LEADER 02976nam 2200397 450 001 9910795567403321 005 20230807203130.0 010 $a3-8325-9868-5 035 $a(CKB)4340000000242722 035 $a(MiAaPQ)EBC5219586 035 $a58a1c68e-f0d0-43da-959a-3edeb0dd2d03 035 $a(EXLCZ)994340000000242722 100 $a20180521d2015 uy 0 101 0 $aeng 135 $aurcnu|||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aHigh temperature polymer electrolyte membrane fuel cells $emodeling, simulation, and segmented measurements /$fChristian Siegel 210 1$aBerlin :$cLogos Verlag,$d[2015] 210 4$dİ2015 215 $a1 online resource (182 pages) 300 $aPublicationDate: 20150320 311 $a3-8325-3917-4 330 $aLong description: A three-dimensional computational fluid dynamics model of a high temperature polymer electrolyte membrane fuel cell, employing a high temperature stable polybenzimidazole membrane electrode assembly doped with phosphoric acid, was developed and implemented using a commercially available finite element software. Three types of flow-fields were modeled and simulated. Selected simulation results at reference operating conditions were compared to the performance curves and to segmented solid-phase temperature and current density measurements. For the segmented measurements, an inhouse developed prototype cell was designed and manufactured. The segmented cell was successfully operated and the solid-phase temperature and the current density distribution were recorded, evaluated, and discussed. Sequentially scanned segmented electrochemical impedance spectroscopy measurements were performed to qualitatively support the observed trends. These measurements were used to identify and determine the causes of the inhomogeneous current density distributions. An equivalent circuit model was developed, the obtained spectra were analyzed, and the model parameters discussed. This work helps to provide a better understanding of the internal behaviour of a running high temperature polymer electrolyte membrane fuel cell and presents valuable data for modeling and simulation. For large fuel cells and complete fuel cell stacks in particular, well designed anode and cathode inlet and outlet sections are expected to aid in achieving flatter quantities distributions and in preventing hot spots over the membrane electrode assembly area, and to develop proper start-up, shut-down, and tempering concepts. 606 $aProton exchange membrane fuel cells$xReliability 615 0$aProton exchange membrane fuel cells$xReliability. 676 $a621.312429 700 $aSiegel$b Christian$0683638 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a9910795567403321 996 $aHigh temperature polymer electrolyte membrane fuel cells$93827224 997 $aUNINA