Abstract
AbstractProton exchange membrane fuel cell (PEMFC) is one of the most promising technologies in energy conversion. Nevertheless, improper operating conditions can severely affect the fuel cell (FC) lifespan. It is a matter of fact, that several degradation mechanisms could take place inside the cell in case of abnormal operating conditions. Among these, improper water managements, fuel quality and starvation conditions can show critical effects on PEMFC performance. Furthermore, if the exposure time to these faulty conditions resulted quite long, irreversible degradations and system ageing would occur. This work aims to investigate the impact of both improper water managements and reactants starvation conditions on H2/O2 PEMFC short‐stacks performance. To this purpose, the experimental activity performed to characterize the stack health‐state both in normal and abnormal conditions is presented. Particular attention is dedicated to the effects caused by improper conditions on stack electrochemical impedance spectroscopy (EIS) measurements' variations. Depending on the faulty conditions, the experimental results are then analyzed for health‐state monitoring and diagnosis purposes.
Highlights
Nowadays, the increase of the greenhouse gases mainly due to the increasing CO2 concentration in the atmosphere leads people to pay particular attention to energy saving and converting technologies
It is a matter of fact that Proton exchange membrane fuel cell (PEMFC) performance and lifespan are directly related to the operating conditions
As both the shape and magnitude of the electrochemical impedance spectroscopy (EIS) spectra change with respect to the fuel cell (FC) operations, both nominal and faulty conditions are considered in this paper
Summary
The increase of the greenhouse gases mainly due to the increasing CO2 concentration in the atmosphere leads people to pay particular attention to energy saving and converting technologies. That the polarization resistance is composed by the sum of the electrolyte resistance and the real value of the Faraday impedance at low frequencies; the last one taking into account both the charge transfer and diffusion processes [6] As both the shape and magnitude of the EIS spectra change with respect to the FC operations, both nominal and faulty conditions are considered in this paper. Particular attention will be payed to induce faults consistently with the system real operating conditions; physical constraints and measurements stability conditions are evaluated The impact of both the faulty conditions and their related degradation mechanisms onto the EIS spectra is deepened within section 4. Considerations and conclusion are drawn at the end of the manuscript
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
