@inproceedings{5c58600faabb4b039f2d0eb781764797,
title = "Estimation of water layer thickness adjacent to the cathode catalyst layer of a PEFC (analysis using electrochemical impedance spectroscopy)",
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.",
author = "T. Hoshiko and H. Nakajima and T. Konomi and T. Kitahara and S. Kita",
year = "2009",
doi = "10.1149/1.2982051",
language = "English",
isbn = "9781566776486",
series = "ECS Transactions",
publisher = "Electrochemical Society Inc.",
number = "2 PART 2",
pages = "2117--2123",
booktitle = "ECS Transactions - Proton Exchange Membrane Fuel Cells 8",
edition = "2 PART 2",
note = "Proton Exchange Membrane Fuel Cells 8, PEMFC - 214th ECS Meeting ; Conference date: 12-10-2008 Through 17-10-2008",
}