Removal of Nitric Oxide (NO) by perovskite-type composite catalytic thick film, la0.6Sr0.4Co0.2Fe0.8O 3-δ and gadolinia-doped ceria electrolyte, Gd 0.2Ce0.8O2-δ

Hae Jin Hwang, Ji Woong Moon, Joo Ho Moon, Masanobu Awano

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Electrochemical cells consisting of a La0.6Sr 0.4Co0.2Fe0.8O3-δ (LSCF)-Gd0.2Ce0.8O2-δ (CGO) composite catalytic electrode and a CGO solid electrolyte were fabricated for direct nitric oxide (NO) decomposition, and the electrocatalytic properties and NO decomposition behaviors of the cells were investigated. The electrochemical cells were operated at 600°C in a reactant gas mixture containing 1000 ppm NO and 2% O2 in He, with a flow rate of 50 mL/min. LSCF sintered at temperatures <1000°C seemed to be a better electrode for oxygen reduction than LSCF sintered at 1100°C and platinum (Pt) (+CGO) sintered at 1000°C. An LSCF/CGO/LSCF electrochemical cell sintered at high temperature showed low ohmic resistance, because of good physical contact between the LSCF and the CGO, whereas grain growth and crystal-structure change appeared to lead to high polarization resistance. Two electrochemical reactions, NO and O 2 reductions, occurred at the cathode when the electric current was applied to the electrochemical cells. Of the two reactions, O2 reduction was the preferred reaction, and this tendency was predominant at the LSCF electrode, which had a high affinity for oxygen. Although the onset current for NO decomposition of the LSCF/CGO/LSCF electrochemical cell was slightly higher than that of the other electrochemical cells, excess oxygen could be effectively pumped at a relatively low voltage (<1.3 V at 600°C). As a result, the LSCF/CGO/LSCF electrochemical cell significantly decreased the electric power needed to decompose NO.

Original languageEnglish
Pages (from-to)79-84
Number of pages6
JournalJournal of the American Ceramic Society
Volume88
Issue number1
DOIs
Publication statusPublished - 2005 Jan 1

Fingerprint

gadolinium
Electrochemical cells
Gadolinium
Cerium compounds
Nitric oxide
perovskite
nitric oxide
Thick films
Perovskite
electrolyte
Electrolytes
Nitric Oxide
Composite materials
electrode
decomposition
oxygen
Oxygen
Decomposition
Electrodes
Acoustic impedance

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

Cite this

@article{8944616b85b541eca71f25cc1a1ee429,
title = "Removal of Nitric Oxide (NO) by perovskite-type composite catalytic thick film, la0.6Sr0.4Co0.2Fe0.8O 3-δ and gadolinia-doped ceria electrolyte, Gd 0.2Ce0.8O2-δ",
abstract = "Electrochemical cells consisting of a La0.6Sr 0.4Co0.2Fe0.8O3-δ (LSCF)-Gd0.2Ce0.8O2-δ (CGO) composite catalytic electrode and a CGO solid electrolyte were fabricated for direct nitric oxide (NO) decomposition, and the electrocatalytic properties and NO decomposition behaviors of the cells were investigated. The electrochemical cells were operated at 600°C in a reactant gas mixture containing 1000 ppm NO and 2{\%} O2 in He, with a flow rate of 50 mL/min. LSCF sintered at temperatures <1000°C seemed to be a better electrode for oxygen reduction than LSCF sintered at 1100°C and platinum (Pt) (+CGO) sintered at 1000°C. An LSCF/CGO/LSCF electrochemical cell sintered at high temperature showed low ohmic resistance, because of good physical contact between the LSCF and the CGO, whereas grain growth and crystal-structure change appeared to lead to high polarization resistance. Two electrochemical reactions, NO and O 2 reductions, occurred at the cathode when the electric current was applied to the electrochemical cells. Of the two reactions, O2 reduction was the preferred reaction, and this tendency was predominant at the LSCF electrode, which had a high affinity for oxygen. Although the onset current for NO decomposition of the LSCF/CGO/LSCF electrochemical cell was slightly higher than that of the other electrochemical cells, excess oxygen could be effectively pumped at a relatively low voltage (<1.3 V at 600°C). As a result, the LSCF/CGO/LSCF electrochemical cell significantly decreased the electric power needed to decompose NO.",
author = "Hwang, {Hae Jin} and Moon, {Ji Woong} and Moon, {Joo Ho} and Masanobu Awano",
year = "2005",
month = "1",
day = "1",
doi = "10.1111/j.1551-2916.2004.00025.x",
language = "English",
volume = "88",
pages = "79--84",
journal = "Journal of the American Ceramic Society",
issn = "0002-7820",
publisher = "Wiley-Blackwell",
number = "1",

}

Removal of Nitric Oxide (NO) by perovskite-type composite catalytic thick film, la0.6Sr0.4Co0.2Fe0.8O 3-δ and gadolinia-doped ceria electrolyte, Gd 0.2Ce0.8O2-δ. / Hwang, Hae Jin; Moon, Ji Woong; Moon, Joo Ho; Awano, Masanobu.

