Document Type

Article

Publication Date

2003

Publication Title

Electrochemical and Solid State Letters

Abstract

Anode gas outlet CO concentration is measured by an online infrared gas analyzer for a proton exchange membrane (PEM) fuel cell fed with FormulaCO and with Pt or PtRu as anode catalyst. CO concentration increased with anode inlet flow rate at a given current density for Pt catalyst. CO outlet concentration with PtRu catalyst depended upon the current density at a cell temperature of 80°C. The CO concentration decreased with the increase of anode inlet flow rate at low current densities, while at higher current densities the outlet CO concentration followed a trend similar to that observed with Pt. The CO electro-oxidation rate on Pt and PtRu is thus calculated using CO material balance on the anode side. Results indicate that the enhanced tolerance of PtRu catalyst is due to the dual mechanisms of reduced CO affinity (ligand effect) and enhanced CO electro-oxidation rates (bifunctional effect), with either mechanism dominating depending on anode overpotential.

Volume

6

Issue

1

First Page Number

A5

Last Page Number

A8

DOI

10.1149/1.1523690

Publisher Statement

© The Electrochemical Society, Inc., 2003. 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). The archival version of this work was published in Electrochemical and Solid State Letters 6 (1), A5-A8.

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