Ab initio evaluation of oxygen diffusivity in LaFeO3: The role of lanthanum vacancies

Andrew M. Ritzmann, Ana B. Muñoz-García, Michele Pavone, John A. Keith, Emily A. Carter

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Solid oxide fuel cells (SOFCs) are attractive for clean and efficient electricity generation, but high operating temperatures (T op > 800 °C) limit their widespread usage. Oxygen ion conducting cathode materials (mixed ion-electron conductors, MIECs), such as La1-xSr xCo1-yFe yO3 (LSCF), enable lower T op by reducing cathode polarization losses. Understanding how composition affects oxygen diffusion in LaFeO3 is vitally important for designing high-performance LSCF cathodes. To do this, we employ first-principles density functional theory plus U (DFT+U) calculations to show how lanthanum vacancies in LaFeO3 dramatically change the oxygen diffusion coefficient. Our ab initio results show that A-site substoichiometry is a viable route to increased oxygen diffusion and higher SOFC performance.

Original languageEnglish (US)
Pages (from-to)161-166
Number of pages6
JournalMRS Communications
Volume3
Issue number3
DOIs
StatePublished - 2013

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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