Complex capacitance analysis of ionic resistance and interfacial capacitance within cathode layers of PEMFC and DMFC electrodes

Jong H. Jang, Sunyeol Jeon, Soo Kil Kim, Sang Yeop Lee, Eun Ac Cho, Hyung Juhn Kim, Jonghee Han, Tae Hoon Lim

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

1 Citation (Scopus)

Abstract

For PEMFC and DMFC catalyst layers, a complex capacitance analysis of impedance data was developed to evaluate the catalyst/ionomer interfacial capacitance and ionic resistance of ionomer networks, without non-linear data fitting. Assuming no Faradaic reactions, equivalent circuits for the catalyst layers were suggested, and it was confirmed that the plots of the real and imaginary parts as a function of ac frequency are determined by the catalyst/ionomer interfacial capacitances and RC time constants, which are important characteristics for high fuel cell performances. By performing a complex capacitance analysis, the interfacial capacitances and ionic resistances of PEMFC MEAs can be experimentally obtained at various relative humidities, proving that the catalytic activity in fuel cell operation depends on ionic resistances as well as on the catalyst/ionomer interfacial area. In addition, the effects of various MEA preparation methods on the ionomer distributions and DMFC performances were analyzed by a complex capacitance analysis.

Original languageEnglish
Title of host publicationECS Transactions - Proton Exchange Membrane Fuel Cells 9
Pages985-994
Number of pages10
Edition1 PART 1
DOIs
Publication statusPublished - 2009
Event9th Proton Exchange Membrane Fuel Cell Symposium (PEMFC 9) - 216th Meeting of the Electrochemical Society - Vienna, Austria
Duration: 2009 Oct 42009 Oct 9

Publication series

NameECS Transactions
Number1 PART 1
Volume25
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other9th Proton Exchange Membrane Fuel Cell Symposium (PEMFC 9) - 216th Meeting of the Electrochemical Society
CountryAustria
CityVienna
Period09/10/409/10/9

ASJC Scopus subject areas

  • Engineering(all)

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    Jang, J. H., Jeon, S., Kim, S. K., Lee, S. Y., Cho, E. A., Kim, H. J., Han, J., & Lim, T. H. (2009). Complex capacitance analysis of ionic resistance and interfacial capacitance within cathode layers of PEMFC and DMFC electrodes. In ECS Transactions - Proton Exchange Membrane Fuel Cells 9 (1 PART 1 ed., pp. 985-994). (ECS Transactions; Vol. 25, No. 1 PART 1). https://doi.org/10.1149/1.3210652