Dreizler, Andreas and Ruiu, Tiziana and Mitzel, Jens and Gülzow, Erich (2015) Development and Characterization of a LT-PEFC Stack with an Extended Temperature Range up to 120 °C. 5th European PEFC & H2 Forum, 2015-06-30 - 2015-07-03, Luzern, Schweiz.
![]() |
PDF
3MB |
Abstract
Usually, the operation temperature of a polymer electrolyte fuel cell (PEFC) stack for automotive application has its maximum at about 80 °C. The work presented here concerns the characterization of a 30-cell PEFC stack (2.5 kWel) developed at the German Aerospace Center, designed for operating temperatures up to 120 °C for a limited time. The possibility to run the stack at higher temperatures for a short time would contribute to the improvement of cooling system components with scaled-down dimensions. Those measures help to reduce the vehicle weight and thus to save fuel. In this contribution we present the current-voltage characteristic curves and the homogeneity obtained along the cells. Moreover, in order to investigate the stack behaviour at extended operating temperatures, a series of 20 temperature cycles from 90 to 120 °C were performed at galvanostatic conditions of 70 A (approx. 0.5 A·cm–2 and 1.5 kWel). The results are promising, since only a slight irreversible degradation was observed during the thermal cycling. Furthermore, the results of a 1200 hours long-term stability test are shown, including an end-of-life cyclovoltammetric characterization, performed on all 30 cells. The electrochemical analysis can help to find out possible causes of degradation due to catalyst or electrode degradation, and to determine hydrogen crossover rates, electrochemically active surface areas (EASAs) and electrical short-circuit resistances of each cell.
Item URL in elib: | https://elib.dlr.de/98786/ | ||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Document Type: | Conference or Workshop Item (Poster) | ||||||||||||||||||||
Title: | Development and Characterization of a LT-PEFC Stack with an Extended Temperature Range up to 120 °C | ||||||||||||||||||||
Authors: |
| ||||||||||||||||||||
Date: | 30 June 2015 | ||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||
Open Access: | Yes | ||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||
In SCOPUS: | No | ||||||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||||||
Status: | Published | ||||||||||||||||||||
Keywords: | PEMFC Stack, Extended Temperature Range, Thermal Cycling, Long-term Test, End-of-Life Characterization | ||||||||||||||||||||
Event Title: | 5th European PEFC & H2 Forum | ||||||||||||||||||||
Event Location: | Luzern, Schweiz | ||||||||||||||||||||
Event Type: | international Conference | ||||||||||||||||||||
Event Start Date: | 30 June 2015 | ||||||||||||||||||||
Event End Date: | 3 July 2015 | ||||||||||||||||||||
Organizer: | European Fuel Cell Forum | ||||||||||||||||||||
HGF - Research field: | Energy | ||||||||||||||||||||
HGF - Program: | Efficient Energy Conversion and Use (old) | ||||||||||||||||||||
HGF - Program Themes: | Fuel Cells (old) | ||||||||||||||||||||
DLR - Research area: | Energy | ||||||||||||||||||||
DLR - Program: | E EV - Energy process technology | ||||||||||||||||||||
DLR - Research theme (Project): | E - Electrochemical Processes (old) | ||||||||||||||||||||
Location: | Stuttgart | ||||||||||||||||||||
Institutes and Institutions: | Institute of Engineering Thermodynamics > Electrochemical Energy Technology | ||||||||||||||||||||
Deposited By: | Dreizler, Dr. Andreas | ||||||||||||||||||||
Deposited On: | 22 Oct 2015 12:50 | ||||||||||||||||||||
Last Modified: | 24 Apr 2024 20:04 |
Repository Staff Only: item control page