Wyniki wyszukiwania - BazTech

1

Electrocatalytic sensor based on Nasicon with auxiliary layer

Strzelczyk A., Jasiński G., Jasiński P., Chachulski B.

Elektronika : konstrukcje, technologie, zastosowania

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2012

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Vol. 53, nr 1

72-74

EN

In this study properties of Nasicon solid state gas sensors working in electrocatalytic mode are investigated. The principle of operation of such sensors is based on the excitation with a periodic potential signal, while current response is recorded. The sensors are prepared in ceramic technology with two different constructions. One construction is a symmetrical, sandwich type structure with electrolyte between two identical gold electrodes. In the second, the same structure is used, but the electrodes are covered with auxiliary layer of sodium nitrite. Nitrogen dioxide sensing properties of both sensors are determined and compared.

PL

W pracy zostały przedstawione wyniki pomiarów czujnika na bazie Nasiconu pracującego w trybie elektrokatalitycznym. Czujniki takie pobudzane są zmieniającym się napięciem przy jednoczesnym pomiarze odpowiedzi prądowej. Przygotowano czujniki ceramiczne o dwóch różnych typach. Pierwszy z nich to czujnik posiadający dwie identyczne elektrody złote, pomiędzy którymi znajduje się elektrolit stały. Drugi czujnik posiada złote elektrody dodatkowo pokryte warstwą azotanu (III) sodu. Zmierzono i porównano odpowiedzi obu czujników dla różnych stężeń dwutlenku azotu w mieszaninie z powietrzem.

2

The effect of humidity on the electrical properties of Nasicon-type materials

Ignaszak A., Pasierb P., Komornicki S.

Materials Science Poland

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2006

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Vol. 24, No. 1

95--102

EN

Nasicon Na3Zr2Si2PO12 samples were prepared by coprecipitation and solid-state reaction. Both methods lead to materials consisting of monoclinic Nasicon phases with small admixtures of ZrO2 or ZrSiO4. The differences of their behaviours and stabilities in long-term ageing tests in humid atmospheres are discussed in terms of their microstructures. Model equivalent circuits are proposed to explain observed phenomena.

3

Electrocatalytic gas sensors based on Nasicon and Lisicon

Jasiński G., Jasiński B., Chachulski B., Nowakowski A.

Materials Science Poland

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2006

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Vol. 24, No. 1

261--268

EN

The principle of operation, construction, and properties of gas sensors based on Nasicon and Lisicon are presented. These types of materials are known to exhibit high ionic conductivities and relatively high chemical stabilities at elevated temperatures. Electrocatalytic sensors have been prepared using ceramic technology. Their working principle is based on electric current acquisition, when a voltage ramp is applied to the sensor. The current-voltage plot has a unique shape, depending on the surrounding gas and its concentration. Measurements conducted in mixtures of nitrogen dioxide, sulphur dioxide, and synthetic air are presented.

4

Application of Nasicon and YSZ for the construction of CO2 and SOx potentiometric gas sensors

Pasierb P.

Materials Science Poland

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2006

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Vol. 24, No. 1

279--284

EN

Solid-state potentiometric CO2 and SOx sensors were fabricated using Nasicon (Na3Zr2Si2PO12) or YSZ (ZrO2 + 8 mole % of Y2O3) solid electrolytes, with fused carbonates or sulphates as sensing electrodes and Na2Ti6O13-Na2Ti3O7 two-phase systems or porous platinum as reference electrodes. A comparison of the performance and long-term stability of the prepared sensors was made. More stable behaviour of CO2 sensors was observed for cells prepared from Nasicon while SOx sensors with YSZ used as the solid electrolyte displayed a better performance. The sensing mechanism and long-term stability of the investigated cells was discussed in terms of the possible reactivity of solid electrolytes with the electrode materials and the formation and modification of "ionic-bridges" at the solid electrolyte-electrode interface.