Investigation of different efficient precipitation agents for the synthesis of superior oxide-ion conductor Ce0.8Sm0.2O1.9 ceramic electrolytes for intermediate temperature-solid oxide fuel cells

SARIBOĞA V.

MATERIALS TODAY COMMUNICATIONS, cilt.33, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 33
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.mtcomm.2022.104463
  • Dergi Adı: MATERIALS TODAY COMMUNICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, INSPEC
  • Anahtar Kelimeler: Solid oxide fuel cells, Samaria doped Ceria, Ceramics, Electrolyte, Precipitation synthesis, DOPED CERIA ELECTROLYTE, ELECTRICAL-PROPERTIES, CARBONATE COPRECIPITATION, OXALATE COPRECIPITATION, HYDROTHERMAL SYNTHESIS, COMBUSTION SYNTHESIS, POWDERS, SOFC, PERFORMANCE, SM
  • İstanbul Üniversitesi Adresli: Hayır

Özet

In this study, the superior oxide ion conductor 20% Sm-doped CeO2 (SDC20) structure was synthesized by using four different efficient precipitation methods to be used as electrolyte in solid oxide fuel cells: hydroxide, oxalate, and solvothermal and hexamethylenetetramine precipitation. In order to avoid unnecessary crystallite growth, the precipitated precursors were calcined at different temperatures specific to the method used. The powders were pelleted by uniaxial and cold isostatic press and then the pellets were sintered at 1200 and 1400 degrees C. Powder characterization were made by Thermogravimetric Analysis, Energy Dispersive X-Ray Analysis, X-Ray Diffraction and Scanning Electron Microscopy. The O2- ion conductivity of the pellets were determined by Electrochemical Impedance Spectroscopy in a static air environment. The O2- ion conductivity of the pellets were also compared with a commercial product. Solvothermal precipitated SDC20 stood out as the best method of the study by showing O2- ion conduction 65% superior to the commercial SDC20 sample with a conductivity of 9.2 x 10(-2) Scm(-1) at 800 degrees C.