ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The sensing characteristics of a solid-state electrochemical CO2 gas sensor, expressed as Pt∥O2, Na2O ∥ Na ionic conductor ∥ Na2CO3∥CO2, O2∥Pt were investigated in terms of a two-electron electrochemical reaction. The number of electrons for the cell reaction was higher than 2 and approached 2 with an increase in the operating temperature up to about 500 °C. The introduction of water vapour induced a lowering of the e.m.f. and a prolongation of the response time. The formation of sodium oxides in the Na2CO3 layer was considered as a possible cause of these water effects. The sensing characteristics recovered completely after the water vapour was cutoff. The e.m.f. reduction due to water sorption was depressed by using a densified Na3Zr2Si2PO12. A densified Na3Zr2Si2PO12-based electrolyte is preferable for use as a gas sensor with a fast response and high stability for detection of CO2 in air.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00365182
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