Oxygen Reduction on Gas-Diffusion Electrodes for Phosphoric Acid Fuel Cells by a Potential Decay Method

Qingfeng Li, Xiao Gang, Hans Aage Hjuler, Rolf W. Berg, Niels Bjerrum

Research output: Contribution to journalJournal articleResearchpeer-review

659 Downloads (Pure)

Abstract

The reduction of gaseous oxygen on carbon supported platinum electrodes has been studied at 150 degrees C with polarization and potential decay measurements. The electrolyte was either 100 weight percent phosphoric acid or that acid with a fluorinated additive, potassium perfluorohexanesulfonate (C6F13SO3K). The pseudo-Tafel curves of the overpotential vs. log (ii(L)/(i(L) - i)) show a two-slope behavior, probably due to different adsorption mechanisms. The potential relaxations as functions of log (t + tau) and log (-d eta/dt) have been plotted. The variations of these slopes and the dependence of the double-layer capacitance on the overpotential depended on the electrode manufacture and the kind of electrolyte (whether containing the fluorinated additive or not).
Original languageEnglish
JournalJournal of The Electrochemical Society
Volume142
Issue number10
Pages (from-to)3250-3256
ISSN0013-4651
DOIs
Publication statusPublished - 1995

Bibliographical note

Copyright The Electrochemical Society, Inc. [1995]. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS).

Fingerprint

Dive into the research topics of 'Oxygen Reduction on Gas-Diffusion Electrodes for Phosphoric Acid Fuel Cells by a Potential Decay Method'. Together they form a unique fingerprint.

Cite this