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Improving oxygen electrodes by infiltration and surface decoration

Hendriksen, P. V ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1149/09101.1413ecst
  3. Publisher: Electrochemical Society Inc , 2019
  4. Abstract:
  5. For improving competitiveness of SOEC/SOFC-technology it is desirable to reduce the temperature of operation down towards 500 oC - 600 oC. This requires improvement of the oxygen electrode such that this does not limit performance. Here, we report results on modifying various back-bone type oxygen electrodes via infiltration of materials targeting a surface decoration with Pr-oxide or Pr,Ni,Cu-oxides. Different composite back-bone electrodes (based on micron-sized particles) were investigated; La0.6Sr0.4Co0.2Fe0.8O3/Ce0.9Gd0.1O2, (LSCF/CGO), La0.6Sr0.4FeO3 (LSF), and LaNi0.6Fe0.4O3/Ce0.9Gd0.1O2 (LNF/CGO). Marked performance improvements could be achieved with the infiltration, including a reduction by a factor of 3 of the polarization resistance at 600 oC for both LSF and the LSCF/CGO based state of the art electrodes. In a LNF/CGO composite backbone, infiltration with Pr-nitrate led to marked electrode performance improvement; reaching 0.14 Ωcm2 at 550 oC and 0.4 Ωcm2 at 500 oC, sufficiently fast not to limit overall cell performance (at 550 oC). © The Electrochemical Society
  6. Keywords:
  7. Bone ; Cerium compounds ; Copper oxides ; Gadolinium compounds ; Iron compounds ; Lanthanum compounds ; Nickel oxide ; Oxygen ; Praseodymium compounds ; Regenerative fuel cells ; Solid oxide fuel cells (SOFC) ; Strontium compounds ; Cell performance ; Electrode performance ; La0.6sr0.4co0.2fe0.8o3 ; Micron-sized particles ; Oxygen electrode ; Polarization resistances ; State of the art ; Surface decoration ; Electrodes
  8. Source: 16th International Symposium on Solid Oxide Fuel Cells, SOFC 2019, 8 September 2019 through 13 September 2019 ; Volume 91, Issue 1 , 2019 , Pages 1413-1424 ; 19386737 (ISSN); 9781607688747 (ISBN)
  9. URL: https://iopscience.iop.org/article/10.1149/09101.1413ecst