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Research Papers

Characterization of Anode-Supported Solid Oxide Fuel Cells With PSCF Cathode

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

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

A. Mai

 Hexis AG, Hegifeldstrasse 30, 8404 Winterthur, Switzerland

S. Uhlenbruck, F. Tietz

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

1

Corresponding author.

J. Fuel Cell Sci. Technol 6(1), 011007 (Nov 04, 2008) (6 pages) doi:10.1115/1.2971049 History: Received March 30, 2007; Revised June 11, 2007; Published November 04, 2008

A systematic study was initiated of anode-supported single cells with Pr0.58Sr0.4Co0.2Fe0.8O3δ (PSCF) cathode. These solid oxide fuel cells (SOFCs) were characterized by electrochemical and diffusion and permeation measurements. In particular, the influence of various sintering temperatures of the cathode and various types of Ce0.8Gd0.2O2δ (CGO) interlayer was investigated in more detail. Results from electrochemical measurements performed between 650°C and 800°C showed that the performance of anode-supported SOFCs with screen-printed porous CGO interlayer and a PSCF cathode was excellent. Even at 650°C, the area-specific resistance was lower than 0.5Ωcm2. The microstructure of the cathode and the performance of this type of SOFC were not obviously affected by variations in the sintering temperature of the cathode. Higher electrochemical performance, in particular, in the temperature range 650750°C, was achieved by applying a thin and dense CGO interlayer using reactive sputtering or electron beam physical vapor deposition.

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Figures

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Figure 1

SEM micrographs of fracture surface of cells with PSCF cathode sintered at 1000°C and a CGO interlayer applied by screen printing: (a) SE micrograph and (b) BE micrograph

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Figure 2

SEM micrographs of fracture surface of cells with PSCF cathode sintered at 1060°C and a CGO interlayer applied by screen printing: (a) complete SOFC, (b) SE micrograph, and (c) BE micrograph

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Figure 3

Current–voltage curves for a 16cm2 PSCF-type single cell (sintering temperature cathode: 1040°C) between 650°C and 800°C. Fuel gas: H2(3%H2O)=1000ml∕min; oxidant: air=1000ml∕min

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Figure 4

Transport parameters from the MTPM as function of the sintering temperature of the PSCF-type cathode: (a) mean pore radius ⟨r⟩, (b) mean square of the radius of the transport pores ⟨r2⟩, and (c) Ψ factor

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Figure 5

SEM micrographs of the fracture surface of various CGO diffusion barrier layers: (a) applied by screen printing (d50=0.2μm) and (b) applied by EB-PVD (after annealing for 3h at 1040°C for cathode sintering)

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Figure 6

SEM micrographs of fracture surface of cells with PSCF cathode sintered at 1040°C and a CGO interlayer applied by EB-PVD: (a) SE micrograph and (b) BE micrograph

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Figure 7

Cell output voltage at 750°C as a function of exposure time; the constant electrical load was set at 0.5A∕cm2 (fuel gas: H2(3%H2O)=1000ml∕min; oxidant: air=1000ml∕min)

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