Low-temperature zirconia oxygen gauges based on RuO2 electrode

Periaswami, G. ; Vana Varamban, S. ; Rajan Babu, S. ; Mathews, C. K. (1988) Low-temperature zirconia oxygen gauges based on RuO2 electrode Solid State Ionics, 26 (4). pp. 311-317. ISSN 0167-2738

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/016727...

Related URL: http://dx.doi.org/10.1016/0167-2738(88)90261-5


A low temperature oxygen gauge based on zirconia electrolyte has been developed. It makes use of RuO2 as electrode material in place of platinum in conventional gauges. The low interfacial impedance of the RuO2 electrode makes it possible to keep the cell resistance below 106 ω even at low temperatures. Nernst's law tests indicate that this cell can give theoretical outputs down to 498 K campared to 923 K for gauges with platinum electrodes. Faraday's law tests confirm its good performance over a wide range of oxygen concentrations. High electronic conductivity, single oxide phase, slight non-stoichiometry and good adherence are responsible for the good performance of RuO2 as electrode. An activation energy of 90.95 kJ/mole observed for the interface shows that the vacancy movement in the electrolyte is the rate controlling step. The evaporation of RuO2 as RuO4 gives rise to flow dependent output. This can be overcame by operating the cells at low temperatures though at the cost of speedy response. The low operating tempratures lead to a compact gauge with good stability.

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