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Updated: May 26, 2026
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On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method
Published on: March 16, 2018
Preparation and fuel cell performance of catalyst layers using sulfonated polyimide ionomers.
Takuya Omata1, Manabu Tanaka, Kenji Miyatake
1Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4 Takeda, Kofu 400-8510, Japan.
ACS Applied Materials & Interfaces
|December 29, 2011
Summary
Sulfonated polyimide ionomers show good anode performance in fuel cells, but cathode performance depends heavily on ionomer properties and humidity. Optimizing water management and ionomer characteristics is key for effective fuel cell operation.
Area of Science:
- Electrochemistry
- Materials Science
- Polymer Science
Background:
- Sulfonated polyimide (SPI-8) ionomers are investigated as binders in catalyst layers for fuel cell applications.
- Understanding ionomer behavior is crucial for optimizing fuel cell efficiency and durability.
Purpose of the Study:
- To evaluate the fuel cell performance of sulfonated polyimide (SPI-8) ionomers as binders in catalyst layers.
- To investigate the impact of ionomer properties (molecular weight, content) and operating conditions (humidity) on fuel cell performance.
Main Methods:
- Fabrication and testing of membrane electrode assemblies (MEAs) using SPI-8 ionomers in catalyst layers.
- Performance evaluation under varying relative humidity (RH) levels (50%, 80%, 100%).
- Analysis of anode and cathode performance, including overpotential, potential drop, and current density.
Main Results:
- SPI-8 ionomers performed well at the anode with minimal overpotential, even at low humidity (50% RH).
- Cathode performance was sensitive to ionomer molecular weight and content, and gas humidity, with higher molecular weight/content leading to performance issues at high humidity.
- Increased ionomer content and molecular weight at high RH caused insufficient oxygen supply and water discharge due to swelling, leading to potential drop.
- Mass transport improved with decreased humidity, but proton conductivity decreased.
Conclusions:
- Careful optimization of oxygen supply, proton conductivity, and water management (uptake and discharge) in catalyst layers is essential for achieving good cathode performance with hydrocarbon ionomers.
- Different operating conditions may be optimal for the anode and cathode when using SPI-8 ionomers.
