Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 152, Issue 2, Pages 261-266Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2010.12.018
Keywords
Oxygen sensor; Solid reference electrode; YSZ; Mn(2)O(3)
Funding
- Kyushu University
- MEXT, Japan [22350095]
- Grants-in-Aid for Scientific Research [22350095] Funding Source: KAKEN
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Various Mn-based oxides have been screened to find a suitable all-solid-state gas-insensitive reference-electrode (RE) for yttria-stabilized zirconia (YSZ)-based potentiometric oxygen sensor. The experimental observation of tubular YSZ-based sensors attached with each of the outer Mn-based oxide sensing electrodes (SEs) and the inner Pt-RE revealed that Mn(2)O(3)-SE was insensitive to all gases including oxygen at operating temperatures below 550 degrees C. Thus, the planar-like rod-type YSZ-based sensor using Pt-SE, Au-SE and Mn(2)O(3)-RE was then fabricated and its sensing performances were evaluated at 550 C. As a result, the planar sensor using a couple of Pt-SE and Mn(2)O(3)-RE exhibited excellent responses to oxygen in the concentration range of 0.05-21 vol.% obeying Nernst equation and gave negligible responses to other co-existing gases. Close similarity of the results for tubular and planar sensors operated in a wide range of air/fuel (A/F) ratio indicated that the tubular YSZ-based sensor using the inner Pt-RE could be successfully miniaturized to the planar one using Mn(2)O(3)-RE without sacrificing its performance. (C) 2010 Elsevier B.V. All rights reserved.
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