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Modelling of Carbon Corrosion in a PEMFC caused by Local Fuel Starvation

The issue of degradation of membrane electrode assembly (MEA) materials is a major obstacle to commercialization of proton exchange membrane fuel cells (PEMFCs). Some possible degradation mechanisms identified in the literature include (1) membrane degradation (2) Pt dissolution and migration (3) MEA poisoning, and (4) corrosion of carbon support due to fuel starvation. In the present study we focus on the modelling of carbon corrosion due to local fuel starvation, which may occur due to channel blockage or mal-distribution of gas reactants in a unit cell. The issue of carbon corrosion is critical to the durability of PEMFCs [1]. Modelling work on this topic reported thus far is limited to zerodimension (0-D) or one-dimension (1-D) and the electrochemistry in these models are not coupled with other transport processes [2] [3], therefore the capability of the models to predict carbon corrosion rate is limited.