Performance comparison of Ni Ex-soluted and impregnated La- and Y- doped Sr titanates as anode for solid oxide fuel cell
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Nickel is doped successfully at the B-site of La0.3Y0.1Sr0.4TiO3−δ (LYSTA−) perovskite to yield La0.3Y0.1Sr0.4Ni0.04Ti0.96O3−δ (LYSNTA−) for its use as an anode for solid oxide fuel cell (SOFC). Ex-soluted nickel particles from LYSNTA− formed upon reduction in hydrogen show average particle size of 6 nm. Electrochemical studies are performed on bilayers of LYSTA−/YSZ and LYSNTA−/YSZ using electrochemical impedance spectroscopy (EIS) and their SOFC performance is compared with 4 wt% NiO-LYSTA−/YSZ bilayer prepared by impregnation route. The activation energy (EA) for overall electrode polarization (Rp) shows the following trend: LYSTA− (≈ 1.4 eV) > LYSNTA− (1.1 eV) ≥ 4 wt% NiO-LYSTA− (≈ 1.0 eV) in temperature range of 650–800 °C for H2 oxidation. SOFC performance of full cell containing LYSNTA− anode is better compared to 4 wt% NiO-LYSTA− anode during reversible testing from methane to hydrogen environment. Impregnation of 6 wt% CeO2 over LYSNTA− anode in the full cell of SOFC gives a better performance than that without CeO2.
KeywordsEx-solution Perovskite Activation energy Impedance Anode/electrolyte bilayer
This study is with the financial support provided by the Defense Research and Development Organization (DRDO), India for carrying out the research activities.
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