000906137 001__ 906137
000906137 005__ 20240712113241.0
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000906137 0247_ $$2URN$$aurn:nbn:de:0001-2022040529
000906137 020__ $$a978-3-95806-606-9
000906137 037__ $$aFZJ-2022-01250
000906137 041__ $$aGerman
000906137 1001_ $$0P:(DE-Juel1)176190$$aSietmann, Michael$$b0$$eCorresponding author$$gmale$$ufzj
000906137 245__ $$aPotentialfeldmessungen zur Qualitätsbewertung von Bipolarplatten$$f- 2021-11-25
000906137 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2021
000906137 300__ $$aix, 160 S.
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000906137 3367_ $$2ORCID$$aDISSERTATION
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000906137 3367_ $$02$$2EndNote$$aThesis
000906137 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1648199851_12754
000906137 3367_ $$2DRIVER$$adoctoralThesis
000906137 4900_ $$aSchriften des Forschungszentrums Jülich. Reihe Energie & Umwelt / Energy & Environment$$v564
000906137 502__ $$aRWTH Aachen, Diss., 2021$$bDissertation$$cRWTH Aachen$$d2021
000906137 520__ $$aTo make fuel cells accessible to a broader application, cost reduction is necessary. An important component of the fuel cell with great cost reduction potential is the bipolar plate. At the same time, the quality of the bipolar plate is of decisive importance for the function of a fuel cell and its longevity. New test methods are needed for the quality assurance of the bipolar plate. In this work, a method and a test setup based on the propagation of the electric potential field is developed for the detection of defects in graphite composite bipolar plates and bipolar plate materials. A current is passed through the bipolar plate via a point contact. With measuring points around the contacting point, the potential field in the bipolar plate can be recorded and analyzed for disturbances. Central elements of the test setup are two probes with 25 spring-loaded measuring tips, which are moved over the bipolar plate. Depending on the programming, the measuring tips conduct a current through the sample or measure the potential field forming in the sample. X-ray tomography and electrical potential simulations are used as a reference and to evaluate the measurement results of the test setup. The measurement method is tested and potential measurement uncertainties are identified on material strips of blank plates with through holes as defined artificial defects. A complex electrical conductivity network is formed in the graphite composite bipolar plates by the graphite particles. The conductivity network becomes visible as measurement noise in the results of the potential field measurements. The application of the measurement method to bipolar plates is demonstrated on monopolar plates withone-sided flow field, in which artificial defects are imitated by plastic accumulations, admixed wood and steel particles. The plastic accumulations represent non-conductive regions in the bipolar plate and the wood particles represent isolated defects such as cracks, voids or non-conductive foreign bodies. Massive defects such as plastic accumulations can be identified with the test setup and their local manifestations determined. Isolated defects, on the other hand, are not detected with the test setup. Ohmic resistance measurements on the monopolar plates and cutouts from the monopolar plates prove that only large-scale defects have a negative influence on the electrical conductivity of bipolar plates. Fuel cell tests with the monopolar plates confirm the results of the ohmic resistance measurements, according to which isolated defects have no influence on ohmic resistance and fuel cell performance. The developed test set-up is suitable for random measurement of electrical properties and detection of performance-impairing defects in bipolar plates.
000906137 536__ $$0G:(DE-HGF)POF4-1231$$a1231 - Electrochemistry for Hydrogen (POF4-123)$$cPOF4-123$$fPOF IV$$x0
000906137 8564_ $$uhttps://juser.fz-juelich.de/record/906137/files/Energie_Umwelt_564.pdf$$yOpenAccess
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000906137 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)176190$$aForschungszentrum Jülich$$b0$$kFZJ
000906137 9131_ $$0G:(DE-HGF)POF4-123$$1G:(DE-HGF)POF4-120$$2G:(DE-HGF)POF4-100$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$9G:(DE-HGF)POF4-1231$$aDE-HGF$$bForschungsbereich Energie$$lMaterialien und Technologien für die Energiewende (MTET)$$vChemische Energieträger$$x0
000906137 9141_ $$y2022
000906137 920__ $$lyes
000906137 9201_ $$0I:(DE-Juel1)IEK-14-20191129$$kIEK-14$$lElektrochemische Verfahrenstechnik$$x0
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