MESSAI.iO

AI summary

70% confidence

This study analyzes the dependence of high-temperature polymer electrolyte membrane fuel cell parameters on current using impedance spectroscopy, finding linear growth in certain parameters with current density. The research modifies a quasi-2D numerical model to fit experimental spectra at low oxygen stoichiometries. The findings provide insight into the physics behind these dependencies.

Generated by MESSAI extraction pipeline · review against source PDF

Generic MFCRepresentative model
Click to animate flow
loading 3D model…

Representative MFC — matched on the paper’s system type only, not its reactor or geometry.

Extraction

Reported parameters

5 extracted values

View extracted values

Open in lab for full controls, parameter editing, and template overlays.

Open in lab →

What they did

System
MFC

What worked

No outcome metrics extracted yet.

Abstract

Abstract A recent quasi–2D numerical model for low–temperature PEMFC impedance is modified and applied for the first time for fitting the experimental spectra of HT–PEMFC measured at low stoichiometries of the oxygen flow in the range of current densities from 20 to 160 mA cm −2 . The double layer capacitance, the proton conductivity and the oxygen diffusivity of the cathode catalyst layer exhibit linear growth with current density, while the ORR Tafel slope and the GDL oxygen diffusivity are independent from the cell current. The physics behind these dependencies is discussed.

Key findings

  • Double layer capacitance increases linearly with current density
  • Proton conductivity exhibits linear growth with current density
  • Oxygen diffusivity of the cathode catalyst layer shows linear dependence on current density

Keywords

Proton exchange membrane fuel cellDielectric spectroscopyTafel equationElectrolyteThermal diffusivityCathode

Identifiers

DOI
10.1002/fuce.201800073
Journal
Fuel Cells
Year
2018