Limiting current and wide range air/fuel ratio sensors using the same ysz-al2o3 layers as electrolyte and diffusion barrier

Jong Heun Lee, Chang Soon Kwon, Hoin Kim, Byung Ki Kim

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

A limiting current-type oxygen sensor using the same YSZ-Al2O3 layers as electrolyte and diffusion barrier was designed to increase thermal shock resistance, ease of fabrication, and long-term stability of the sensor. The limiting current of the sensor originated from the limited O2 diffusion towards the cathode side from all directions of the sensor because the microstructures of the electrolyte and diffusion barrier are the same. The limiting current could be manipulated successfully by varying Al2O3 contents and sintering temperatures, which resulted from the microstructural change of the YSZ-Al2O3 layers. A new wide range air/fuel ratio (A/F) sensor was also suggested by placing an additional O2 pumping cell under the present limiting current-type sensor. The sensing signal increased linearly with O2 in O2-CO2-N2 and decreased with CO in CO-CO2-N2. Thus the wide range of A/F can be measured with this simple sensor structure and operating algorithm.

Original languageEnglish
Pages (from-to)278-284
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume36
Issue number1-3
DOIs
Publication statusPublished - 1996 Oct
Externally publishedYes

Keywords

  • Diffusion barrier
  • Limiting current-type sensor
  • Oxygen pumping
  • Wide range air/fuel ratio sensor
  • Yttria stabilized zirconia

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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