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YSZ-based sensor using Cr-Fe-based spinel-oxide electrodes for selective detection of CO.

Sri Ayu Anggraini1, Yuki Fujio1, Hiroshi Ikeda2

  • 1Advanced Manufacturing Research Institute (AMRI), National Institute of Advanced Industrial Science and Technology (AIST), Tosu, Saga, 841-0052, Japan.

Analytica Chimica Acta
|July 24, 2017
PubMed
Summary

A new yttria-stabilized zirconia (YSZ)-based sensor selectively detects carbon monoxide (CO) using combined copper and cobalt ferrite electrodes. This stable sensor operates effectively under humid conditions, offering a reliable method for CO detection.

Keywords:
CoCrFeO(4)CuCrFeO(4)Gas sensorMixed potentialYSZ

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Sensing

Background:

  • Development of selective gas sensors is crucial for environmental monitoring and industrial safety.
  • Mixed-metal oxides offer promising properties for sensing applications.
  • Yttria-stabilized zirconia (YSZ) is a well-established solid electrolyte for electrochemical sensors.

Purpose of the Study:

  • To develop a selective carbon monoxide (CO) sensor using dual sensing electrodes.
  • To investigate the sensing characteristics and mechanism of the developed sensor.
  • To evaluate the sensor's performance under various conditions, including humidity and long-term stability.

Main Methods:

  • Fabrication of YSZ-based potentiometric sensors with CuCrFeO4 and CoCrFeO4 sensing electrodes (SEs).
  • Testing individual SEs for gas sensitivity (CO, hydrocarbons, NOx).
  • Evaluating the combined SEs sensor's selectivity, detection range, response mechanism (polarization curves), humidity effect, and long-term stability.

Main Results:

  • CuCrFeO4-SE detected CO, hydrocarbons, and NOx; CoCrFeO4-SE detected hydrocarbons and NOx.
  • The combined SEs sensor exhibited selective CO detection at 450°C under humid conditions.
  • The sensor detected CO in the 20-700 ppm range with a mechanism based on the mixed-potential model.
  • CO response was stable across a wide range of water vapor concentrations (1.3-11.5 vol% H2O) and over 13 days.

Conclusions:

  • A selective CO sensor was successfully developed using a combination of CuCrFeO4 and CoCrFeO4 as SEs on a YSZ substrate.
  • The sensor demonstrates robust performance, high selectivity to CO, and stability under humid conditions, making it suitable for practical applications.
  • The mixed-potential mechanism governs the sensor's CO detection capability.