Initial conditioning of polymer eelectrolyte membrane fuel cell by temperature and potential cycling.

Dario Bezmalinović,Frano Barbir,Jagoda Radošević

doi:10.17344/acsi.2014.730

Abstract

Polymer electrolyte membrane fuel cells need initial conditioning, activation or break-in the first time they are operated after being assembled. During this period performance of the fuel cell improves until it reaches its nominal performance. The exact mechanism of this initial conditioning is not completely understood, but it is assumed that during the conditioning process the polymer membrane, as well as the polymer in the catalyst layer, get humidified, and the number of active catalyst sites increases. Activation procedure proposed here consists of temperature and potential cycling. Temperature cycling is a new approach for the conditioning and the idea is to rapidly cool the running cell at some point to allow the membrane to equilibrate with condensed water which should result in higher intake of water within the membrane. The results show that proposed procedure is better or at least comparable to some conventional procedures for the initial conditioning.

Highlights

It is well known that the Polymer Electrolyte Membrane (PEM) fuel cells need initial conditioning, activation or break-in the first time they are operated after being assembled.[1]
Temperature cycling is a new approach for the conditioning, and the idea is to rapidly cool a running cell at some point to allow the membrane to equilibrate with condensed water, which should result in higher intake of water within the membrane
The results show that proposed procedure is better or at least comparable to some conventional procedures for the initial conditioning

Summary

Introduction

It is well known that the Polymer Electrolyte Membrane (PEM) fuel cells need initial conditioning, activation or break-in the first time they are operated after being assembled.[1] During this period the performance of the fuel cell gradually increases until it reaches its final value. Depending on the membrane electrode assembly (MEA) and the break-in procedure, this process can take hours or even days to complete. Choosing the right break-in procedure can save a lot of time as well as hydrogen. It is accepted that high temperatures and high humidities coupled with high currents and/or load cycling are beneficial for the successful initial conditioning.[2]

Objectives

Results

Conclusion