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Step-change in high temperature steam electrolysis performance of perovskite oxide cathodes with exsolution of B-site dopants

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George Tsekouras, Dragos Neagu, John T. S. Irvine

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B-site doped, A-site deficient perovskite oxide titanates with formula La0.4Sr0.4Mnxn+Ti1-xO3-gamma-delta (M = Fe3+ or Ni2+; x = 0.06; gamma = (4 - n)x/2) were employed as solid oxide electrolysis cell (SOEC) cathodes for hydrogen production via high temperature steam electrolysis at 900 degrees C. A-site deficiency provided additional driving force for the exsolution of a proportion of B-site dopants at the surface in the form of metallic nanoparticles under reducing SOEC cathode operating conditions. In the case of La0.4Sr0.4Fe0.06Ti0.94O2.97, this represents the first time that Fe-0 has been exsolved from a perovskite in such a way. Exsolution was due in part to the inability of the host lattice to accommodate vacancies (introduced (delta) oxygen vacancies (V-o(..)) and fixed A-site (V-Sr('')) and inherent (gamma) oxygen vacancies) beyond a certain limit. The presence of electrocatalytically active Fe-0 or Ni-0 nanoparticles and higher V-o(..) concentrations dramatically lowered the activation barrier to steam electrolysis compared to the parent material (x = 0). The use of defect chemistry to drive the exsolution of less reducible dopant cations could conceivably be extended to produce new catalytically active perovskites with unique properties.



Original languageEnglish
Pages (from-to)256-266
Number of pages11
JournalEnergy & Environmental Science
Issue number1
Publication statusPublished - Jan 2013

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