Evaluation of the degradation of fuel cell hybrids

Mark C. Williams, Wolfgang Winkler, Ai Suzuki, Akira Miyamoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Fuel cell hybrids are combination of energy conversion sub-systems - fuel cells and heat engines. This paper is a study of fuel cell hybrids electrochemical performance when the fuel cell sub-system is undergoing degradation. In all cases one can utilize the waste heat to improve overall efficiency through hybridization. Even degradation rates of 0.25 percent per 1000 hours corresponding to 40,000 hour life produce significant amounts of waste heat. Power loss is especially high at EOL. Hybridization utilizes waste heat and can be used if degradation occurs and if long fuel cell life is expected. The common practice is to linearize degradation. Giving a linear representation to DR, however, gives a linear structure to the area specific resistance, ASR(t). Experimental evidence shows that ASR(t) is commonly an ohmic parabolic function. Degradation rate, DRavg(t), %/1000 hours varies throughout the life of the fuel cell for ohmic parabolic degradation behavior . This paper builds from and is an extension of several papers recently published in the Journal of The Electrochemical Society (ECS), ECS Transactions, and the Journal of Fuel Cell Science and Technology.

Original languageEnglish
Title of host publicationFuel Cell Seminar 2011
PublisherElectrochemical Society Inc.
Number of pages12
ISBN (Electronic)9781566779807
ISBN (Print)9781566779807
Publication statusPublished - 2012
Event2011 Fuel Cell Seminar and Exposition - Orlando, FL, United States
Duration: 2011 Oct 312011 Nov 3

Publication series

NameECS Transactions
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737


Other2011 Fuel Cell Seminar and Exposition
Country/TerritoryUnited States
CityOrlando, FL

ASJC Scopus subject areas

  • Engineering(all)


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