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Local Impact of Humidification on Degradation in Polymer Electrolyte Fuel Cells

Garcia Sanchez, Daniel and Ruiu, Tiziana and Biswas, Indro and Schulze, Matthias and Helmly, Stefan and Friedrich, Kaspar Andreas (2016) Local Impact of Humidification on Degradation in Polymer Electrolyte Fuel Cells. Journal of Power Sources. Elsevier. ISSN 0378-7753

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Water management represents one of the main challenges in the design and operation of Polymer Electrolyte Fuel Cells (PEFCs). Besides performance, the water level also affects the durability of the cell. Understanding the degradation processes is of vital importance for extending durability of PEFCs by suitable mitigation strategies. In this work, the degradation processes related to operation with fully- and non-humidified gas streams were locally studied. The differences were analyzed using in-situ diagnostic tools, such as segmented cell for local current density measurements, during a 300 h test operating under constant conditions, in combination with local post-test analysis, i.e. SEM/EDX and XPS. The results showed the deep impact of the RH on homogeneity during the degradation process due to the fact that different water distribution influences the chemical environment. Under non-humidified gas streams, the cathode inlet region exhibited increased degradation, whereas with fully humidified gases the bottom of the cell had the higher performance losses. The degradation and the degree of reversibility produced by Pt dissolution, PTFE defluorination, and contaminants such as silicon (Si) and nickel (Ni) were locally evaluated

Item URL in elib:https://elib.dlr.de/109862/
Document Type:Article
Title:Local Impact of Humidification on Degradation in Polymer Electrolyte Fuel Cells
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Garcia Sanchez, Danieldaniel.garciasanchez (at) dlr.deUNSPECIFIED
Ruiu, Tizianatiziana.ruiu (at) dlr.deUNSPECIFIED
Biswas, Indroindro.biswas (at) dlr.deUNSPECIFIED
Schulze, MatthiasMatthias.Schulze (at) dlr.deUNSPECIFIED
Helmly, Stefanstefan.helmly (at) dlr.deUNSPECIFIED
Friedrich, Kaspar AndreasAndreas.Friedrich (at) dlr.deUNSPECIFIED
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:PEFC, water management, degradation, local measurements, current density distributions
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Garcia Sanchez, Dr Daniel
Deposited On:26 Jun 2017 10:23
Last Modified:31 Jul 2019 20:07

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