6533b86efe1ef96bd12cb5a4

RESEARCH PRODUCT

Structural analysis, phase stability and electrochemical characterization of Nb doped BaCe0.9Y0.1O3−x electrolyte for IT-SOFCs

Alessandra D'epifanioSilvia LicocciaAntonino MartoranaChiara PugnaliniAlessandro LongoFrancesco GianniciElisabetta Di Bartolomeo

subject

exafMaterials scienceHigh temperature proton conductors (HTPCs)Absorption spectroscopyDopantNb-dopingRenewable Energy Sustainability and the EnvironmentBarium ceratesofcSettore ING-IND/22 - Scienza e Tecnologia dei MaterialiStructural analysiSettore CHIM/07 - Fondamenti Chimici delle TecnologieAnalytical chemistryEnergy Engineering and Power TechnologyElectrolyteElectrochemical performancefuel cellsHigh temperature proton conductors (HTPCs) Barium cerates Nb-doping Structural analysis Electrochemical performanceConductivityAtmospheric temperature rangeDielectric spectroscopyChemical stabilityElectrical and Electronic EngineeringPhysical and Theoretical ChemistryPolarization (electrochemistry)

description

Abstract To improve the chemical stability of high temperature proton conductors based on barium cerate, electrolyte powders doped with different amounts of niobium were synthesized by the citrate–nitrate auto-combustion method. Pure single phases of BaCe 0.9− x Nb x Y 0.1 O 3− x (BCYN, 0.03 ≤  x  ≤ 0.12) were obtained by thermal treatment at 1000 °C. Sintering at 1450 °C for 10 h produced dense pellets. X-ray absorption spectroscopy allowed to define the dopant ion insertion site and the co-dopant valency. Treatments in pure CO 2 atmosphere at 700 °C for 3 h and subsequent XRD analysis were carried out to probe the chemical stability of the produced electrolytes. The influence of the presence of Nb 5+ on conductivity has been investigated by electrochemical impedance spectroscopy (EIS) measurements. Polarization curves were acquired in the 400–750 °C temperature range.

yearjournalcountryeditionlanguage
2012-02-01
10.1016/j.jpowsour.2011.10.038http://hdl.handle.net/2108/40513