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SPECIAL SECTION ON THE 2ND EUROPEAN FUEL CELL TECHNOLOGY AND APPLICATIONS CONFERENCE

Advances in Research, Development, and Testing of Single Cells at Forschungszentrum Jülich

[+] Author and Article Information
V. A. C. Haanappel1

Institute for Energy Research, Forschungszentrum Jülich, D-52425 Jülich, Germanyv.haanappel@fz-juelich.de

N. Jordan, J. Mertens, F. Tietz, S. Uhlenbruck, I. C. Vinke, M. J. Smith, L. G. J. de Haart

Institute for Energy Research, Forschungszentrum Jülich, D-52425 Jülich, Germany

A. Mai

 Hexis AG, Hegifeldstrasse 30, CH-8404 Winterthur, Switzerland

J. M. Serra

 Instituto de Tecnología Química (UPV-CSIC), Avenida Los Naranjos S/N, E-46022 Valencia, Spain

The Fuel-Cell Project Office website at http://www.fz-juelich.de/ief/ief-pbz/pbzhome.

1

Corresponding author.

J. Fuel Cell Sci. Technol 6(2), 021302 (Feb 26, 2009) (10 pages) doi:10.1115/1.3080547 History: Received January 07, 2008; Revised February 20, 2008; Published February 26, 2009

This paper presents an overview of the main advances in solid oxide fuel cells (SOFCs) research and development (R&D), measurement standardization, and quality assurance in SOFC testing at the Forschungszentrum Jülich. These activities have resulted in both a significant improvement of the electrochemical performance and a better understanding of the electrochemical behavior of SOFCs. Research and development of SOFCs was mainly focused on two types of anode-supported cells, namely, those employing either La0.65Sr0.3MnO3 (LSM) or La0.58Sr0.4Co0.2Fe0.8O3δ (LSCF) cathode materials. In both cases the optimization of processing and microstructural parameters resulted in satisfactory power output and long-term stability at reduced operation temperatures. Standardization and quality assurance in SOFC testing was also addressed with the goal of producing consistent and reliable tests and measurement results. At present, under optimized experimental conditions, SOFCs with LSM or LSCF cathodes can deliver a power output of about 1.0W/cm2 and 1.9W/cm2 at 800°C (700 mV), respectively.

Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Two types of testing housing for ASC single cell testing at Forschungszentrum Jülich: (left) first type testing housing; (right) present testing housing

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Figure 2

Cell voltage curves for 50×50 mm2 anode-supported single cells with LSM cathode as function of the temperature and mesh size. Fuel gas: H2(3% H2O)=1000 ml/min; oxidant: air=1000 ml/min.

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Figure 3

Current density of anode-supported SOFCs with LSM cathode as function of the applied mechanical load

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Figure 4

OCV for a 50×50 mm2 anode-supported SOFC with LSCF cathode as a function of the reduction steps

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Figure 5

Status of development of anode-supported SOFCs with LSM cathode at FZJ

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Figure 6

SEM micrograph of the fracture surface of a cell with LSM cathode (type 4)

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Figure 7

Current density at 700 mV of SOFCs with LSM cathode between 700°C and 900°C as function of the YSZ/LSM ratio of the cathode functional layer

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Figure 8

Current density at 700 mV of SOFCs with LSM cathode between 700°C and 900°C as a function of the type (TC: tape casting; WP: warm pressing) and presintering temperature of the anode substrate

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Figure 9

Cell voltage versus operation time for a 50×50 mm2 anode-supported SOFC with LSM cathode under thermal cycling conditions (800°C; 0.3 A/cm2)

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Figure 10

Evolution of ASC single cell performance employing LSCF cathode materials at FZJ

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Figure 11

Micrographs and current-voltage curves at 750°C of single cells with LSCF cathodes sintered at various temperatures including a CGO interlayer

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Figure 12

Current density at 700 mV of anode-supported SOFCs with LSCF cathode as function of the sintering temperature of the CGO diffusion barrier layer

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Figure 13

SEM micrographs of the fracture surface of various CGO diffusion barrier layers: (a) applied by screen printing (d50=0.2 μm); (b) applied by EB-PVD (after annealing for 3 h at 1080°C for cathode sintering)

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Figure 14

Cell voltage versus operation time for a 50×50 mm2 anode-supported SOFC with LSCF cathode under constant current load (800°C; 0.5 A/cm2)

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Figure 15

Current density of anode-supported SOFCs with Nd2NiO4 cathode as function of the sintering temperature of the cathode layer

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Figure 16

Current density of anode-supported SOFCs with M0.68Sr0.3Co0.2Fe0.8O3−δ cathode as function of the temperature

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