Comparative studies of the electrochemical behaviour of Me|Ba0.95Ca0.05Ce0.9Y0.1O3, Me|Ce0.8Gd0.2O1.9, and Me|Zr0.84Y0.16O1.9 systems caused by long-term cathode polarisation, where Me = Ag, Au quasi-point electrodes

• Autorzy: Dudek M. , Lis B. , Raźniak A. , Zych Ł. , Rapacz-Kmita A. , Gajek M. , Socha R. P. , Mosiałek M. , Reben M.

Identyfikatory

DOI

10.15199/28.2017.2.1

Warianty tytułu

PL

Analiza zmian zachodzących pod wpływem długotrwałej polaryzacji katodowej na granicy faz Me|Ba0.95Ca0.05Ce0.9Y0.1O3, Me|Ce0.8Gd0.2O1.9 i Me|Zr0.84Y0.16O1.9, gdzie Me = pseudo-punktowa elektroda wykonana z Ag, Au

• Języki publikacji: EN

Abstrakty

EN

Electrochemical measurements were performed with applied potential of –0.05 to ‒0.7 V at 700°C. An increase in absolute current was observed in chronoamperometric curves during long-term negative polarisation from ‒0.3 to ‒0.7 V for an Ag quasi-point electrode in Ag|E, E = Ba0.95Ca0.05Ce0.9Y0.1O3; Ce0.8Gd0.2O1.9, or Zr0.84Y0.16O1.9 systems. Decreases in ohmic resistance Rs and polarisation resistance Rp for Ag|Ba0.95Ca0.05Ce0.9Y0.1O3, Ce0.8Gd0.2O1.9, and Zr0.84Y0.16O1.9 systems were determined by means of electrochemical impedance spectroscopy in analogous conditions. Confocal or scanning electron microscopy observation confirmed the migration of silver particles onto ceramic electrolytes under long-term negative polarisation. A silver deposit was found near the site of direct contact of the Ag electrode with the surface of the Ba0.95Ca0.05Ce0.9Y0.1O3 electrolyte. An expansion of the reaction zone in the Ag|Ba0.95Ca0.05Ce0.9Y0.1O3 system is the main reason for the increase in absolute current values. A similar electrochemical response was found in the case of zirconia or ceria-based solid electrolytes with Ag quasi-point electrodes. The effect of the chemical composition and physicochemical properties of ceramic electrolytes and applied negative potential on electrochemical response in Au|Ba0.95Ca0.05Ce0.9Y0.1O3, Au|Ce0.8Gd0.2O1.9, and Au|Zr0.84Y0.16O1.9 systems was recorded. In the case of Au|Ba0.95Ca0.05Ce0.9Y0.1O3 system, during negative polarisation with an applied potential in the range from ‒0.05 to ‒0.3 V, a small increase in absolute current values was observed on the chronoamperometric curves. In the case of Au|Ba0.95Ca0.05Ce0.9Y0.1O3 system, decreases in ohmic resistance Rs and polarisation resistance Rp were noticed vs applied potential.

PL

Celem pracy była analiza możliwych zmian zachodzących pod wpływem długotrwałej polaryzacji katodowej na granicy faz Me|Ba0,95Ca0,05Ce0,9Y0,1O3, Me|Ce0,8Gd0,2O1,9, i Me|Zr0,84Y0,16O1,9, Me = Ag, Au.

Słowa kluczowe

EN

ceramic proton ion conductor; BaCe0.9Y0.1O3; point-electrode; intermediate temperature solid oxide electrolyte; oxygen reduction process

PL

przewodnik protonowy ceramiczny; BaCe0.9Y0.1O3; elektroda punktowa; elektrolity tlenkowe; obniżony zakres temperatury; proces redukcji tlenu

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2017
• Tom: Vol. 38, nr 2
• Strony: 58--68
• Opis fizyczny: Bibliogr. 34 poz., fig., tab.

Twórcy

autor

Dudek M.

• AGH University of Science and Technology, Faculty of Energy and Fuels, Cracow

autor

Lis B.

• AGH University of Science and Technology, Faculty of Energy and Fuels, Cracow

autor

Raźniak A.

• AGH University of Science and Technology, Faculty of Energy and Fuels, Cracow

autor

Zych Ł.

• AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Cracow

autor

Rapacz-Kmita A.

• AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Cracow

autor

Gajek M.

• AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Cracow

autor

Socha R. P.

• Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Cracow

autor

Mosiałek M.

• Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Cracow

autor

Reben M.

• AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Cracow

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).