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Fabrication and Performance of Solid Oxide Fuel Cells with La 0.2 Sr 0.7 TiO 3– δ as Anode Support and La 2 NiO 4+ δ as Cathode
Author(s) -
Li S.,
Tu H.,
Yu L.,
Anwar M. T.
Publication year - 2016
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201600158
Subject(s) - cathode , materials science , sintering , anode , solid oxide fuel cell , electrolyte , oxide , electrochemistry , chemical engineering , analytical chemistry (journal) , composite material , electrode , metallurgy , chemistry , engineering , chromatography
A novel fabrication process for solid oxide fuel cells (SOFCs) with La 0.2 Sr 0.7 TiO 3– δ (LST A –) as anode support and La 2 NiO 4+ δ (LNO) as cathode material, which avoids complicated impregnation process, is designed and investigated. The LST A – anode‐supported half cells are reduced at 1,200 °C in hydrogen atmosphere. Subsequently, the LNO cathode is sintered on the YSZ electrolyte at 1,200 °C in nitrogen atmosphere and then annealed in situ at 850 °C in air. The results of XRD analysis and electrical conductivity measurement indicate that the structure and electrochemical characteristics of LNO appear similar before and after the sintering processes of the cathode. By using La 0.6 Sr 0.4 CoO 3– δ (LSC) as current collector, the cell with LNO cathode sintered in nitrogen atmosphere exhibits the power density at 0.7 V of 235 mW cm −2 at 800 °C. The ohmic resistance (R S ) and polarization resistance (R P ) are 0.373 and 0.452 Ω cm 2 , respectively. Compared to that of the cell with the LNO cathode sintered in air, the sintering processes of the cell with the LNO cathode sintered in nitrogen atmosphere can result in better electrochemical performance of the cell mainly due to the decrease in R S . The microstructures of the cells reveal a good adhesion between each layer.