Abstract
The symmetric cell of LaNi0.6Fe0.4O3-δ/Sc0.1Zr0.9O1.95/LaNi0.6Fe0.4O 3-δ was fabricated with screen printing method. A LaNi0.6Fe0.4O3-δ (LNF) cathode was modified by coating with nano-sized gadolinium-doped ceria (GDC, Gd0.2Ce0.8O2) 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
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 LaNi0.6Fe0.4O3-δ Cathode Modified by Coating with Gd0.2Ce0.8O2 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
Included in
Catalysis and Reaction Engineering Commons, Engineering Science and Materials Commons, Materials Chemistry Commons, Materials Science and Engineering Commons, Physical Chemistry Commons, Power and Energy Commons
