A nanocomposite material for highly durable solid oxide fuel cell cathodes

Hwa Seob Song, Sang Hoon Hyun, Joosun Kim, Hae Weon Lee, Jooho Moon

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22 Citations (Scopus)

Abstract

We have synthesized well-engineered nanocomposite particles for the achievement of highly durable solid oxide fuel cell cathodes. The use of a dual-composite approach in which both LSM and YSZ phases are placed on a YSZ grain allows for the development of an ideal cathode microstructure with improved phase contiguity and interfacial coherence. Microstructural observations in conjunction with impedance analysis during accelerated lifetime tests clearly reveal that three-dimensionally interconnected percolative networks of both electronic and ionic conduction give cells based on the dual-composite cathode better long-term stability. A cell with such a well-controlled cathode maintains nearly constant power density over 500 h. In contrast, a cathode prepared by mechanical mixing undergoes significant degradation during the stability test due to thermochemically and electrochemically driven coarsening and shrinkage of the LSM phase.

Original languageEnglish
Pages (from-to)1087-1092
Number of pages6
JournalJournal of Materials Chemistry
Volume18
Issue number10
DOIs
Publication statusPublished - 2008 Mar 4

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

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