Abstract
Different physical (FIB-TOF-SIMS, SXAS, XRD, high-temperature XRD under electrochemical working conditions, FIB-SEM-EDX, AFM, gas chromatography-mass spectrometry, BET) and electrochemical (cyclic voltammetry, chronoamperometry and electrochemical impedance) methods have been applied for detailed analysis of solid oxide fuel cell materials. Solid oxide fuel and co-electrolysis cell single cells based on Ni-free anodes/cathodes as well as Ni-Ce0.9Gd0.1O2- d or Ni-Zr0.92Y0.08O2- d supporting anodes/cathodes, bi-layered Zr0.92Y0.08O2- d | Ce0.9Gd0.1O2- d or Zr0.94Sc0.06O2- d | Ce0.9Gd0.1O2- d electrolytes and micro-meso-porous La0.6Sr0.4CoO3- d, Gd0.6Sr0.4CoO3- d, La0.6Sr0.4Co0.8Fe0.2O3- d or Pr0.6Sr0.4CoO3- d cathodes/anodes, respectively. For preparation of electrodes and electrolytes various nano-microporous powders, different sintering temperatures and pore former additions in the raw cathode and anode pastes have been applied. Ni-free anodes/cathodes have been synthesized using the impregnation method and tested at temperatures from 650 to 800 °C. Influence of the electrodes porosity, chemical composition and also of the bi-layered electrolyte properties on the power density of the SOFC and SOEC single cells has been established and analyzed. The synchrotron radiation based X-ray absorption spectroscopy under electrochemical polarization and different fuel feeding (pressure, gas flow rate, etc.), chemical composition (H2S and other sulphur containing compounds, halides, etc.) and temperature cycling conditions has been applied for chemical analysis of surface composition of the SOFC anodes.
Published Version
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