Nasicon-Based Planar-Type CO2 Sensor Attached with Solid Reference Electrode Stable Under High Humid Conditions

Author

Kida, T. ; Kishi, S. ; Yuasa, M. ; Shimanoe, K. ; Yamazoe, N.

Author_Institution

Kyushu Univ., Fukuoka

fYear

2007

fDate

10-14 June 2007

Firstpage

975

Lastpage

978

Abstract

In order to improve the stability of a NASICON (Na₃Zr₂Si₂PO₁₂; Na⁺ conductor)-based potentiometric CO₂ sensor under humid conditions, a new solid-reference electrode of the BiCuVOx (Bi₂Cu_0.1V_0.9O_5.35)/perovskite-type oxide (La_0.6Sr_0.4Co_0.78Ni_0.02Fe_0.2O₃) composite was investigated. The fabricated electrochemical cell (CO₂+O₂, Au/Li₂CO₃-BaCO₃/ NASICON/ BiCuVOx-La_0.6Sr_0.4Co_0.78Ni_0.02Fe_0.2O₃, O₂) responded well to changes in CO₂ concentration (100-400 ppm) at 400-450degC under high humid conditions (86% RH) without degradation. The sensor device also exhibited a good warming-up characteristic, i.e., the electromotive force of the device quickly reached a steady and constant value when the sensor operation is re-started even after the sensor was exposed to high humid air at room temperature.

Keywords

electrochemical sensors; gas sensors; microsensors; electrochemical cell; electromotive force; nasicon-based planar-type sensor; solid reference electrode; temperature 400 C to 450 C; Bismuth; Electrodes; Gas detectors; Iron; Sensor phenomena and characterization; Solids; Stability; Strontium; Temperature sensors; Zirconium; CO2 sensor; NASICON; solid electrolyte; stability; warming-up characteristic;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State Sensors, Actuators and Microsystems Conference, 2007. TRANSDUCERS 2007. International

Conference_Location

Lyon

Print_ISBN

1-4244-0842-3

Electronic_ISBN

1-4244-0842-3

Type

conf

DOI

10.1109/SENSOR.2007.4300295

Filename

4300295