluded that not only ionomer film thickness, but more importantly ionomer distribution is the key to high performance low Pt loaded electrodes.

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Crossref · 10.1149/2.1621704jes

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48 of 48 references verified0 citation errors · 0 not checkable

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Authors
Orfanidi, A., Madkikar, P., El-Sayed, H. A., Harzer, G. S., Kratky, T., & Gasteiger, H. A.
Affiliations
Technical University of Munich (DE)
Venue
Journal of The Electrochemical Society
Published
2017
Volume
164
Issue
4
Pages
F418-F426
ISSN
  • 0013-4651 (ISSN-L)
  • 1945-7111
OpenAlex
W2592493147
Cited by
276
References
48
Citations by year
2026: 21 · 2025: 39 · 2024: 35 · 2023: 38 · 2022: 47 · 2021: 33 · 2020: 27 · 2019: 18 · 2018: 14 · 2017: 4
FWCI
7.16
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Journal of The Electrochemical Society (publishedVersion, cc-by)
  • mediaTUM – the media and publications repository of the Technical University Munich (Technical University Munich) (submittedVersion, other-oa)
Funders
Greenerity GmbH and German Federal Ministry of Economy (03ET2058C)
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
low platinum catalysts, oxygen reduction reaction, ionomer distribution, cathode catalyst layer, proton conductivity, nitrogen-doped carbon support, ionomer-to-carbon ratio, hydrogen-air fuel cells, voltage loss

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