The Role of Electrode Microstructure on Activation and Concentration Polarizations in Solid Oxide Fuel Cells
UTAH UNIV SALT LAKE CITY DEPT OF MATERIALS SCIENCE AND ENGINEERING
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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.
- Physical Chemistry
- Electrochemical Energy Storage