![]() ![]() However, only few studies exist which analyze the degradation of automotive full size stacks (>350 cells, active area approx. Several studies performed degradation analysis on lab-scale size single cells 4- 7, on lab-scale short- and mid-size-stacks 8- 12 as well as on automotive size single cells 13 and on automotive size short- and midsize-stacks 14- 16. Therefore, knowledge about full size stack degradation under realistic conditions is crucial. For the commercialization of fuel cell electric vehicles a sufficient durability (>5,000 h) of the fuel cell stack is required 3. Catalyst coated membranes are composed of a proton conducting membrane covered with two catalyst layers. ![]() The GDL typically consists of a substrate like carbon paper and a microporous layer (MPL). The latter has two gas diffusion layers (GDLs) and a catalyst coated membrane (CCM). A state-of-the-art PEMFC itself consists of various components including bipolar plates and a membrane electrode assembly (MEA). ![]() ![]() Fuel cell electric vehicles (FCEVs) generate power with the help of a fuel cell stack typically assembled from several hundreds of single polymer electrolyte membrane fuel cells (PEMFCs). Fuel cell electric vehicles allow both a high driving range and quick refueling time, while having zero emission and are thus considered a promising candidate for green mobility 2. Increasing traffic numbers 1 make the implementation of these goals even more challenging. This improved stack analysis approach allowed us to detect local differences in degradation on both cell and stack level.Įlectromobility is a key technology for reducing both greenhouse gas emission and urban air pollution in the mobility sector. Finally, a fast indication for stack degradation is suggested by correlating different degradation phenomena. For the latter, a degradation mechanism based on liquid water formation, local fuel starvation and current density distribution at the interface between microporous layer and cathode catalyst layer is postulated. In addition, we report linear and circular Pt depositions on top of the cathode catalyst layer, which have to the best of our knowledge not been described in literature yet. Herein, we focus on defects at the cathode catalyst layer and their interrelation including inhomogeneous adhesion of the microporous layer on the catalyst layer, crack formation, cathode catalyst layer thinning and wrinkling of the catalyst coated membrane. In the present work, degradation analysis of an automotive full size stack is performed. In order to meet the requirements, knowledge about the most severe degradation mechanisms of fuel cell stacks under automotive conditions is crucial. The achievement of durability targets is an important challenge for the commercialization of fuel cell electric vehicles (FCEV). ![]()
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