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Effect of inert gas flow on hydrogen underpotential deposition measurements in polymer electrolyte fuel cells

Schneider, I.A., Kramer, D., Wokaun, A. and Scherer, G.G. (2007) Effect of inert gas flow on hydrogen underpotential deposition measurements in polymer electrolyte fuel cells Electrochemistry Communications, 9, (7), pp. 1607-1612. (doi:10.1016/j.elecom.2007.03.002).

Record type: Article

Abstract

The effect of inert gas flow rate on hydrogen underpotential deposition (H-upd) measurements in polymer electrolyte fuel cells (PEFCs) was investigated using a novel experimental technique. The method combines local voltammetric measurements in PEFCs with the use of sectioned electrodes. The results give experimental proof that the high inert gas flow rate usually employed in voltammetric measurements in PEFCs at the working electrode results in high hydrogen reduction currents in both the cathodic and the anodic sweep, which hampers an accurate determination of the electrochemically active surface area (ECA). Strong spatial inhomogeneities occur at low potentials as a consequence of formation and accumulation of molecular hydrogen along the flow field. The results show that the flow of inert gas should be minimized or even stopped during a measurement to allow molecular hydrogen to accumulate at the working electrode and to provide uniform conditions along the flow field.

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More information

Published date: 7 July 2007
Keywords: hydrogen underpotential deposition, cyclic voltammetry, fuel cell, catalysis, hydrogen oxidation reaction, eca
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 189819
URI: http://eprints.soton.ac.uk/id/eprint/189819
ISSN: 1388-2481
PURE UUID: 830638bd-a17b-44c0-a3ac-4f9c89b91df2

Catalogue record

Date deposited: 07 Jun 2011 10:22
Last modified: 18 Jul 2017 11:39

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Contributors

Author: I.A. Schneider
Author: D. Kramer
Author: A. Wokaun
Author: G.G. Scherer

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