PRODUCTION OF BISMUTH BASED NEW TYPE ELECTROLYTES AND ITS APPLICATION IN SOLID OXIDE FUEL CELLS

Yıl 2018, , 350 - 369, 31.01.2018

Serdar Yılmaz

https://doi.org/10.28948/ngumuh.387125

Öz

   Bismuth-based
solid electrolytes are used as a solid electrolyte especially in oxygen pumps,
oxygen gas detectors and fuel cells. In terms of conductivity, Bi-based
electro-ceramics are an alternative material according to Ceria-based and
Zirconia-based ones. In this study, all the processes for the synthesis of new
type stabilized Bi-based doped solid electrolyte powders, shaping in thick film
form and the application of single fuel cell for observation of electrical
power production have been particularly explained. For this purpose, new type
Bismuth-based solid electrolyte powders were synthesized by adding lanthanide
group (Gd₂O₃) and (Dy₂O₃) oxide
compounds in (Bi₂O₃) at different ratios. Subsequently,
physical properties were investigated by forming a thin layer via tape casting
method. Microstructures of the fabricated materials were investigated by SEM,
temperature and time dependent conductivity characterization was performed by
impedance analysis, Activation Energies and load carrier numbers were measured.
Then, single fuel cell application of the produced solid electrolyte was done.
For this, both surfaces of the electrolyte were coated with electrodes by
screen printing method and the power production was tested. Processes of
production conditions were investigated and all of the determined parameters
were explained.

Anahtar Kelimeler

Solid oxide fuel cell, bismuth oxide, tape casting, screen printing, electrical conductivity characterization

KATI OKSİT YAKIT HÜCRELERİNDE KULLANILMAK ÜZERE ŞERİT DÖKÜM YÖNTEMİYLE BİZMUT TABANLI YENİ TİP ELEKTROLİTLERİN ÜRETİLMESİ VE YAKIT HÜCRE UYGULAMASI

Öz

   Bizmut-temelli katı elektrolitler
özellikle oksijen pompaları, oksijen gaz dedektörleri ve yakıt pillerinde katı
elektrolit olarak kullanılmaktadır. Bu tür elektroseramikler, üretilmekte olan
Seria-temelli ve Zirkonya-temelli olanlara iletkenlik özellikleri bakımından güçlü
bir alternatif malzemedir. Bu çalışmada, kolay üretilebilen yeni tip Bizmut-tabanlı
katkılanmış katı elektrolit tozların sentezlenmesine, ince tabaka formunda şekillendirilmesine
ve elektriksel güç üretiminin gözlenmesi için tekli yakıt hücre uygulamasının
yapılmasına dair tüm süreçler ayrıntılı şekilde açıklandı. Bu amaçla Lantanit
grubunun (Gd₂O₃) ve (Dy₂O₃) oksit
bileşikleri (Bi₂O₃) içerisine farklı oranlarda katkılanarak
yeni tip Bizmut-temelli katı elektrolit tozlar üretildi, ardından şerit döküm
yöntemi ile ince tabaka formuna getirilerek fiziksel özellikleri araştırıldı. Üretilen
malzemelerin SEM ile mikroyapıları incelendi, empedans analizi ile sıcaklığa ve
zamana bağlı iletkenlik karakterizasyonları yapıldı, aktivasyon enerjileri ve
yük taşıyıcı sayıları ölçüldü. Ardından üretilen katı elektrolitin tekli yakıt
hücresi uygulaması yapıldı. Bunun için ekran baskı yöntemi ile elektrolitin her
iki yüzeyi elektrotlar ile kaplanıp güç üretimi test edildi. Tüm üretim
şartlarına ait süreçler ayrıntılı şekilde araştırılarak üretim şartlarına ait
tespit edilen parametreler açıklandı.

Anahtar Kelimeler

Katı oksit yakıt hücresi, bizmut oksit, şerit döküm, ekran baskı, elektrik iletkenliği karakterizasyonu

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