Accession Number:

ADP011210

Title:

The Role of Electrode Microstructure on Activation and Concentration Polarizations in Solid Oxide Fuel Cells

Descriptive Note:

Corporate Author:

UTAH UNIV SALT LAKE CITY DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s):

• Virkar, Anil V.
• Chen, Jong
• Tanner, Cameron W.
• Kim, Jai-Woh

Report Date:

1999-12-01

Pagination or Media Count:

10.0

Abstract:

Activation and concentration polarization effects in anode-supported solid oxide fuel cells SOFC were examined. The anode and the cathode consisted respectively of porous, composite, contiguous mixtures of Ni yttria-stabilized zirconia YSZ and Sr-doped LaMnO3 LSM YSZ. The composite electrode provides parallel paths for oxygen ions through YSZ, electrons through the electronic conductor Ni for the anode and LSM for the cathode, and gaseous species through the pores and thereby substantially decreases the activation polarization. The composite electrode effectively spreads the charge transfer reaction from the electrolyteelectrode interface into the electrode.

Descriptors:

• *POLARIZATION
• *FUEL CELLS
• IONS
• ELECTROCHEMISTRY
• ELECTRONS
• CATHODES
• OXIDES
• ELECTRODES
• CHARGE TRANSFER
• POROUS MATERIALS
• ELECTROLYTIC CELLS
• ANODES
• SOLID FUELS

Subject Categories:

• Physical Chemistry
• Electrochemical Energy Storage

Distribution Statement:

APPROVED FOR PUBLIC RELEASE