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Planar Impedancemetric NO Sensor with Thick Film Perovskite Electrodes Based on Samarium Cobaltite
Author(s) -
Cvejin Katarina,
Manjakkal Libu,
Kulawik Jan,
Zaraska Krzysztof,
Szwagierczak Dorota
Publication year - 2015
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201400602
Subject(s) - materials science , cobaltite , electrode , samarium , perovskite (structure) , electrolyte , nyquist plot , analytical chemistry (journal) , electrical impedance , yttria stabilized zirconia , cubic zirconia , composite material , optoelectronics , dielectric spectroscopy , ceramic , chemical engineering , metallurgy , inorganic chemistry , chemistry , electrochemistry , electrical engineering , chromatography , engineering
Impedancemetric NO sensors were fabricated, comprising yttria stabilized zirconia disc with thick film Sm 0.9 Sr 0.1 CoO 3−δ electrodes of different design. Impedance measurements were performed at 600–800 °C for frequencies 0.01 Hz–100 kHz, in gas mixtures with 0–400 ppm of NO. The smaller arc on Nyquist plots can be associated with solid electrolyte‐electrode interfacial phenomena, while the bigger one to the perovskite electrode reactions. As NO concentration increases, the bigger arc decreases and its maximum shifts toward higher frequencies. Both the sensitivity and the applicable NO concentration range were found to be dependent on the sensor design, temperature and chosen frequency.