Estimation of water layer thickness adjacent to the cathode catalyst layer of a PEFC (analysis using electrochemical impedance spectroscopy)

T. Hoshiko, Hironori Nakajima, T. Konomi, Tatsumi Kitahara, S. Kita

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

3 Citations (Scopus)

Abstract

We have analyzed the impedance of the cathode of a polymer electrolyte fuel cell (PEFC) to estimate oxygen diffusion distance, δ. Assuming planar oxygen diffusion in a thin liquid water layer at the cathode unconventionally, we can regard δ as water layer thickness adjacent to the cathode catalyst layer. Calculated values of δ agree well with our previous experimental result of liquid water accumulation amount at the cathode. Measurement of impedance variation with time reveals that δ initially tends to be almost constant with time after start-up from dry condition, but that excessive water accumulation due to long time operation causes an increase in δ. From the viewpoint of the diagnosis, an exceeding increase in δ can be used to indicate the flooding at the catalyst layer.

Original languageEnglish
Title of host publicationECS Transactions - Proton Exchange Membrane Fuel Cells 8
Pages2117-2123
Number of pages7
Edition2 PART 2
DOIs
Publication statusPublished - Dec 1 2008
EventProton Exchange Membrane Fuel Cells 8, PEMFC - 214th ECS Meeting - Honolulu, HI, United States
Duration: Oct 12 2008Oct 17 2008

Publication series

NameECS Transactions
Number2 PART 2
Volume16
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

OtherProton Exchange Membrane Fuel Cells 8, PEMFC - 214th ECS Meeting
CountryUnited States
CityHonolulu, HI
Period10/12/0810/17/08

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Hoshiko, T., Nakajima, H., Konomi, T., Kitahara, T., & Kita, S. (2008). Estimation of water layer thickness adjacent to the cathode catalyst layer of a PEFC (analysis using electrochemical impedance spectroscopy). In ECS Transactions - Proton Exchange Membrane Fuel Cells 8 (2 PART 2 ed., pp. 2117-2123). (ECS Transactions; Vol. 16, No. 2 PART 2). https://doi.org/10.1149/1.2982051