D1.3: Degradation Mechanisms in Automotive Fuel Cell Systems

Željko Penga, Gojmir Radica, Frano Barbir, Peter Eckert
2017 Zenodo  
Degradation mechanisms in automotive PEM fuel cell systems are categorized, in this deliverable, in regard to the degradation mechanisms of each component of PEM fuel cell stack, namely: membrane, catalyst layers, gas diffusion layers, bipolar plates and sealing gaskets. The underlying degradation mechanisms of each of the aforementioned structural component of the cell are decomposed with brief explanation of the physical phenomena causing the degradation and the inter-relation of the
more » ... of one constituent of the structural component on the other. The analysis based on available data from the project partners and literature survey leads to the conclusion that the main degradation mechanisms of the cell depend on high number of different variables, such as MEA manufacturing process, assembly, operating conditions, thermal cycling, relative humidity cycling, subfreezing ambient temperature, load cycling, etc. Therefore, the main degradation mechanisms have to be determined based on the particular and highly detailed cell configuration. The mitigation strategies are proposed for each structural component, although some of the requirements may be in confrontation with each other. PEM fuel cell degradation cannot be completely suppressed, however by closely monitoring the cell operation and adapting the operating conditions to the particular cell design, they can be significantly minimized. The accelerated stress tests are surveyed and listed for each structural component, and some of them are compared vs. real-time investigation under certain operating conditions (e.g. carbon corrosion) with good agreement. General conclusion is that the ability of Degradation Mechanisms in Automotive Fuel Cell Systems Page 2 of 46 the accelerated stress tests to predict the real-time operating conditions inside the cell is of a limited reliability, due to the nature of simulating only a limited number of degradation mechanisms at the same time, with quite limited influence on other structural components of the cell, unlike t [...]
doi:10.5281/zenodo.3886616 fatcat:mqqzwswrr5aare7jcufxehdtwi