Accardo, G. Frattini, D. Yoon, S. P. 2024-01-19T16:33:40Z 2024-01-19T16:33:40Z 2021-09-02 2020-09-05 0925-8388 https://pubs.kist.re.kr/handle/201004/118134 Microstructural and electrochemical investigations of bi-doped (Gd and Co) barium cerate perovskites, with theoretical formula BaCe(0.85-x)CoxGd0.15O3-delta (x = 0.02; 0.03 and 0.05) were carried out by X-ray Diffraction (XRD), Rietveld refinement, scanning electron microscopy (SEM), Raman, X-ray photoelectron spectroscopy (XPS), and electrochemical impedance spectroscopy analysis (EIS). Based on the ionic radii of Co2+ (0.75 angstrom) and Co3+ (0.55 angstrom, six-fold coordination), Co ions did not substitute Ba ions on the A-sites of the ABO 3 perovskite and therefore substituted Ce ions on the B-sites. The behavior was confirmed by Raman analysis where it was found that cobalt doping stabilized the perovskite arrangement favoring a higher symmetry structure. From the XPS analysis, an increase in oxygen vacancies as the surface defect for proton conduction was detected in the samples with higher cobalt content. These samples showed the highest proton conductivity of 4.81.10(-3)-4.36.10(-2) S cm(-1) in the temperature range 200-800 degrees C. (C) 2020 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA OXIDE FUEL-CELLS ELECTRICAL-PROPERTIES IONIC-RADII NEUTRON-DIFFRACTION CHEMICAL-STABILITY BACEO3 TEMPERATURE ELECTROLYTES PHASE CU Enhanced proton conductivity of Gd-Co bi-doped barium cerate perovskites based on structural and microstructural investigations Article 10.1016/j.jallcom.2020.155114 1 JOURNAL OF ALLOYS AND COMPOUNDS, v.834 JOURNAL OF ALLOYS AND COMPOUNDS 834 scie scopus 000534494200004 2-s2.0-85083314404 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article OXIDE FUEL-CELLS ELECTRICAL-PROPERTIES IONIC-RADII NEUTRON-DIFFRACTION CHEMICAL-STABILITY BACEO3 TEMPERATURE ELECTROLYTES PHASE CU Barium cerate perovskite Cobalt Proton conduction Sol-gel combustion SOFC