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

# All-Perovskite Solid Oxide Fuel Cells, Synthesis and Characterization

[+] Author and Article Information

Department of Chemical, Materials and Biomolecular Engineering, University of Connecticut, Storrs, CT 06269

Tsung-han Wu

Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269

Nigel M. Sammes

Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401

J. Fuel Cell Sci. Technol 6(2), 021308 (Mar 04, 2009) (5 pages) doi:10.1115/1.3080554 History: Received January 30, 2008; Revised April 28, 2008; Published March 04, 2009

## Abstract

Strontium- and magnesium-doped lanthanum gallate (LSGM) has been considered as a promising electrolyte for solid oxide fuel cell (SOFC) systems in recent years. In this work synthesis, electrochemical properties, phase evolution, and microstructure of an all-perovskite electrolyte-supported SOFC based on $La0.75Sr0.25Cr0.5Mn0.5O3$ (LSCM) porous anode, $La0.8Sr0.2Ga0.7Mg0.3O2.8$ (LSGM-2030) electrolyte, and $La0.8Sr0.2MnO3$ cathode at intermediate temperatures are studied. The phase evolution of synthesized LSGM and LSCM powders has been investigated, and it validates that there is no reaction between LSGM and LSCM at sintering temperature. The characterization study of the synthesized LSGM also indicates that sintering at $1500°C$ gives higher electrical conductivity compared with the currently published results, while for the pellets sintered at $1400°C$ and $1450°C$ the conductivity would be slightly lower. The effects of the firing temperature on the bulk and grain boundary resistivities are also discussed.

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## Figures

Figure 1

Processing flow chart for the sol-gel synthesis of the LSGM powder

Figure 2

Processing flow chart for the synthesis of the LSCM powder

Figure 3

SEM microstructures of (a) electrolyte, (b) cathode, and (c) anode with 5 wt % of potato-fiber poreformer. The indicated bars correspond to 10 μm.

Figure 4

Density of the LSGM electrolyte sintered at (a) 1400°C and (b) 1500°C

Figure 5

SEM micrographs of (a) electrolyte and cathode interface and (b) electrolyte and anode interface indicate good adhesion between electrolyte and electrodes. The indicated bars correspond to 10 μm.

Figure 6

XRD patterns showing phase evolution of the LSGM powder during heat treatment

Figure 7

XRD patterns showing the phase evolution of the LSCM powder

Figure 8

XRD patterns of a pressed LSGM+LSCM (50:50) powder mixture before and after heat treatment at 1400°C for 20 h

Figure 9

ac impedance results as a function of temperature for LSGM electrolyte pellets sintered at (a) 1400°C and (b) 1450°C

Figure 10

Total conductivity of LSGM pellets fired at 1400°C, 1450°C, and 1500°C

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