Cathode Catalyst Utilization for the ORR in a PEMFC
- 1 January 2007
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 154 (2), B279-B287
- https://doi.org/10.1149/1.2400626
Abstract
The following model/experiment comparisons aid in predicting the maximum performance of a H2∕oxygenH2∕oxygen proton exchange membrane fuel cell (PEMFC) for a cathode catalyst with known oxygen reduction reaction (ORR) kinetics in the absence of gas transport resistances. Specific focus was on modeling the voltage loss within the cathode catalyst layer, which results from a balance between slow ORR kinetics and resistance to proton transport. A unique plot of proton resistance correction vs the ratio of ohmic (expressed by the proton conduction sheet resistance, RsheetRsheet ) to charge transfer resistance (expressed by the ratio of the Tafel slope of the ORR over the current density, b∕ib∕i ) in a PEMFC cathode (iRsheet∕b)(iRsheet∕b) was developed, based on an analytical solution to effective proton resistance in the porous cathode electrode of a proton exchange membrane fuel cell. Additionally, a plot of catalyst utilization (u)(u) vs iRsheet∕biRsheet∕b was developed to serve as a guideline of experimental design parameters such that catalyst utilization is kept above 90%, which is a prerequisite for measuring the ORR kinetics. The model is applicable as long as the ORR follow simple Tafel kinetics.Keywords
This publication has 14 references indexed in Scilit:
- Determination of Catalyst Unique Parameters for the Oxygen Reduction Reaction in a PEMFCJournal of the Electrochemical Society, 2006
- Measurement of Catalyst Layer Electrolyte Resistance in PEFCs Using Electrochemical Impedance SpectroscopyJournal of the Electrochemical Society, 2005
- Analysis of Polarization Curves to Evaluate Polarization Sources in Hydrogen/Air PEM Fuel CellsJournal of the Electrochemical Society, 2005
- Effect of Relative Humidity on Oxygen Reduction Kinetics in a PEMFCJournal of the Electrochemical Society, 2005
- Dependence of PEM fuel cell performance on catalyst loadingJournal of Power Sources, 2004
- Investigation of Mass-Transport Limitations in the Solid Polymer Fuel Cell CathodeJournal of the Electrochemical Society, 2002
- Design equations for optimized PEM fuel cell electrodesJournal of Applied Electrochemistry, 2000
- Modelling the performance of the cathode catalyst layer of polymer electrolyte fuel cellsJournal of Electroanalytical Chemistry, 1998
- Mass Transport in Gas‐Diffusion Electrodes: A Diagnostic Tool for Fuel‐Cell CathodesJournal of the Electrochemical Society, 1998
- A Mathematical Model of the Solid‐Polymer‐Electrolyte Fuel CellJournal of the Electrochemical Society, 1992