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Formation of an indicator layer sensitive to dissolved CO 2 on a molybdenum electrode was studied, as influenced by the solution composition, by potentiometry and voltammetry with continuous voltage variation. Kinetic dependences of the potentiometric response and stationary potential of prototype carbon dioxide sensors based on these electrodes were analyzed.

Studies of single crystals of nonstoichiometric fluorides of PrF 3 :Sr 2+ and NdF 3 :Ba 2+ in contact with a Pt electrode were carried out using the method of voltammetry with a linear potential sweep, chrono amperometry, and cyclic voltammetry. The reaction of gaseous oxygen reduction (GOR) at the PrF 3 :Sr 2+ /Pt interface was accompanied by appearance of mobile oxygen forms. The catalytic activity of PrF 3 :Sr 2+ with respect to gaseous oxygen, same as CeF 3 :Sr 2+ , can be explained by variable valency of praseodymium and cerium fluoride, which creates opportunities for using them in oxygen and oxygen-containing gas sensors. The GOR reaction at the NdF 3 :Ba 2+ /Pt interface appeared as a result of anodic polarization. After charging at E = 3.2 V, the NdF 3 :Ba 2+ single crystal was successfully used for fluorination of Sb and Ag. NdF 3 :Ba 2+ is most promising in devices based on reactions with participation of mobile fluoride ion in solid electrolytes, particularly, for generation of gaseous fluorine.

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