Elektrochemiczny sensor amoniaku

• Autorzy: Błach A. , Pasierb P. , Rękas M.

Warianty tytułu

EN

An ammonia gas sensor

• Języki publikacji: PL

Abstrakty

PL

Przedmiotem badań był elektrochemiczny sensor amoniaku, w którym użyto Ba(Ce1-xTizYx-z)O3 jako elektrolitu stałego. Przeprowadzone badania analizy termicznej oraz dyfrakcji rentgenowskiej pozwoliły na określenie optymalnej metody preparatyki oraz warunki spiekania elektrolitu. Mikrostrukturę elektrolitu wyznaczono stosując mikroskopię elektronową. Skonstruowany sensor amoniaku stanowi ogniwo stałe, w którym elektrodami są warstwy porowatej platyny. Pomiary charakterystyk sensorowych posłużyły do wyznaczenia podstawowych parametrów sensora oraz określenia mechanizmu jego działania.

EN

An ammonia gas sensor was constructed with the high temperature proton conducting barium cerate doped with titanium and yttrium, Ba(Ce0.95Ti0.05)0.90Y0.1O3, as a solid electrolyte. It was prepared by solid state reaction. Preparation conditions were determined by means of the differential thermal analysis (DTA), thermogravimetry (TG) as well as mass spectrometry (MS). Chemical and phase composition and microstructure were determined using X-ray diffraction (XRD) and scanning electron microscopy (SEM). According to the XRD analysis, the product was homogenous and crystallized in orthorhombic Pmcn structure. Scanning electron microscopy (SEM) revealed that it is composed from uniform grains of the 0.5 – 1.5 m dimension. The sensor manufacture consisted of several steps. Firstly, the powder of Ba(Ce0.95Ti0.05)0.90Y0.1O3 was pressed in pellet die (100 MPa) and calcined at 1200oC for 24 hrs. The obtained materials were crushed, milled, formed in pellet die and isostatically pressed at 250 MPa and sintered at 1500oC for 24 hrs in air atmosphere. Then, both sides of polished pellet were covered with Pt paste ( provided by Demetron), dried at 100oC for 1 h and fired at 850oC for 2 hrs, after cooling down the pellet was attached to Al2O3 tube using the ceramic binder (Cerambond 885/516) to allow the separation of both electrode compartments during the sensor operation. The device was dried and heated at 370oC. The electromotive force (EMF) of the constructed cell was measured as a function of temperature (400- 700oC), NH3 concentration in argon (0-1000 ppm) at sensing electrode and time. Air, or Ar+5% H2 gas atmospheres were used at reference electrode. The best sensor performance was observed in case of air. Studies of sensor mechanism revealed the mixed potential behavior.

Słowa kluczowe

PL

ogniwa stałe; sensor amoniaku; elektrolit protonowy; mikroskopia elektronowa

EN

solid cells; ammonia gas sensor; proton electrolyte; electron microscopy

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Przegląd Elektrotechniczny
• Rocznik: 2010
• Tom: R. 86, nr 10
• Strony: 1--4
• Opis fizyczny: Bibliogr. 18 poz., rys., wykr.

Twórcy

autor

Błach A.

autor

Pasierb P.

autor

Rękas M.

• Akademia Górniczo-Hutnicza im. S. Staszica, Wydział Inżynierii Materiałowej i Ceramiki,

Bibliografia

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