(bi,sr) (fe1−x,mx)o3−δ (m = co, ni and mn) cathode materials with mixed electro-ionic conductivity

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ID: 244807
2016
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Abstract
(Bi,Sr)FeO3−δ (BSF) cathode materials doped with either Co, Ni or Mn are synthesized by an ethylene diamine tetra-acetic acid (EDTA)-citrate complexing method, and the effects of the doping level on the mixed electronic-ionic conductivity at various temperatures are studied up to 800 °C. The phase purity and solid solution limit are investigated by X-ray diffraction (XRD). The ionic conductivity is measured by the four-probe direct current (DC) method, the valence state of Fe and Mn by X-ray photoelectron spectroscopy (XPS), and the oxygen non-stoichiometry by differential thermo-gravimetric analysis (TGA). The doped ferrites show interesting electronic conductivity dependent on the testing temperature, implying two conductive mechanisms, either controlled by double exchange at lower temperatures or small polaron (electron-oxygen vacancy) conduction at temperatures greater than 400 °C. The results of Co-doped BSF (S50C20) show the best mixed conductivity among the ferrites, and this is used to assemble cells. The cell with a S50C20 cathode in the region of 600–800 °C is improved by 15% in maximum power density greater than the cell with La0.6Sr0.4Co0.2Fe0.8O3−δ (LSCF) due to the balanced contribution from oxygen ions, vacancies and electrons.
Reference Key
wei2016materials(bi,sr) Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Wen-Cheng J. Wei;Der-Rong Huang;Dan Wang
Journal Nature Materials
Year 2016
DOI
10.3390/ma9110922
URL
http://www.mdpi.com/1996-1944/9/11/922
Keywords
Fuel cell bismuth ferrite cathode electronics civil engineering (general)microscopydescriptive and experimental mechanics nuclear engineeringengineering (general)

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