A-site deficient (La0.6Sr0.4)(1-x)Co0.2Fe0.6Nb0.2O3-delta symmetrical electrode materials for solid oxide fuel cells

作者：Niu, Bingbing^*; Jin, Fangjun; Feng, Tao; Zhang, Leilei; Zhang, Ying; He, Tianmin^*

来源：Electrochimica Acta, 2018, 270: 174-182.

DOI：10.1016/j.electacta.2018.03.085

• Solid oxide fuel cell
• Symmetrical electrode
• Structural stability
• Hydrocarbon fuel
• Electrochemical performance

A-site deficient (La0.6Sr0.4)(1-x)Co0.2Fe0.6Nb0.2O3-delta (x = 0, 0.05 and 0.10) symmetrical electrodes (hereafter denoted as LSCFN, LSCFN5, and LSCFN10, respectively) are obtained by doping Nb at the B site of La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) cathode. All three electrodes display excellent structural stability both in cathode and anode conditions. The thermal expansion coefficients of the electrodes range within 13.4 -14.3 x 10(-6) K-1 at 30-900 degrees C in air and 5% H-2/Ar, and these values are close to those of common electrolytes. Furthermore, 20-h electrochemical impedance stability test results indicate that LSCFN10 as anode or cathode possesses excellent electrochemical stability. The introduction of A-site deficiency into LSCFN results in obviously increased oxygenevacancy concentration and improved electrochemical performance. A single cell with LSCFN10 symmetrical electrode operates well in various fuels, such as H-2, sulfur-containing syngas, ethanol, and CH4, and shows favorable electrochemical stability running on CH4 fuel.

• 出版日期2018-4-20
• 单位长春理工大学; 辽宁石油化工大学; 吉林大学