Fabrication and Performance of LaNi_0.6Fe_0.4O_3-δ Cathode Modified by Coating with Gd_0.2Ce_0.8O₂ for Intermediate Temperature Solid Oxide Fuel Cell

Authors

Rui-xuan REN
Bo HUANG
Xin-jian ZHU
Yi-xing Hu
Xiao-yi DING
Zong-yao LIU
Ye-bin LIU

Corresponding Author

Bo HUANG(huangbo2k@hotmail.com)

Abstract

The symmetric cell of LaNi_0.6Fe_0.4O_3-δ/Sc_0.1Zr_0.9O_1.95/LaNi_0.6Fe_0.4O _3-δ was fabricated with screen printing method. A LaNi_0.6Fe_0.4O_3-δ (LNF) cathode was modified by coating with nano-sized gadolinium-doped ceria (GDC, Gd_0.2Ce_0.8O₂) prepared using a simple combustion process within the pores of the cathode. According to the electrochemical impedance spectra (EIS), the polarization resistance of the pure LNF was 0.70 W·cm² at 750 ºC, while 0.13 W·cm² for the 21.3% GDC (by mass)-coated LNF cathode at the same temperature, which was only 1/5 of that of the pure LNF cathode. The activation energy of the 21.3% GDC (by mass)-coated LNF cathode (136.80 kJ·mol^-1) is the smallest among those of GDC-coated LNF cathodes with different contents of GDC. The 21.3% GDC (by mass)-coated LNF cathode showed the optimum performance. The results indicated that GDC coatings significantly affected electrocatalytic activity of the LNF cathodes towards O2 reduction reaction. The improved performance of GDC-coated LNF cathode was attributed to the extended triple-phase boundary (TPB) and enhanced ion conductivity of oxide.

Keywords

solid oxide fuel cell, LaNi0.6Fe0.4O3-δcathode, Gd0.2Ce0.8O2 coating, polarization resistance, electrochemical impedance spectroscopy

DOI Link

https://doi.org/10.61558/2993-074X.2960

Publication Date

2013-06-28

Online Available Date

2013-06-28

Revised Date

2012-06-05

Received Date

2012-04-24

Recommended Citation

Rui-xuan REN, Bo HUANG, Xin-jian ZHU, Yi-xing Hu, Xiao-yi DING, Zong-yao LIU, Ye-bin LIU. Fabrication and Performance of LaNi_0.6Fe_0.4O_3-δ Cathode Modified by Coating with Gd_0.2Ce_0.8O₂ for Intermediate Temperature Solid Oxide Fuel Cell[J]. Journal of Electrochemistry, 2013 , 19(3): Article 13.
DOI: 10.61558/2993-074X.2960
Available at: https://jelectrochem.xmu.edu.cn/journal/vol19/iss3/13

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