elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Spatially resolved current density measurements and real-time modelling as a tool for the determination of local operating conditions in polymer electrolyte fuel cells

Knöri, Torsten and Schulze, Mathias (2009) Spatially resolved current density measurements and real-time modelling as a tool for the determination of local operating conditions in polymer electrolyte fuel cells. Journal of Power Sources, 193 (1), pp. 308-314. Elsevier. DOI: 10.1016/j.jpowsour.2008.12.058 ISSN 0378-7753

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/locate/jpowsour

Abstract

In this contribution a simplified, isothermal, two-phase, one-dimensional model for the calculation of the cathodic gas flow along the flow field channels of a polymer electrolyte fuel cell (PEFC) is presented. The composition of the humidified oxidant gas, average gas velocity, pressure drop, and other quantities can be calculated for any gas distributor structures with one channel. Thereby, the model requires several input parameters which have to be determined solely by experiment and pre-defined operation conditions, e.g. the water content of the feed gas, local current densities, and gas flow rates. In contrast to other models, the cross-section reduction has been taken into account which results from the penetration of the gas diffusion layer into the flow field channels due to the mounting pressure. Beyond this, the model needs no fit-parameters for further adjustment. For close examination of the factors limiting the performance of a PEFC, the DLR has developed several techniques for measuring the current density distribution with spatial resolution. In order to investigate the origin of the corresponding effects, one of these techniques has been improved by implementing the model of the cathodic gas flow as an on-line feature. The combination of a spatially resolved measurement technique with a real-time simulation gives a better understanding of the local processes within the cell and represents a helpful tool for the development of fuel cell components as well as for the optimization of the operating conditions. Exemplarily, the presentation the results for a 25 cm2 serpentine flow field at different operation modes are shown in this paper.

Item URL in elib:https://elib.dlr.de/55739/
Document Type:Article
Title:Spatially resolved current density measurements and real-time modelling as a tool for the determination of local operating conditions in polymer electrolyte fuel cells
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knöri, Torstentorsten.knoeri (at) dlr.deUNSPECIFIED
Schulze, Mathiasmathias.schulze (at) dlr.deUNSPECIFIED
Date:2009
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:193
DOI :10.1016/j.jpowsour.2008.12.058
Page Range:pp. 308-314
Publisher:Elsevier
ISSN:0378-7753
Status:Published
Keywords:PEFC, current density distribution, on-line modelling, cathode, flow field
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E EV - Energy process technology (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Elektrochemische Prozesse (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Knöri, Torsten
Deposited On:03 Nov 2009 14:25
Last Modified:10 Jan 2019 15:48

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.