In: Journal of the American Ceramic Society, Vol. 88, No. 1, 01.01.2005, p. 79-84.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Removal of Nitric Oxide (NO) by perovskite-type composite catalytic thick film, la0.6Sr0.4Co0.2Fe0.8O 3-δ and gadolinia-doped ceria electrolyte, Gd 0.2Ce0.8O2-δ

AU - Hwang, Hae Jin

AU - Moon, Ji Woong

AU - Moon, Joo Ho

AU - Awano, Masanobu

PY - 2005/1/1

Y1 - 2005/1/1

N2 - Electrochemical cells consisting of a La0.6Sr 0.4Co0.2Fe0.8O3-δ (LSCF)-Gd0.2Ce0.8O2-δ (CGO) composite catalytic electrode and a CGO solid electrolyte were fabricated for direct nitric oxide (NO) decomposition, and the electrocatalytic properties and NO decomposition behaviors of the cells were investigated. The electrochemical cells were operated at 600°C in a reactant gas mixture containing 1000 ppm NO and 2% O2 in He, with a flow rate of 50 mL/min. LSCF sintered at temperatures <1000°C seemed to be a better electrode for oxygen reduction than LSCF sintered at 1100°C and platinum (Pt) (+CGO) sintered at 1000°C. An LSCF/CGO/LSCF electrochemical cell sintered at high temperature showed low ohmic resistance, because of good physical contact between the LSCF and the CGO, whereas grain growth and crystal-structure change appeared to lead to high polarization resistance. Two electrochemical reactions, NO and O 2 reductions, occurred at the cathode when the electric current was applied to the electrochemical cells. Of the two reactions, O2 reduction was the preferred reaction, and this tendency was predominant at the LSCF electrode, which had a high affinity for oxygen. Although the onset current for NO decomposition of the LSCF/CGO/LSCF electrochemical cell was slightly higher than that of the other electrochemical cells, excess oxygen could be effectively pumped at a relatively low voltage (<1.3 V at 600°C). As a result, the LSCF/CGO/LSCF electrochemical cell significantly decreased the electric power needed to decompose NO.

AB - Electrochemical cells consisting of a La0.6Sr 0.4Co0.2Fe0.8O3-δ (LSCF)-Gd0.2Ce0.8O2-δ (CGO) composite catalytic electrode and a CGO solid electrolyte were fabricated for direct nitric oxide (NO) decomposition, and the electrocatalytic properties and NO decomposition behaviors of the cells were investigated. The electrochemical cells were operated at 600°C in a reactant gas mixture containing 1000 ppm NO and 2% O2 in He, with a flow rate of 50 mL/min. LSCF sintered at temperatures <1000°C seemed to be a better electrode for oxygen reduction than LSCF sintered at 1100°C and platinum (Pt) (+CGO) sintered at 1000°C. An LSCF/CGO/LSCF electrochemical cell sintered at high temperature showed low ohmic resistance, because of good physical contact between the LSCF and the CGO, whereas grain growth and crystal-structure change appeared to lead to high polarization resistance. Two electrochemical reactions, NO and O 2 reductions, occurred at the cathode when the electric current was applied to the electrochemical cells. Of the two reactions, O2 reduction was the preferred reaction, and this tendency was predominant at the LSCF electrode, which had a high affinity for oxygen. Although the onset current for NO decomposition of the LSCF/CGO/LSCF electrochemical cell was slightly higher than that of the other electrochemical cells, excess oxygen could be effectively pumped at a relatively low voltage (<1.3 V at 600°C). As a result, the LSCF/CGO/LSCF electrochemical cell significantly decreased the electric power needed to decompose NO.

UR - http://www.scopus.com/inward/record.url?scp=23844471698&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=23844471698&partnerID=8YFLogxK

U2 - 10.1111/j.1551-2916.2004.00025.x

DO - 10.1111/j.1551-2916.2004.00025.x

M3 - Article

VL - 88

SP - 79

EP - 84

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

SN - 0002-7820

IS - 1

ER -