Optical, mechanical and electrical properties of LSCF–SDC composite cathode prepared by sol–gel assisted rotary evaporation technique

S. A. Muhammed Ali, Mustafa Anwar, Nor Fatina Raduwan, Andanastuti Muchtar, Mahendra Rao Somalu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) is a perovskite-type oxide that exhibits excellent mixed ionic–electronic conducting properties and is a suitable cathode material for intermediate temperature solid oxide fuel cells. This study investigates the microstructural, optical, mechanical, and electrical properties of an LSCF–samarium-doped ceria (SDC) composite cathode. LSCF–SDC composite cathode powders were prepared by mixing 50 wt% SDC electrolyte with LSCF cathode powders obtained by the rotary evaporation technique. The band gap of the prepared powders was determined via diffuse reflectance UV–visible spectroscopy. The chemical composition, mechanical properties, and electrochemical properties of the sintered pellets were characterized using Raman spectroscopy, Vickers hardness, and impedance spectroscopy, respectively. X-ray diffraction and Rietveld analysis showed that phase purity was only 96%. Moreover, a small fraction of tetragonal phase impurity was observed on the LSCF powders. Impurities significantly affected the phase stability and microstructure of the LSCF–SDC composite cathode. The addition of the SDC electrolyte enhanced the densification of the composite cathode, thereby improving mechanical properties. However, the addition of SDC exerted different effects on the DC electrical conductivity and area-specific resistance (ASR) of the composite cathode. At 800 °C, the ASR value of the LSCF was only 2% that of the LSCF–SDC composite cathode. Overall, the electrical properties of the LSCF–SDC composite cathode are closely related to the crystal structure, purity, and microstructure of LSCF cathode powders. [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)493-504
Number of pages12
JournalJournal of Sol-Gel Science and Technology
Volume86
Issue number2
DOIs
Publication statusPublished - 1 May 2018

Fingerprint

Evaporation
Electric properties
Cathodes
Optical properties
cathodes
electrical properties
evaporation
mechanical properties
optical properties
Mechanical properties
composite materials
Composite materials
Powders
Electrolytes
purity
electrolytes
Spectroscopy
Impurities
Rietveld analysis
impurities

Keywords

  • Band gap
  • Composite cathode
  • Electrical properties
  • LSCF
  • Rotary evaporation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Chemistry(all)
  • Biomaterials
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Optical, mechanical and electrical properties of LSCF–SDC composite cathode prepared by sol–gel assisted rotary evaporation technique. / Muhammed Ali, S. A.; Anwar, Mustafa; Raduwan, Nor Fatina; Muchtar, Andanastuti; Somalu, Mahendra Rao.

In: Journal of Sol-Gel Science and Technology, Vol. 86, No. 2, 01.05.2018, p. 493-504.

Research output: Contribution to journalArticle

@article{91cc263694a34ff29737a217deec7ed7,
title = "Optical, mechanical and electrical properties of LSCF–SDC composite cathode prepared by sol–gel assisted rotary evaporation technique",
abstract = "La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) is a perovskite-type oxide that exhibits excellent mixed ionic–electronic conducting properties and is a suitable cathode material for intermediate temperature solid oxide fuel cells. This study investigates the microstructural, optical, mechanical, and electrical properties of an LSCF–samarium-doped ceria (SDC) composite cathode. LSCF–SDC composite cathode powders were prepared by mixing 50 wt{\%} SDC electrolyte with LSCF cathode powders obtained by the rotary evaporation technique. The band gap of the prepared powders was determined via diffuse reflectance UV–visible spectroscopy. The chemical composition, mechanical properties, and electrochemical properties of the sintered pellets were characterized using Raman spectroscopy, Vickers hardness, and impedance spectroscopy, respectively. X-ray diffraction and Rietveld analysis showed that phase purity was only 96{\%}. Moreover, a small fraction of tetragonal phase impurity was observed on the LSCF powders. Impurities significantly affected the phase stability and microstructure of the LSCF–SDC composite cathode. The addition of the SDC electrolyte enhanced the densification of the composite cathode, thereby improving mechanical properties. However, the addition of SDC exerted different effects on the DC electrical conductivity and area-specific resistance (ASR) of the composite cathode. At 800 °C, the ASR value of the LSCF was only 2{\%} that of the LSCF–SDC composite cathode. Overall, the electrical properties of the LSCF–SDC composite cathode are closely related to the crystal structure, purity, and microstructure of LSCF cathode powders. [Figure not available: see fulltext.].",
keywords = "Band gap, Composite cathode, Electrical properties, LSCF, Rotary evaporation",
author = "{Muhammed Ali}, {S. A.} and Mustafa Anwar and Raduwan, {Nor Fatina} and Andanastuti Muchtar and Somalu, {Mahendra Rao}",
year = "2018",
month = "5",
day = "1",
doi = "10.1007/s10971-018-4636-8",
language = "English",
volume = "86",
pages = "493--504",
journal = "Journal of Sol-Gel Science and Technology",
issn = "0928-0707",
publisher = "Springer Netherlands",
number = "2",

