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Improvement of Oxygen Electrode Performance of Intermediate Temperature Solid Oxide Cells by Spray Pyrolysis Deposited Active Layers
Author(s) -
Kamecki Bartosz,
Karczewski Jakub,
Jasiński Piotr,
Molin Sebastian
Publication year - 2021
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202002227
Subject(s) - materials science , electrode , electrolyte , oxide , dielectric spectroscopy , analytical chemistry (journal) , anode , nanocrystalline material , polarization (electrochemistry) , chemical engineering , oxygen , solid oxide fuel cell , electrochemistry , nanotechnology , metallurgy , chemistry , chromatography , engineering , organic chemistry
Intermediate temperature solid oxide fuel cells oxygen electrodes are modified by active interfacial layers. Spray pyrolysis is used to produce thin (≈500 nm) layers of mixed ionic and electronic conductors: Sm 0.5 Sr 0.5 CoO 3− δ (SSC), La 0.6 Sr 0.4 CoO 3− δ (LSC), La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3− δ (LSCF), and Pr 6 O 11 (PrO x ) on the electrode–electrolyte interface. The influence of the annealing temperature on the electrode polarization (area specific resistance—ASR pol ) is investigated by impedance spectroscopy of symmetrical electrodes in the temperature range of 400–700 °C. The results show that the introduction of nanocrystalline interlayers promotes an oxygen reduction reaction by extending the active surface area and improved contact between the electrode and the electrolyte. Introducing LSCF, LSC, or SSC interlayer reduces ASR pol by a factor of 4 and PrO x by a factor of 2 against the reference, powder processed LSCF electrode. At 600 °C, the obtained ASR pol values for PrO x , LSCF, LSC, and SSC interlayer are 245, 137, 119, and 107 mΩ cm 2 , which can be considered very low in comparison to standard powder processed oxygen electrodes. Anode supported single cell with developed LSC/LSCF electrode reveals ≈1.2 W cm −2 power output at 600 °C and maintains stable cell voltage of 0.75 V under 1 A cm −2 during 60 h of the test.