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), 1607-1612. (doi:10.1016/j.elecom.2007.03.002).

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Description/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.

Item Type: Article
ISSNs: 1388-2481 (print)
Keywords: hydrogen underpotential deposition, cyclic voltammetry, fuel cell, catalysis, hydrogen oxidation reaction, eca
Subjects: B Philosophy. Psychology. Religion > BQ Buddhism
Q Science > QD Chemistry
T Technology > TK Electrical engineering. Electronics Nuclear engineering
T Technology > TP Chemical technology
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 189819
Date Deposited: 07 Jun 2011 10:22
Last Modified: 27 Mar 2014 19:42
URI: http://eprints.soton.ac.uk/id/eprint/189819

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