Amperometric Nitrite-Ion Sensor Based on Electrodeposited Sm-Based Perovskite-Type Oxide Thick-Film Electrode

作者：Yatsunami Takahiro; Takase Satoko; Shimizu Youichi^*

来源：Sensors and Materials, 2016, 28(7): 777-784.

DOI：10.18494/sam.2016.1256

• perovskite-type oxide
• nitrite-ion sensor
• carbon-felt electrodes
• amperometric
• electrophoretic deposition

Perovskite-type oxide SmBO3 (B = Cr, Mn, Fe, Co) powders were prepared by a polymer precursor method at 750 degrees C and systematically investigated for electrochemical sensing properties for NO2-. The SmBO3-modified carbon-felt electrodes could be prepared by an electrophoretic deposition (EPD) method without sintering. Among the oxide deposited electrodes, the SmFeO3 modified electrode showed the highest sensitivity to NO2- with 11.9 mA M-1 cm(-2) and a linear sensing range between 5.0 x 10(-5) and 1.0 x 10(-3) M at +0.85 V vs Ag / AgC1 with high selectivity for NO2- and no response to most other anions. A good correlation was observed between electrochemical activity toward nitrite-ion oxidation and oxygen adsorption properties of the oxides.

• 出版日期2016