Abstract
Numerous interlinked processes are responsible for limited durability of polymer electrolyte membrane fuel cells. One of the major phenomena that contribute to accelerated degradation of PEMFCs is loss of hydrophobicity of diffusion media caused by oxidation of carbon in the gas diffusion layer.1 The process is accompanied by formation of oxygen containing surface functional groups. While the vast majority of these groups produce characteristic signals in XPS, DRIFTS, FTIR ATR, etc., frequently an unfavorable signal to noise ratio in such measurements prevents accurate determination of the surface concentration of those functionalities. In this paper, we demonstrate successful application of Boehm type acid base titrations to determine concentrations of acidic functionalities in gas diffusion layer samples that underwent in situ and ex situ oxidation under different conditions and demonstrate correlations between those conditions and carbon oxidation.
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