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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

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Sulfonated poly(arylene ether sulfone ketone) multiblock copolymers with highly sulfonated block. Fuel cell

Byungchan Bae¹, Takeshi Yoda, Kenji Miyatake

¹Fuel Cell Nanomaterials Center, University of Yamanashi, 4 Takeda, Kofu 400-8510, Japan.

The Journal of Physical Chemistry. B

|August 13, 2010

Summary

New sulfonated poly(arylene ether sulfone ketone) (SPESK) copolymers show promise for fuel cells. An all-SPESK membrane electrode assembly (MEA) operates at higher temperatures, demonstrating potential for advanced energy applications.

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Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification

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Area of Science:

Materials Science
Electrochemistry
Polymer Chemistry

Background:

Proton exchange membranes (PEMs) are crucial for fuel cell technology.
Developing high-performance, cost-effective alternatives to Nafion is an ongoing research area.
Sulfonated poly(arylene ether sulfone ketone) (SPESK) copolymers offer tunable properties for PEM applications.

Purpose of the Study:

To synthesize SPESK multiblock copolymers with highly sulfonated hydrophilic blocks.
To investigate the fuel cell performance of these SPESK copolymers as membranes and binders.
To evaluate the potential of SPESK-based membrane electrode assemblies (MEAs) for fuel cell applications.

Main Methods:

Synthesis of SPESK multiblock copolymers with controlled sulfonation.
Fabrication of membrane electrode assemblies (MEAs) using SPESK ionomers.
Fuel cell testing at various temperatures and relative humidity levels.
Comparison of SPESK-based MEAs with Nafion NRE 211 membranes.

Main Results:

SPESK ionomer (1.8 mequiv g(-1)) as a membrane with Nafion binder showed comparable performance to Nafion NRE 211 at 80°C and 30% RH.
A Nafion-free, all-SPESK MEA was operable at 100°C and 50% RH.
Fuel cell performance was limited by proton conductivity, low water flux, and platinum catalyst adsorption.

Conclusions:

SPESK copolymers are viable candidates for fuel cell membranes and binders.
All-SPESK MEAs demonstrate operability at elevated temperatures, suggesting improved performance potential.
Further optimization is needed to address limitations in proton conductivity, water management, and catalyst interaction.