Effect of complex oxide promoters and Pd on activity and stability of Ni/YSZ (ScSZ) cermets as anode materials for IT SOFC

VA Sadykov, NV Mezentseva, RV Bunina, GM Alikina, AI Lukashevich, TS Kharlamov, VA Rogov, VI Zaikovskii, AV Ishchenko, TA Krieger, OF Bobrenok, A Smirnova, John Thomas Sirr Irvine, OD Vasylyev

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Effect of fluorite-like or perovskite-like complex oxide promoters, Pd and Cu on the performance of Ni/8YSZ and Ni/ScCeSZ anode materials in CH4 steam reforming (SR) or selective oxidation (SO) by O-2 into syngas was studied. The spatial distribution of dopants in composites before and after contact with the reaction feed, features of components mutual interaction and forms of deposited coke were controlled by TEM combined with EDX analysis. The lattice oxygen mobility and reactivity were estimated by CH4 and H-2 temperature-programmed reduction (TPR), and the amount of deposited carbon after operation in the feed with stoichiometric H2O/CH4 ratio was estimated by the temperature-programmed oxidation. Promoters decrease the amount of deposited coke, while doping by Pd or Cu ensures also a good and stable performance at moderate (similar to 550 degrees C) temperatures required for the intermediate-temperature solid oxide fuel cells (IT SOFC) operation. (c) 2007 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)226-237
Number of pages12
JournalCatalysis Today
Volume131
Issue number1-4
DOIs
Publication statusPublished - 29 Feb 2008

Keywords

  • SOFC composite anodes
  • methane steam reforming
  • promoters
  • microstructure
  • TEM
  • EDX
  • H-2 and CH4 TPR
  • TEMPERATURE FUEL-CELLS
  • SELECTIVE OXIDATION
  • CHEMICAL-PROPERTIES
  • METHANE OXIDATION
  • SOLID-SOLUTIONS
  • CERIUM DIOXIDE
  • CATALYSTS
  • PERFORMANCE
  • ZIRCONIA
  • GD

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