Performance Recovery after Contamination with Nitrogen Dioxide in a PEM Fuel Cell

Abstract

While the market for fuel cell vehicles is increasing, these vehicles will still coexist with combustion engine vehicles on the roads and will be exposed to an environment with significant amounts of contaminants that will decrease the durability of the fuel cell. To investigate different recovery methods, in this study, a PEM fuel cell was contaminated with 100 ppm of NO2 at the cathode side. The possibility to recover the cell performance was studied by using different airflow rates, different current densities, and by subjecting the cell to successive polarization curves. The results show that the successive polarization curves are the best choice for recovery; it took 35 min to reach full recovery of cell performance, compared to 4.5 h of recovery with pure air at 0.5 A cm⁻² and 110 mL min⁻¹. However, the performance recovery at a current density of 0.2 A cm⁻² and air flow 275 mL min⁻¹ was done in 66 min, which is also a possible alternative. Additionally, two operation techniques were suggested and compared during 7 h of operation: air recovery and air depletion. The air recovery technique was shown to be a better choice than the air depletion technique.

Key findings

• ▸Successive polarization curves are the best choice for recovery, taking 35 minutes to reach full recovery.
• ▸Air recovery technique is a better choice than air depletion technique.
• ▸Recovery with pure air at 0.5 A cm⁻² and 110 mL min⁻¹ took 4.5 hours.

Keywords

Identifiers

DOI

10.3390/molecules25051115

Journal

Molecules

Year

2020