Anode activation polarization on Pt( h k l) electrodes in dilute sulphuric acid electrolyte

Proton exchange membrane (PEM) fuel cells have been under development for many years and appear to be the potential solution for many electricity supply applications. Modelling and computer simulation of PEM fuel cells have been equally active areas of work as a means of developing better understand...

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Bibliographic Details
Published in:Journal of power sources 2007, Vol.163 (2), p.679-687
Main Authors: Mann, R.F., Amphlett, J.C., Peppley, B.A., Thurgood, C.P.
Format: Article
Language:English
Subjects:
Activation polarization
Applied sciences
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Exact sciences and technology
Exchange current density
Fuel cells
Hydrogen oxidation reaction
Pt electrodes
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Summary:Proton exchange membrane (PEM) fuel cells have been under development for many years and appear to be the potential solution for many electricity supply applications. Modelling and computer simulation of PEM fuel cells have been equally active areas of work as a means of developing better understanding of cell and stack operation, facilitating design improvements and supporting system simulation studies. The prediction of activation polarization in our previous PEM modelling work, as in most PEM models, concentrated on the cathode losses. Anode losses are commonly much smaller and tend to be ignored compared to cathode losses. Further development of the anode activation polarization term is being undertaken in order to broaden the application and usefulness of PEM models in general. Previously published work on the kinetics of the hydrogen oxidation reaction using Pt( h k l) electrodes in dilute H 2SO 4 has been examined and further developed for eventual application to the modelling of PEM fuel cells. New correlations for the exchange current density are developed for Pt(1 0 0), Pt(1 1 0) and Pt(1 1 1) electrodes. Predictive equations for the anode activation polarization are also proposed. In addition, terminology has been modified to make the correlation approach and, eventually, the modelling method more easily understood and used by those without an extensive background in electrochemistry.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2006.10.012