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NAMS 2002 Workshop - ICOM 2008

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Fuel Cells II – 7<br />

Thursday July 17, 12:00 PM-12:30 PM, Wai’anae<br />

Automotive Hydrogen Fuel Cell Membrane Applications<br />

A. Brenner (Speaker), General Motors, Honeoye Falls, New York, USA -<br />

annette.brenner@gm.com<br />

F. Coms, General Motors, Honeoye Falls, New York, USA<br />

C. Gittleman, General Motors, Honeoye Falls, New York, USA<br />

R. Jiang, General Motors, Honeoye Falls, New York, USA<br />

Y. Lai, General Motors, Honeoye Falls, New York, USA<br />

A. Nayar, General Motors, Honeoye Falls, New York, USA<br />

M. Schoeneweiss, General Motors, Honeoye Falls, New York, USA<br />

Y. Zhang, General Motors, Honeoye Falls, New York, USA<br />

Automotive fuel cell systems have requirements that differ from other fuel cell<br />

applications. The challenge is dynamic operation over the wide range of<br />

operating conditions experienced by the vehicle during its 5500 hour target life.<br />

How the vehicle requirements translate to membrane targets and related testing<br />

is reviewed for two membrane focus areas within the automotive system: the<br />

PEM fuel cell stack and humidification subsystem. The in-situ and ex- situ<br />

measurements used to evaluate these membranes for use in commercial<br />

automotive fuel cells will be described in addition to corresponding targets and<br />

status.<br />

Recovery of water from the cathode exhaust with a humidification membrane can<br />

extend the durability and enhance performance of the PEM. Water transport and<br />

gas separation are the key performance metrics of the humidification<br />

membranes. The primary functions of the PEM membrane are proton transport,<br />

gas separation and electrical insulation. The PEM can fail due to chemical<br />

degradation, mechanical degradation or a combination. The humidification<br />

membrane is subject to some similar factors contributing to mechanical<br />

degradation, such as high temperatures and drier conditions. Cycling of humidity<br />

and freeze and oxidative environments can also contribute to degradation.<br />

Durability, performance, and processability of each membrane are critical to<br />

meeting the cost, life, and performance targets of the fuel cell vehicle.

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