Oxygen Reduction Kinetics in Nafion-Impregnated Gas Diffusion Electrode under Mixed Control Using EIS and PCT

Cited 7 time in webofscience Cited 0 time in scopus
  • Hit : 366
  • Download : 0
The oxygen reduction kinetics in a Nafion-impregnated gas diffusion electrode was investigated as a function of the Nafion content under the mixed migration and charge transfer control, using electrochemical impedance spectroscopy (EIS) and a potentiostatic current transient (PCT) technique. For this purpose, the gas diffusion electrodes were prepared with different Nafion contents in order to control the Nafion length distribution across the active catalyst layer (ACL). From the comparison of the nitrogen gas adsorption isotherms of Nafion-impregnated Pt/C powder specimens with the isotherm of pure Pt/C powder specimen, it was found that as the Nafion content within the ACL increased, the average Nafion length increased, and the Nafion length distribution became narrower. From the analysis of the impedance spectra considering the Nafion length distribution, it was confirmed that as the Nafion content increased, the charge transfer resistance R(ct) was reduced slowly, but the component diffusivity of proton D(H)(+) was enhanced rapidly. From the analysis of the cathodic PCTs in consideration of the Nafion length distribution, it was concluded that when the Nafion content increased, oxygen reduction was dominantly controlled by charge transfer rather than by proton migration under the mixed migration and charge transfer-controlled constraint. (C) 2008 The Electrochemical Society. [DOI: 10.1149/1.2987944] All rights reserved.
Publisher
Electrochemical Soc Inc
Issue Date
2008
Language
English
Article Type
Article
Keywords

PEM FUEL-CELL; INTEGRATED NITROGEN SORPTION; PORE-LENGTH DISTRIBUTION; CATALYST LAYER; ELECTROCHEMICAL IMPEDANCE; MERCURY POROSIMETRY; MASS-TRANSPORT; PART I; PLATINUM; MODEL

Citation

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, v.155, no.12, pp.B1274 - B1280

ISSN
0013-4651
DOI
10.1149/1.2987944
URI
http://hdl.handle.net/10203/86731
Appears in Collection
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 7 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0