Solid Oxide Fuel Cell Employing a New Class of Solid Electrolytes, La9.33+x(Si6−yAly)O26+1.5x−0.5y

Atsushi MINESHIGE; Takayuki NAKAO; Yoshiki OHNISHI; Masafumi KOBUNE; Tetsuo YAZAWA; Hideki YOSHIOKA

doi:10.5796/electrochemistry.77.146

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Solid Oxide Fuel Cell Employing a New Class of Solid Electrolytes, La_9.33+x(Si_6−yAl_y)O_{26+1.5x−0.5y}

Atsushi MINESHIGE, Takayuki NAKAO, Yoshiki OHNISHI, Masafumi KOBUNE, Tetsuo YAZAWA, Hideki YOSHIOKA

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Keywords: Intermediate-temperature Fuel Cell, Lanthanum Silicate, Solid Electrolyte

JOURNAL FREE ACCESS

2009 Volume 77 Issue 2 Pages 146-148

DOI https://doi.org/10.5796/electrochemistry.77.146

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Abstract

Dense and high oxide ion conducting solid electrolytes, Al-doped lanthanum silicate [La_9.33+x(Si_6−yAl_y)O_{26+1.5x−0.5y}] were fabricated and their electrical conducting properties were studied. Among the specimens tested, the electrical conductivity of the slight Al-doped one (x=0.67, y=0.2) was the highest though that was the weighed composition. Its conductivity was almost P(O₂)-independent, while a slight increase in conductivity with increasing P(O₂) was observed in the high temperature region. The current-voltage characteristic of a fuel cell utilizing the novel electrolytes was also investigated employing platinum electrodes as both anode and cathode.

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