Electrochemical decomposition of NO over composite electrodes on YSZ electrolyte

Hwa Seob Song, Jooho Moon, Hae Jin Hwang

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

NO decomposition over electrochemical cells that involve a bilayered composite electrode has been investigated. NO was decomposed only after a minimum current density was applied and its conversion increased abruptly with increasing applied current. The compositions of phases and their spatial distribution on the cathode strongly influenced the decomposition activity as a function of the current density since they are directly correlated with the site and number densities of the triple-phase boundary and the electrochemically induced active site, i.e., F-center. The [(La2Sn2O7 + YSZ)/ Pt] electrode could convert more than 85% of NO into N2 at 200 mA/cm2 whereas only 27% was decomposed over the platinum electrode although the latter was more electrochemically active at lower current ∼70 mA/cm2. The addition of Pt into the [(La2Sn2O7 + YSZ)/Pt] composite electrode not only expands the densities of the tpb and F-centers but also enhances competitive NO adsorption as indirectly confirmed by impedance spectroscopy, both of which promote NO conversion at the lower current density.

Original languageEnglish
Pages (from-to)981-986
Number of pages6
JournalJournal of the European Ceramic Society
Volume26
Issue number6
DOIs
Publication statusPublished - 2006 Jan 24

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Electrolytes
Decomposition
Electrodes
Current density
Composite materials
Electrochemical cells
Phase boundaries
Platinum
Spatial distribution
Cathodes
Spectroscopy
Adsorption
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

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abstract = "NO decomposition over electrochemical cells that involve a bilayered composite electrode has been investigated. NO was decomposed only after a minimum current density was applied and its conversion increased abruptly with increasing applied current. The compositions of phases and their spatial distribution on the cathode strongly influenced the decomposition activity as a function of the current density since they are directly correlated with the site and number densities of the triple-phase boundary and the electrochemically induced active site, i.e., F-center. The [(La2Sn2O7 + YSZ)/ Pt] electrode could convert more than 85{\%} of NO into N2 at 200 mA/cm2 whereas only 27{\%} was decomposed over the platinum electrode although the latter was more electrochemically active at lower current ∼70 mA/cm2. The addition of Pt into the [(La2Sn2O7 + YSZ)/Pt] composite electrode not only expands the densities of the tpb and F-centers but also enhances competitive NO adsorption as indirectly confirmed by impedance spectroscopy, both of which promote NO conversion at the lower current density.",
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Electrochemical decomposition of NO over composite electrodes on YSZ electrolyte. / Song, Hwa Seob; Moon, Jooho; Hwang, Hae Jin.

In: Journal of the European Ceramic Society, Vol. 26, No. 6, 24.01.2006, p. 981-986.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Electrochemical decomposition of NO over composite electrodes on YSZ electrolyte

AU - Song, Hwa Seob

AU - Moon, Jooho

AU - Hwang, Hae Jin

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N2 - NO decomposition over electrochemical cells that involve a bilayered composite electrode has been investigated. NO was decomposed only after a minimum current density was applied and its conversion increased abruptly with increasing applied current. The compositions of phases and their spatial distribution on the cathode strongly influenced the decomposition activity as a function of the current density since they are directly correlated with the site and number densities of the triple-phase boundary and the electrochemically induced active site, i.e., F-center. The [(La2Sn2O7 + YSZ)/ Pt] electrode could convert more than 85% of NO into N2 at 200 mA/cm2 whereas only 27% was decomposed over the platinum electrode although the latter was more electrochemically active at lower current ∼70 mA/cm2. The addition of Pt into the [(La2Sn2O7 + YSZ)/Pt] composite electrode not only expands the densities of the tpb and F-centers but also enhances competitive NO adsorption as indirectly confirmed by impedance spectroscopy, both of which promote NO conversion at the lower current density.

AB - NO decomposition over electrochemical cells that involve a bilayered composite electrode has been investigated. NO was decomposed only after a minimum current density was applied and its conversion increased abruptly with increasing applied current. The compositions of phases and their spatial distribution on the cathode strongly influenced the decomposition activity as a function of the current density since they are directly correlated with the site and number densities of the triple-phase boundary and the electrochemically induced active site, i.e., F-center. The [(La2Sn2O7 + YSZ)/ Pt] electrode could convert more than 85% of NO into N2 at 200 mA/cm2 whereas only 27% was decomposed over the platinum electrode although the latter was more electrochemically active at lower current ∼70 mA/cm2. The addition of Pt into the [(La2Sn2O7 + YSZ)/Pt] composite electrode not only expands the densities of the tpb and F-centers but also enhances competitive NO adsorption as indirectly confirmed by impedance spectroscopy, both of which promote NO conversion at the lower current density.

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