Modified strontium titanates: From defect chemistry to SOFC anodes

M.C. Verbraeken, Tania Ramos, Karsten Agersted, Q. Ma, C.D. Savaniu, Bhaskar Reddy Sudireddy, J.T.S. Irvine, Peter Holtappels, F. Tietz

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Abstract

Modified strontium titanates have received much attention recently for their potential as anode material in solid oxide fuel cells (SOFC). Their inherent redox stability and superior tolerance to sulphur poisoning and coking as compared to Ni based cermet anodes could improve durability of SOFC systems dramatically. Various substitution strategies can be deployed to optimise materials properties in these strontium titanates, such as electronic conductivity, electrocatalytic activity, chemical stability and sinterability, and thus mechanical strength. Substitution strategies not only cover choice and amount of substituent, but also perovskite defect chemistry, distinguishing between A-site deficiency (A1-xBO3) and cation-stoichiometry (ABO3+δ). Literature suggests distinct differences in the materials properties between the latter two compositional approaches. After discussing the defect chemistry of modified strontium titanates, this paper reviews three different A-site deficient donor (La, Y, Nb) substituted strontium titanates for their electrical behaviour and fuel cell performance. Promising performances in both electrolyte as well as anode supported cell designs have been obtained, when using hydrogen as fuel. Performances are retained after numerous redox cycles. Long term stability in sulphur and carbon containing fuels still needs to be explored in greater detail. This journal is
Original languageEnglish
JournalRSC Advances
Volume5
Issue number2
Pages (from-to)1168-1180
ISSN2046-2069
DOIs
Publication statusPublished - 2015

Keywords

  • Anodes
  • Catalyst activity
  • Cermets
  • Chemical stability
  • Defects
  • Materials properties
  • Niobium
  • Strength of materials
  • Strontium
  • Strontium titanates
  • Sulfur
  • Titanium compounds
  • A-site deficiencies
  • Anode supported cell
  • Carbon containing
  • Electrocatalytic activity
  • Electronic conductivity
  • Fuel cell performance
  • Long term stability
  • Sulphur poisoning
  • Solid oxide fuel cells (SOFC)

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