TiO2-modified La0.6Sr0.4Co0.2Fe0.8O3-δ cathode for intermediate temperature solid oxide fuel cells

A La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode modified using nanosized TiO2 was direct prepared on the yttria stabilized zirconia (YSZ) electrolyte in an intermediate temperature solid oxide fuel cell. TiO2 prevents reaction between LSCF and YSZ, which would have formed a SrZrO3 phase. The cell with a LSCF-0.25 wt% TiO2 cathode exhibited a current density that was 1.6 times larger than that with a pure LSCF cathode at 0.7 V and 600 °C. Electrochemical impedance spectra showed the accelerated incorporation of oxygen anions into the YSZ electrolyte with the TiO2-modified LSCF cathode. The improvement was attributed to the suppressed formation of a non-conductive SrZrO3 layer at the cathode/electrolyte interface.

Graphical AbstractA TiO2-modified La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode directly prepared on the YSZ electrolyte improved the fuel cell performance. This was attributed to the suppressed formation of a non-conductive SrZrO3 layer at the cathode/electrolyte interface.Figure optionsDownload as PowerPoint slide