Oxygen sensor based on the principle of electrochemical pump

Rui Xian Luo, En Hui Liu, Feng Cai Ren, Ai Fan Chen, Liu Chung-chiun

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A high-temperature oxygen sensor of limiting current with a porous layer on the cathode to limit the diffusion rate of oxygen is investigated and fabricated. The solid electrolyte is made of Yttria-doped stabilized zirconia (YSZ) and the porous platinum film electrode is deposited on the surface of YSZ. The relation between temperature and oxygen concentration is tested at 629 °-780 °C in a mixture of N2 and O2 with the oxygen concentration being 0-37%. Experimental results show a linear output with the oxygen concentration. The temperature-dependence of its output can be explained by taking into account a mixed diffusion control mechanism of the ordinary and Knudsen diffusion. The operating principle, structure and performance of the sensor are discussed.

Original languageEnglish
Pages (from-to)379-384
Number of pages6
JournalScience in China (Scientia Sinica) Series A
Volume37
Issue number3
StatePublished - Mar 1994

Keywords

  • diffusion control
  • limiting current
  • oxygen sensor

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