}

TY - JOUR

T1 - Optical, mechanical and electrical properties of LSCF–SDC composite cathode prepared by sol–gel assisted rotary evaporation technique

AU - Muhammed Ali, S. A.

AU - Anwar, Mustafa

AU - Raduwan, Nor Fatina

AU - Muchtar, Andanastuti

AU - Somalu, Mahendra Rao

PY - 2018/5/1

Y1 - 2018/5/1

N2 - La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) is a perovskite-type oxide that exhibits excellent mixed ionic–electronic conducting properties and is a suitable cathode material for intermediate temperature solid oxide fuel cells. This study investigates the microstructural, optical, mechanical, and electrical properties of an LSCF–samarium-doped ceria (SDC) composite cathode. LSCF–SDC composite cathode powders were prepared by mixing 50 wt% SDC electrolyte with LSCF cathode powders obtained by the rotary evaporation technique. The band gap of the prepared powders was determined via diffuse reflectance UV–visible spectroscopy. The chemical composition, mechanical properties, and electrochemical properties of the sintered pellets were characterized using Raman spectroscopy, Vickers hardness, and impedance spectroscopy, respectively. X-ray diffraction and Rietveld analysis showed that phase purity was only 96%. Moreover, a small fraction of tetragonal phase impurity was observed on the LSCF powders. Impurities significantly affected the phase stability and microstructure of the LSCF–SDC composite cathode. The addition of the SDC electrolyte enhanced the densification of the composite cathode, thereby improving mechanical properties. However, the addition of SDC exerted different effects on the DC electrical conductivity and area-specific resistance (ASR) of the composite cathode. At 800 °C, the ASR value of the LSCF was only 2% that of the LSCF–SDC composite cathode. Overall, the electrical properties of the LSCF–SDC composite cathode are closely related to the crystal structure, purity, and microstructure of LSCF cathode powders. [Figure not available: see fulltext.].

AB - La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) is a perovskite-type oxide that exhibits excellent mixed ionic–electronic conducting properties and is a suitable cathode material for intermediate temperature solid oxide fuel cells. This study investigates the microstructural, optical, mechanical, and electrical properties of an LSCF–samarium-doped ceria (SDC) composite cathode. LSCF–SDC composite cathode powders were prepared by mixing 50 wt% SDC electrolyte with LSCF cathode powders obtained by the rotary evaporation technique. The band gap of the prepared powders was determined via diffuse reflectance UV–visible spectroscopy. The chemical composition, mechanical properties, and electrochemical properties of the sintered pellets were characterized using Raman spectroscopy, Vickers hardness, and impedance spectroscopy, respectively. X-ray diffraction and Rietveld analysis showed that phase purity was only 96%. Moreover, a small fraction of tetragonal phase impurity was observed on the LSCF powders. Impurities significantly affected the phase stability and microstructure of the LSCF–SDC composite cathode. The addition of the SDC electrolyte enhanced the densification of the composite cathode, thereby improving mechanical properties. However, the addition of SDC exerted different effects on the DC electrical conductivity and area-specific resistance (ASR) of the composite cathode. At 800 °C, the ASR value of the LSCF was only 2% that of the LSCF–SDC composite cathode. Overall, the electrical properties of the LSCF–SDC composite cathode are closely related to the crystal structure, purity, and microstructure of LSCF cathode powders. [Figure not available: see fulltext.].

KW - Band gap

KW - Composite cathode

KW - Electrical properties

KW - LSCF

KW - Rotary evaporation

UR - http://www.scopus.com/inward/record.url?scp=85044347345&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85044347345&partnerID=8YFLogxK

U2 - 10.1007/s10971-018-4636-8

DO - 10.1007/s10971-018-4636-8

M3 - Article

AN - SCOPUS:85044347345

VL - 86

SP - 493

EP - 504

JO - Journal of Sol-Gel Science and Technology

JF - Journal of Sol-Gel Science and Technology

SN - 0928-0707

IS - 2

ER -