Title

Impact Of Temperature And Porosity On Sc2O3-Ceo 2-Zro2 Intermediate Temperature Solid Oxide Fuel Cells Performance

Abstract

Two commercial 10mol% Sc2O3 - 1mol% CeO2 -ZrO2 powders manufactured by Praxair Surface Technologies, Specialty Ceramics, USA and DKKK, Japan were compared for use as an electrolyte material for Intermediate Temperature SOFCs. Single element SOFCs were developed using ScCeZrO2 dense ceramics as an electrolyte, composite 50 wt% La 0.6Sr0.4Fe0.8Co0.2O3 (LSFC) + 50 wt% Gd2O3 + CeO2 (GDC) porous ceramics as a cathode, and Ni-ScCeZrO2 cermet as an anode. It is found that the ScCeZrO2 DKKK powder densifies more easily than that of Praxair powder. It is also found that the optimal sintering temperature for 50wt% LSFC - 50wt% GDC cathode powders is 1100°C to 1200°C, but that sintering begins as low as 800°C. The optimal sintering temperature for the 50 wt% DKKK ScCeZrO2 - 50 wt% NiO anode powder is between 1050°C and 1100°C. The electrolyte tapes have been produced by the tape casting followed by sintering at 1500°C for 2 hours. Then, the anode and cathode has been screen printed on both sides of the electrolyte layer. Completed button cells containing the screen printed anode and cathode were sintered in air at 1100°C for 2 hours. Button cells were tested at 800°C using a 97% H 2 and 3% H2O on the anode side and air on the cathode side. The first preliminary results showed the cell performance of only 22 mW/cm2 maximum power density achieved at 0.7 V. This poor performance may be due to the sintering of the electrodes during testing and the formation of poorly conducting secondary phases at one of the electrode/electrolyte interfaces. The performance of the cell is modeled using one-dimensional model, which showed that most of the losses are due to diffusion and contact resistance. Copyright © 2009 by University of Central Florida.

Publication Date

1-1-2009

Publication Title

47th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.2514/6.2009-1207

Socpus ID

78549238230 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/78549238230

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