Experimental analysis of a degraded open-cathode PEM fuel cell stack
10.1016/j.ijhydene.2013.12.115
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/23542
Tipus de documentArticle
Data publicació2014
Condicions d'accésAccés obert
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Abstract
The well-known challenges to overcome in PEM fuel cell research are their relatively low durability and the high costs for the platinum catalysts. This work focuses on degradation mechanisms that are present in open-cathode PEM fuel cell systems and their links to the decaying fuel cell performance. Therefore a degraded, open-cathode, 20 cell, PEM fuel cell stack was analyzed by means of in-situ and ex-situ techniques. Voltage transients during external perturbations, such as changing temperature, humidity and stoichiometry show that degradation affects individual cells quite differently towards the end of life of the stack. Cells located close to the endplates of the stack show the biggest performance decay. Electrochemical impedance spectroscopy (EIS) data present non-reversible catalyst layer degradation but negligible membrane degradation of several cells. Post-mortem, ex-situ experiments, such as cyclic voltammetry (CV), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) show a significant active area loss of the first cells within the stack due to Pt dissolution, oxidation and agglomeration. Scanning electron microscope (SEM) images of the degraded cells in comparison with the normally working cells in the stack show severe carbon corrosion of the cathode catalyst layers.
CitacióStrahl, S. [et al.]. Experimental analysis of a degraded open-cathode PEM fuel cell stack. "International journal of hydrogen energy", 2014, vol. 39, núm. 10, p. 5378-5387.
ISSN0360-3199
Versió de l'editorhttp://dx.doi.org/10.1016/j.ijhydene.2013.12.115
Col·leccions
- ACES - Control Avançat de Sistemes d'Energia - Articles de revista [194]
- Departament d'Enginyeria de Sistemes, Automàtica i Informàtica Industrial - Articles de revista [1.394]
- GREENER - Grup de recerca d'estudis energètics i de les radiacions - Articles de revista [178]
- INTE - Institut de Tècniques Energètiques - Articles de revista [285]
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