Fabrication and Impedance Performance of Gradient LaNi_0.6Fe_0.4O_3-δ-Gd_0.2Ce_0.8O₂ Composite Cathodes for Intermediate Temperature Solid Oxide Fuel Cell

Authors

Yang LI, Institute of Fuel Cell, School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;
Bo HUANG, Institute of Fuel Cell, School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;Follow
Meng YUAN, Institute of Fuel Cell, School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;
Zhi-qiu ZHANG, Institute of Fuel Cell, School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;
Zong-yao LIU, Institute of Fuel Cell, School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;
Xu-chen TANG, Institute of Fuel Cell, School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;
Xin-jian ZHU, Institute of Fuel Cell, School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China;

Corresponding Author

Bo HUANG(huangbo2k@hotmail.com)

Abstract

A LNF-GDC composite cathode with a gradual change in the composition between ScSZ electrolyte and LNF cathode was fabricated to reduce the cathode polarization resistance (R_p). The gradual change in composition between ScSZ electrolyte and LNF cathode shows the decreases in the charge transfer resistance (R_ct) and gas phase diffusion resistance (R_d). The results revealed that the Rp value, measuring 0.452 Ω·cm² at 750 °C, was the lowest for LNF-GDC composite cathodes with three layers and gradient changes in composition between ScSZ and LNF (Cathode C),, whereas the Rp value of 70%LNF-30%GDC composite cathodes with one layer (Cathode A) was 0.581 Ω·cm². The reduction in Rp for the LNF-GDC composite cathodes with three layers and gradient changes in composition between ScSZ and LNF may be related to the fact that the microstructure of the cathode/electrolyte interfaces is significantly improved, resulting in the increase in the area of triple phase boundaries (TPBs), which enhanced the surface exchange of oxygen. This implied that the gradient LNF-GDC composite cathodes showed excellent performance in terms of its electrochemical properties.

Graphical Abstract

Keywords

solid oxide fuel cell, LaNi0.6Fe0.4O3-δ cathode, gradient cathode, polarization resistance, electrochemical impedance spectroscopy

DOI Link

https://doi.org/10.13208/j.electrochem.121206

Publication Date

2014-02-25

Online Available Date

2014-02-24

Revised Date

2013-02-21

Received Date

2012-12-06

Recommended Citation

Yang LI, Bo HUANG, Meng YUAN, Zhi-qiu ZHANG, Zong-yao LIU, Xu-chen TANG, Xin-jian ZHU. Fabrication and Impedance Performance of Gradient LaNi_0.6Fe_0.4O_3-δ-Gd_0.2Ce_0.8O₂ Composite Cathodes for Intermediate Temperature Solid Oxide Fuel Cell[J]. Journal of Electrochemistry, 2014 , 20(1): 45-50.
DOI: 10.13208/j.electrochem.121206
Available at: https://jelectrochem.xmu.edu.cn/journal/vol20/iss1/8