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Analysis of the regeneration behavior of high temperature polymer electrolyte membrane fuel cells after hydrogen starvation

Yezerska, Khrystyna and Liu, Fang and Dushina, Anastasia and Sergeev, Oleg and Wagner, Peter and Dyck, Alexander and Wark, Michael (2019) Analysis of the regeneration behavior of high temperature polymer electrolyte membrane fuel cells after hydrogen starvation. Journal of Power Sources, 449, p. 227562. Elsevier. doi: 10.1016/j.jpowsour.2019.227562. ISSN 0378-7753.

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Official URL: http://www.sciencedirect.com/science/article/pii/S0378775319315551

Abstract

Two high temperature polymer exchange membrane fuel cells (HT-PEM FCs) were operated under repeated starvation/regeneration steps for 550 min (DPS-1) and 12 days (DPS-2). Concerning the investigation of the irreversible degradation under fuel (H2) starvation the focus was put on the electrochemical characteristics during regeneration, since during this step the system operates under normal conditions. Electrochemical impedance spectroscopy (EIS) and distribution of relaxation times (DRT) analysis were used as electrochemical characterization methods. DRT analysis of selected impedance spectra during regeneration steps for the first seven days revealed an intensity increase of the charge transfer kinetics of the cathode (ca. 10 Hz) and the anode (ca. 100 Hz). From day 3 on, an additional peak at 300-800 Hz appeared likely pointing to the formation of surface oxides at the anode side. The EIS and DRT results were verified with Focused Ion Beam-Scanning Electron Microscopy (FIB-SEM), Microcomputed Tomography (µ-CT) and Transmission Electron Microscopy (TEM). While TEM indicated advanced Pt particle agglomeration pointing to carbon corrosion, µ-CT measurements showed an increase of void volume fraction and a decrease of the tortuosity value. The combined results show that the anode gas outlet region of the FC is more degraded than the inlet region.

Item URL in elib:https://elib.dlr.de/132668/
Document Type:Article
Title:Analysis of the regeneration behavior of high temperature polymer electrolyte membrane fuel cells after hydrogen starvation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Yezerska, Khrystynakhrystyna.yezerska (at) dlr.dehttps://orcid.org/0000-0003-4657-2381
Liu, FangDLR Institute of Networked Energy SystemsUNSPECIFIED
Dushina, Anastasiaanastasia.dushina (at) dlr.dehttps://orcid.org/0000-0003-4193-9906
Sergeev, Olegoleg.sergeev (at) dlr.deUNSPECIFIED
Wagner, Peterp.wagner (at) dlr.dehttps://orcid.org/0000-0002-5644-9881
Dyck, Alexanderalexander.dyck (at) dlr.dehttps://orcid.org/0000-0002-5010-8226
Wark, MichaelCarl von Ossietzky Universityhttps://orcid.org/0000-0002-8725-0103
Date:11 December 2019
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:449
DOI :10.1016/j.jpowsour.2019.227562
Page Range:p. 227562
Publisher:Elsevier
ISSN:0378-7753
Status:Published
Keywords:HT-PEM FC, Starvation, Regeneration, EIS, DRT, Carbon corrosion
HGF - Research field:Energy
HGF - Program:Technology, Innovation and Society
HGF - Program Themes:Renewable Energy and Material Resources for Sustainable Futures - Integrating at Different Scales
DLR - Research area:Energy
DLR - Program:E SY - Energy Systems Analysis
DLR - Research theme (Project):E - Energy Systems Technology (old)
Location: Oldenburg
Institutes and Institutions:Institute of Networked Energy Systems > Fuel Cells
Deposited By: Lorenz, Julian
Deposited On:16 Dec 2019 12:33
Last Modified:25 May 2020 10:30

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