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Chemically Crosslinked Sulfonated Polyphenylsulfone (CSPPSU) Membranes for PEM Fuel Cells.

Je-Deok Kim¹, Akihiro Ohira², Hidenobu Nakao³

¹Hydrogen Production Materials Group, Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.

|February 23, 2020

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This summary is machine-generated.

A novel crosslinked sulfonated polyphenylsulfone (CSPPSU) membrane demonstrates excellent stability and performance for fuel cells. This polymer electrolyte membrane shows promise for long-term applications, outperforming current standards.

Area of Science:

Materials Science
Electrochemistry
Polymer Chemistry

Background:

Developing high-performance polymer electrolyte membranes (PEMs) is crucial for advancing fuel cell technology.
Existing membranes like Nafion face challenges in long-term durability and cost-effectiveness.
Sulfonated polymers offer potential alternatives due to tunable properties.

Purpose of the Study:

To synthesize a high-performance, large-area crosslinked sulfonated polyphenylsulfone (CSPPSU) membrane.
To develop an effective activation process for the CSPPSU membrane.
To evaluate the fuel cell performance and long-term stability of the developed CSPPSU membrane.

Main Methods:

Synthesis of sulfonated polyphenylsulfone (SPPSU) from polyphenylsulfone (PPSU).

Keywords:

High IEC, CSPPSU PEMFCs PPSU activation

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Preparation of large-area CSPPSU membranes and development of an alkaline/acidic activation process to remove SO2 byproduct.

Fuel cell testing (I-V curves, H2 crossover) and long-term stability evaluation under constant current.

Main Results:

The CSPPSU membrane exhibited high thermal, mechanical, and chemical stabilities after activation.
Fuel cell performance comparable to Nafion was achieved in I-V studies.
Significantly improved durability compared to Nafion212 was observed in H2 gas crossover tests.
A record stability of 4000 hours was achieved in long-term constant current tests.

Conclusions:

The developed activation method is effective in producing stable CSPPSU membranes.
CSPPSU membranes show excellent performance and durability, making them a promising alternative to conventional PEMs.
This research highlights the potential of CSPPSU as a next-generation polymer electrolyte membrane for fuel cells.