Papageorgopoulos

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October 2001
ECN-RX--01-065
THE INFLUENCE OF CARBON DIOXIDE ON PEM FUEL CELL ANODES
F.A. de Bruijn D.C. Papageorgopoulos E.F. Sitters G.J.M. Janssen
Revisions A B Made by: Approved: ECN Clean Fossil Fuels Hydrogen Technologies & Applied Catalysis F.A. de Bruijn Checked by: A. Wakker Issued:
G.J.M. Janssen
C.A.M. van der Klein
Acknowledgements
The dutch agency NOVEM is greatfully acknowledged for subsidising the fuel cell experiments.
Abstract
The influence of CO2 on the performance of PEM fuel cells was investigated by means of fuel cell experiments and cyclic voltammetry. Depending on the composition and microstructure of the fuel cell anode, the effect varies from small to significant. Adsorbed hydrogen plays a dominant role in the formation of CO-like species via the reverse water gas shift reaction. Platinum sites which are not utilised in the electrochemical oxidation of hydrogen are thought to catalyse this reverse shift reaction. Alloying with ruthenium suppresses the reverse shift reaction.
Keywords
PEM fuel cell (PEMFC), reformate, CO2-tolerance, reverse water gas shift.
2
ECN-RX--01-065
CONTENTS
1. 2. INTRODUCTION EXPERIMENTAL 2.1 Fuel cell MEA preparation 2.2 Fuel Cell experiments 2.3 Cyclic Voltammetry experiments RESULTS 3.1 Thermodynamics 3.2 Fuel Cell Experiments 3.3 Cyclic Voltammetry DISCUSSION CONCLUSIONS 5 6 6 6 6 9 9 10 12 17 21 23
3.
4. 5.
REFERENCES
ECN-RX--01-065
3
4
ECN-RX--01-065
1.
INTRODUCTION

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