Comparative studies of the electrochemical behaviour of $Me|Ba_{0.95}Ca_{0.05}Ce_{0.9}Y_{0.1}O_{3}$, $Me|Ce_{0.8}Gd_{0.2}O_{1.9}$, and $Me|Zr_{0.84}Y_{0.16}O_{1.9}$ systems caused by long-term cathode polarisation, where Me = Ag, Au quasi-point electrodes
PBN-AR
Instytucja
Wydział Inżynierii Materiałowej i Ceramiki (Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie)
Informacje podstawowe
Główny język publikacji
EN
Czasopismo
IM Inżynieria Materiałowa (13pkt w roku publikacji)
ISSN
0208-6247
EISSN
Wydawca
Wydawnictwo SIGMA-NOT Sp. z o.o.
DOI
Rok publikacji
2017
Numer zeszytu
2
Strony od-do
58--68
Numer tomu
38
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
0.78
Autorzy
Pozostali autorzy
+ 5
Słowa kluczowe
EN
oxygen reduction process
intermediate temperature solid oxide electrolyte
point-electrode
BaCe0.9Y0.1O3
ceramic proton ion conductor
PL
ceramiczny przewodnik protonowy
BaCe0.9Y0.1O3
elektroda punktowa
elektrolit tlenkowy pracujący w obniżonym zakresie temperatury
proces redukcji tlenu
Streszczenia
Język
EN
Treść
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.
Cechy publikacji
original article
peer-reviewed
Inne
System-identifier
idp:105588
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