NO decomposition over the electrochemical cell of lanthanum stannate pyrochlore and YSZ composite electrode

Sarohan Park, Hwa Seob Song, Heon Jin Choi, Jooho Moon

Research output: Contribution to journalConference article

17 Citations (Scopus)

Abstract

NOx decomposition over the electrochemical cell that involves oxygen-conducting membrane and lanthanum stannate pyrochlore catalysts has been investigated. Removal of the oxygen adsorbed on the active sites, triple-phase boundaries, was prerequisite for electrochemical NOx decomposition. NOx was decomposed only after the minimum current density was applied and its conversion increased abruptly with increasing the applied current. Decomposition activity was also strongly influenced by composition, microstructure, and configuration of the working electrode. Higher decomposition was observed for the cell composed of (La2Sn 2O7+YSZ)/Pt composite electrode than the platinum electrode. Such the cell sintered at 1500°C decomposed 87% NOx at the current density ∼194 mA/cm2 in the reactant gas containing 2% O2 whereas 80.5% NOx was reduced at 325 mA/cm2 under 4% O2 condition.

Original languageEnglish
Pages (from-to)625-629
Number of pages5
JournalSolid State Ionics
Volume175
Issue number1-4
DOIs
Publication statusPublished - 2004 Nov 30
EventFourteenth International Conference on Solid State Ionics - Monterey, CA., United States
Duration: 2003 Jun 222003 Jun 27

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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