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A novel method for preparing dense diffusion barrier limiting current oxygen sensor
Author(s) -
Liu Tao,
Jin Hongbin,
Li Lin,
Yu Jingkun
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15302
Subject(s) - limiting current , conductivity , electrolyte , analytical chemistry (journal) , gallate , materials science , diffusion , oxygen sensor , electrical resistivity and conductivity , perovskite (structure) , lanthanum , thin film , oxygen , chemistry , electrode , inorganic chemistry , nanotechnology , electrochemistry , nuclear chemistry , crystallography , chromatography , physics , organic chemistry , electrical engineering , engineering , thermodynamics
A novel method for preparation of a dense diffusion barrier limiting current oxygen sensor is presented. The dense thin‐layer with the nominal composition Sr‐, Mg‐ and Fe‐doped lanthanum gallate ( LSGMF ) was prepared over La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3–δ ( LSGM ) electrolyte by a thermal diffusion method. The crystal structure, morphology, elemental distribution, conductivity, and sensing performance of the prepared sample were investigated. X‐ray diffraction ( XRD ) analysis shows a highly crystalline perovskite. SEM ‐ EDS analysis shows that the dense thin‐layer with about 40 μm thickness is well attached to the solid electrolyte. Electrical conductivity measurement shows that the dense thin‐layer has high conductivity of 8.73 S·cm −1 at 800°C. The oxygen sensor exhibits good sensing performance. The variations of the limiting current ( I L ) vs oxygen content ( x (O 2 )) can be obtained as follows:I L ( mA ) = 96.65 x ( O ) 2 ( mol ) % + 28.62