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Wyniki 1-2 spośród 2 dla zapytania: authorDesc:"ANNA STRZELCZYK"

» Electrocatalytic gas sensor with non-triangular excitation

GRZEGORZ JASIŃSKI

ANNA STRZELCZYK

BOGDAN CHACHULSKI

PIOTR JASIŃSKI

In recent years, solid state ion conducting materials have been intensively developed. These materials have a relatively high ionic conductivity based on a single predominantly conducting anion or cation species and have negligibly small electronic conductivity. Typically, useful solid electrolytes exhibit ionic conductivities from 10-1 to 10-5 S/cm at room temperature. Solid state electrolytes exhibit a potential for application in a variety of solid state electrochemical devices such as fuel cells, batteries, membranes, pumps and sensors [1]. Gas sensors are one of the most critical and rapidly growing areas in modern solid electrolyte technology. Solid state gas sensors are cost effective, small, rugged and reliable [2, 3]. Usually electrochemical solid state sensors operate in either potentiometric or amperometric mode [4, 5]. A lack of selectivity is sometimes a shortcoming of such sensors. It seems that improvements of selectivity can be obtained in case of the electrocatalytic sensors. Their working principle is based on acquisition of an electric current, while voltage ramp is applied to the sensor. The current-voltage response depends in a unique way on the type and concentration of ambient gas. In case of electrocatalytic gas sensors usually a linearly changing voltage excitation signal of symmetrical triangular shape in range from 5 to -5 V is applied to the sensors terminals [6]. The voltage sweep rate is adjusted to 50 mV/s. This, originated from liquid electrochemistry, method has some shortcomings. In typical conditions, one measuring cycle takes up to 7 min. Stable response is obtained most often after 2 or more cycles, thus extending measuring time even further. Long measuring time can limit application of electrocatalytic sensors in environments with fast gas concentration changes. In th[...] więcej»
w zeszycie ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA 2011/3

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» Electrocatalytic sensor based on Nasicon with auxiliary layer

Anna Strzelczyk

Grzegorz Jasiński

Piotr Jasiński

Bogdan Chachulski

In recent years electrochemical gas sensors based on solid state electrolytes have been intensively investigated. They are relatively easy to fabricate, simple in use and quite durable. Nasicon (Na Super Ionic Conductor) is one of the most promising materials, which have been used in construction of gas sensors. Sensors based on Nasicon are used for detecting of different gases including carbon oxides [1, 2], nitrogen oxides [3-6] and sulfur dioxide [7]. Most of these devices operate in potentiometric or amperometric mode. In case of some sensor constructions, besides electrolyte and metal electrodes, additional layers are applied. In some cases such phase is required to obtain sensitivity to specific gas or to shift operating temperature to more preferred one [7]. In other cases sensor properties such as selectivity or stability are improved. Auxiliary phase usually forms extra interface between measured gaseous compound and electrolyte or electrodes. For example, in case of amperometric sensors, it was noticed, that presence of auxiliary layer on surface of sensing electrode can increase the number of reaction sites thus improving sensor sensitivity [5]. Auxiliary layer may also be used to create a diffusion barrier. In case of the potentiometric or amperometric nitrogen oxides sensors based[...] więcej»
w zeszycie ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA 2012/1

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