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

doi:10.1016/S1872-2067(14)60235-7

Chinese Journal of Catalysis ›› 2015, Vol. 36 ›› Issue (4): 502-508.DOI: 10.1016/S1872-2067(14)60235-7

• Special Column on Electrocatalysis for Fuel Cells • Previous Articles Next Articles

TiO₂-modified La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ cathode for intermediate temperature solid oxide fuel cells

Weixing Liu^a,b, Zhe Zhao^a, Baofeng Tu^a, Daan Cui^a, Dingrong Ou^a, Mojie Cheng^a

a Division of Fuel Cells, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
b University of Chinese Academy of Sciences, Beijing 100049, China

Received:2014-07-18 Revised:2014-09-22 Online:2015-03-23 Published:2015-03-23
Supported by:
This work was supported by the National High Technology Research and Development Program of China (863 Program, 2011AA050704), the National Basic Research Program of China (973 Program, 2010CB732302, 2012CB215500), and the National Natural Science Foundation of China (21376238, 21306189, and 51101146).

Abstract

Abstract:

A La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ(LSCF) cathode modified using nanosized TiO₂was 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 ℃. 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.

Key words: Intermediate temperature solid oxide fuel cell, Cathode, Titanium oxide, Interfacial reaction, Zirconia-based electrolyte

Weixing Liu, Zhe Zhao, Baofeng Tu, Daan Cui, Dingrong Ou, Mojie Cheng. TiO₂-modified La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ cathode for intermediate temperature solid oxide fuel cells[J]. Chinese Journal of Catalysis, 2015, 36(4): 502-508.

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TiO₂-modified La_0.6Sr_0.4Co_0.2Fe_0.8O_3-δ cathode for intermediate temperature solid oxide fuel cells

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