Raman Spectroscopy of an Aged Low Temperature Polymer Electrolyte Fuel Cell Membrane
Artikel i vetenskaplig tidskrift, 2011

The cost and durability of the membrane electrode assembly (MEA) are today limiting factors for large-scale commercialisation of the polymer electrolyte membrane fuel cell (PEMFC). The MEA durability in a real working fuel cell (FC) is closely linked to specific operating conditions such as temperature, gas humidity, load dynamics, etc. This often results in both chemical and mechanical degradation of the ion-conducting membrane and subsequent operation failure of the FC. In this study, Raman spectroscopy is used to identify and distinguish between two different degradation processes for a 1,500 h in situ aged FC membrane. The primary process is due to the loss of proton conducting sulphonic acid end groups over the entire membrane. The secondary process is a degradation of the fluorinated backbone concentrated to the cathode interface; making possible the collapse of carbon into the resulting voids of the membrane. Using spatially resolved Raman spectroscopy we can unambiguously observe both the localisation and the state of the carbon inside the membrane; being similar/identical to the microporous layer (MPL).

impacts

Raman

MEA

Spectroscopy

proton-exchange membrane

Membrane

durability

degradation mitigation

nafion(r) membranes

management

assemblies

platinum

Degradation

Polymer Electrolyte Fuel Cell

operation

hydrogen-peroxide

Författare

Mikael Holber

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Patrik Johansson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Per Jacobsson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Fuel Cells

1615-6846 (ISSN) 1615-6854 (eISSN)

Vol. 11 3 459-464

Styrkeområden

Energi

Materialvetenskap

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1002/fuce.201100006