Impact of Infraslow Corrosion on the Duration of Transient Processes in Amperometric Gas Sensors
DOI:
https://doi.org/10.20535/1810-0546.2015.3.63801Keywords:
Amperometric sensors, Duration of transient’s processes, Corrosion of the electrodes, Nanostructured oxidesAbstract
Background. The duration of transient processes is an important characteristic of amperometric gas sensors.
Objective. The objective of the study is a determination of nature of the transition processes that increase the time required to establish a reliable signal amperometric sensor and the variation of the time.
Methods. The chronoamperometry techniques for transient processes and determination of their temperature coefficient shows the effect of corrosion on the sensors of standardised series of NTUU “KPI”.
Results. The minimum duration of the transient state is responsible of oxide layers, which is achieved by cyclic current load of the working electrode, including “training” of the electrode with the current on level of infraslow corrosion (slower as 1 micron/year). It is observed periodic variation of the properties of these oxide layers by the infraslow corrosion, which fades with flow of time and without external influence. The interference of these cycles with periodic changes in the external environment may accidentally cause an unexpected slowdown in the current-producing process.
Conclusions. Cyclic current loads form on the working electrode of amperometric sensor some oxide structures with size up to 10 nm, similar to the so-called nanotehnologіes method of the “bottom-up” type. Without such current loads surface oxide layers are sealed, and their resistance increases and inhibits the current-forming process. The direct detection of such structures by electron microscopy requires prior theoretical justification of the research methodology.
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