Synthesis and characterization of (Bi2O3)(1-x-y-z)(Gd2O3)(x)(Sm2O3)(y)(Eu2O3)(z) quaternary solid solutions for solid oxide fuel cell

ARI M., BALCI M., Polat Y.

CHINESE JOURNAL OF PHYSICS, cilt.56, sa.6, ss.2958-2966, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 56 Sayı: 6
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.cjph.2018.10.001
  • Dergi Adı: CHINESE JOURNAL OF PHYSICS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.2958-2966
  • Anahtar Kelimeler: Solid oxide fuel cell (SOFC), Quaternary solid solutions, Solid-state reaction, Electrical conductivity, Activation energy, SINTERED OXIDES, ELECTRICAL-CONDUCTIVITY, STRUCTURAL-PROPERTIES, PHASE-STABILITY, ION CONDUCTION, SYSTEM, ELECTROLYTES, TEMPERATURE, DIFFRACTION, TRANSFORMATION
  • Erciyes Üniversitesi Adresli: Evet

Özet

Sm2O3, Gd2O3, Eu2O3 triple-doped Bi2O3 based quaternary solid solutions were synthesized as a candidate electrolyte material using the solid-state reaction technique. The structural, thermal and electrical conductivity features of the ceramic samples were examined and compared by using X-ray powder diffraction (XRD), thermal gravimetry/differantial thermal analysis (TG/ DTA) and the four-point probe technique (4PPT). The result of XRD measurements indicated that the (Bi2O3)((1-x-y-z))(Gd2O3)(x)(Sm2O3)(y)(Eu2O3)(z) (x = 10/y = 10/z = 5, 15, 20 mol % and x = 10/y = 5, 10, 15, 20/z = 10 mol %) samples have a stable face-centered cubic delta-phase and mixed phase crystallographic structure. The phase stability was also checked by the DTA evaluations results. The temperature dependent electrical conductivity measurements showed that the highest electrical conductivity was observed for the sample of the (Bi2O3)(0.75)(Gd2O3)(0.10)(Sm2O3)(0.05)(Eu2O3)(0.10) system which has a stable and delta-phase was found as 6.67 X 10(-3) (Omega cm)(-1) at 650 degrees C. This sample can be used as an electrolyte material in the solid oxide fuel cells (SOFCs) which is possible to operate at intermediate temperature ranges. The activation energy was also calculated at a low temperature range (350-650 degrees C) and high temperature range (above 650 degrees C). The values for the samples vary from 0.63 eV to 1.08 eV at low temperature and at high temperature they vary from 0.43 eV to 0.75 eV.