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Study of SOFC Operational Behavior by Applying In-Situ Diagnostic Methods

Schiller, Günter and Bessler, Wolfgang G. and Willich, Caroline and Friedrich, K. Andreas (2010) Study of SOFC Operational Behavior by Applying In-Situ Diagnostic Methods. In: Fuel Cell Seminar 2010 Abstract Book, pp. 161-166. 2010 Fuel Cell Seminar & Exposition, 18.-21. Okt. 2010, San Antonio, USA.

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Abstract

High electrical performance and long lifetime are key requirements that must be fulfilled for a successful introduction of fuel cells into the market. For achieving a high efficiency, a high fuel utilization is required. This requirement, on the other hand, results in strong concentration gradients at the anode where the fuel is successively diluted by reaction products during the reaction process and, hence, in an inhomogeneous distribution of electrochemical performance and temperature. Inhomogeneous distributions of electrochemical and thermal properties such as local power density and local temperature might detrimentally affect both efficiency and long-term durability through thermo-mechanical stress and degradation phenomena. In order to optimize the operational behavior of fuel cells and minimize cell degradation the application of advanced diagnostic methods by monitoring cell characteristics under real operating conditions can provide detailed information about the spatial distribution of the electrical, chemical and thermal cell properties. DLR has developed spatially resolved diagnostic techniques with a segmented cell arrangement where different techniques such as IV characteristics, impedance spectroscopy, gas chromatography and temperature measurement are involved [1, 2]. The segmented cell setup allows a largely extended insight into fuel cell processes both for increasing the fundamental understanding and for optimizing cell and flow field design. The obtained data can be used for mathematical modeling and model validation and for predicting physical, electrochemical and fluid mechanical properties [3, 4]. Recently, imaging techniques such as optical microscopy and Raman spectroscopy have been additionally adopted for in-situ observation of fuel cells. The paper gives an overview of in-situ diagnostic methods applied at DLR Stuttgart for the determination of local effects and the identification of critical operating conditions during technically relevant SOFC operation. Exemplary results from experimental investigations are presented.

Item URL in elib:https://elib.dlr.de/66676/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Study of SOFC Operational Behavior by Applying In-Situ Diagnostic Methods
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schiller, Günterguenter.schiller (at) dlr.deUNSPECIFIED
Bessler, Wolfgang G.wolfgang.bessler (at) dlr.deUNSPECIFIED
Willich, Carolinecaroline.willich (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:October 2010
Journal or Publication Title:Fuel Cell Seminar 2010 Abstract Book
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 161-166
Status:Published
Keywords:SOFC, in-situ diagnostics, segmented cell, spatially resolved measurements, degradation behavior, imaging techniques
Event Title:2010 Fuel Cell Seminar & Exposition
Event Location:San Antonio, USA
Event Type:international Conference
Event Dates:18.-21. Okt. 2010
Organizer:Fuel Cell Seminar & Exposition Conference Management
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E BZ - Fuel cells (old)
DLR - Research area:Energy
DLR - Program:E BZ - Fuel cells
DLR - Research theme (Project):E - Hochtemperatur-Brennstoffzellen (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Schiller, Dr.rer.nat. Günter
Deposited On:29 Nov 2010 11:33
Last Modified:31 Jul 2019 19:29

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