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 Dec 1
Externally publishedYes
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

Fingerprint

Direct methanol fuel cells (DMFC)
Proton exchange membrane fuel cells (PEMFC)
Ionomers
Cathodes
Capacitance
Electrodes
Catalysts
Fuel cells
Equivalent circuits
Catalyst activity
Atmospheric humidity

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Jang, J. H., Jeon, S., Kim, S. K., Lee, S. Y., Cho, E. A., Kim, H. 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

Complex capacitance analysis of ionic resistance and interfacial capacitance within cathode layers of PEMFC and DMFC electrodes. / Jang, Jong H.; Jeon, Sunyeol; Kim, Soo Kil; Lee, Sang Yeop; Cho, Eun Ac; Kim, Hyung Juhn; Han, Jonghee; Lim, Tae Hoon.

ECS Transactions - Proton Exchange Membrane Fuel Cells 9. 1 PART 1. ed. 2009. p. 985-994 (ECS Transactions; Vol. 25, No. 1 PART 1).

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

Jang, JH, Jeon, S, Kim, SK, Lee, SY, Cho, EA, Kim, HJ, Han, J & Lim, TH 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 edn, ECS Transactions, no. 1 PART 1, vol. 25, pp. 985-994, 9th Proton Exchange Membrane Fuel Cell Symposium (PEMFC 9) - 216th Meeting of the Electrochemical Society, Vienna, Austria, 09/10/4. https://doi.org/10.1149/1.3210652
Jang JH, Jeon S, Kim SK, Lee SY, Cho EA, Kim HJ et al. 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. 2009. p. 985-994. (ECS Transactions; 1 PART 1). https://doi.org/10.1149/1.3210652
Jang, Jong H. ; Jeon, Sunyeol ; Kim, Soo Kil ; Lee, Sang Yeop ; Cho, Eun Ac ; Kim, Hyung Juhn ; Han, Jonghee ; Lim, Tae Hoon. / Complex capacitance analysis of ionic resistance and interfacial capacitance within cathode layers of PEMFC and DMFC electrodes. ECS Transactions - Proton Exchange Membrane Fuel Cells 9. 1 PART 1. ed. 2009. pp. 985-994 (ECS Transactions; 1 PART 1).
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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.",
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AU - Lee, Sang Yeop

AU - Cho, Eun Ac

AU - Kim, Hyung Juhn

AU - Han, Jonghee

AU - Lim, Tae Hoon

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N2 - 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.

AB - 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.

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