Book/Dissertation / PhD Thesis

FZJ-2022-01506

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Stationary and Transient Behaviour of Polymer Electrolyte Fuel Cells

Shi, Y. (Corresponding author)FZJ*

2022
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-95806-611-3

Please use a persistent id in citations: http://hdl.handle.net/2128/30868  urn:nbn:de:0001-2022040531

Abstract: The Low Temperature Polymer Electrolyte Fuel Cell (LT-PEFC) is a promising alternative power source for automotive applications that offers a relatively simple system level, high efficiency, and completely harmless emissions. Fuel cell operations are complex processes that can be influenced by numerous different operating conditions. This thesis, therefore, focuses on the analysis of the impact of different operating conditions on, both static and dynamic behavior of the LT-PEFC. An accuracy study is first performed to evaluate the repeatability and reproducibility of the in-house assembled LT-PEFCs employed in the experiments. Four test cells are assembled and tested under the same operating conditions. It is found that the repeatability and reproducibility of the test cells are better when higher stoichiometry ratios and lower current density are applied in the tests. Overall, the LT-PEFCs used in the experiments are characterized by a high level of accuracy. Various operating parameters are considered in the cell static behavior analysis. With the help of split-plot design, cell orientation, cell temperature, cathodic stoichiometric ratio and backpressure are determined to be the most statistically significant factors for the cell static behavior. Furthermore, the optimal cell performance and corresponding parameter settings are determined via the response surface methodology (RSM). Voltage overshoot and undershoot behavior are used to characterize the cell dynamic behavior. Using split-plot design, the load change step, cell temperature, cathodic stoichiometric ratio and backpressure are selected as the most significant factors for both the voltage undershoot and overshoot behaviors. Additionally, the effect of load change ramp on voltage undershoot and overshoot is determined. The result suggests that the load change with the ramp can significantly reduce the undershoot and overshoot magnitudes. Moreover, the load change with the ramp has a limited impacton the average pressure drop and the ohmic resistance of the test cell.

Note: RWTH Aachen, Diss., 2021

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Contributing Institute(s):

1. Elektrochemische Verfahrenstechnik (IEK-14)

Research Program(s):

1. 1231 - Electrochemistry for Hydrogen (POF4-123) (POF4-123)

Appears in the scientific report 2022

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