Experimental Analysis on the Influence of Operating Profiles on High Temperature Polymer Electrolyte Membrane Fuel Cells

Tancredi Chinese, Federico Ustolin, Benedetta Marmiroli, Heinz Amenitsch and Rodolfo Taccani
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Tancredi Chinese: Cenergy srl, c/o AREA Science Park, Basovizza, 34149 Trieste, Italy
Federico Ustolin: Dipartimento di Ingegneria e Architettura, Università degli studi di Trieste, via Valerio 10, 34127 Trieste, Italy
Benedetta Marmiroli: Institute of Inorganic Chemistry, Graz University of Technology, Stremayrgasse 9/IV, 8042 Graz, Austria
Heinz Amenitsch: Institute of Inorganic Chemistry, Graz University of Technology, Stremayrgasse 9/IV, 8042 Graz, Austria
Rodolfo Taccani: Dipartimento di Ingegneria e Architettura, Università degli studi di Trieste, via Valerio 10, 34127 Trieste, Italy

Energies, 2021, vol. 14, issue 20, 1-14

Abstract: The Energy System lab at the University of Trieste has carried out a study to investigate the reduction in performance of high temperature polymer electrolyte membrane (HTPEM) fuel cell membrane electrode assemblies (MEAs) when subjected to different ageing tests. In this study, start and stop cycles, load cycles, open circuit voltage (OCV) permanence and constant load profile were considered. Polarization curves (PC) together with electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) data were recorded during the ageing tests to assess the fuel cell performance. In this paper, experimental data are presented to confirm the test methodology previously proposed by the authors and to quantitatively correlate the performance degradation to the operational profiles. It was demonstrated that OCV condition, start and stop and load cycling increase degradation of the MEAs with respect to constant load operation. As expected, the OCV is the operational condition that influences performance degradation the most. Finally, the MEAs were analyzed with synchrotron small angle X-ray scattering (SAXS) technique at the Austrian SAXS beamline at Elettra-Sincrotrone Trieste to analyze the nano-morphological catalyst evolution. As for the catalyst morphology evolution, the ex situ SAXS methodology proposed by the authors is confirmed in its ability to assess the catalyst nanoparticles aggregation.

Keywords: hydrogen; fuel cell; high temperature polymer electrolyte membrane; membrane electrode assembly; operating profiles; performance degradation; electrochemical surface area; polarization curve; SAXS analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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