Porous ceramics based on yttrium and scandium-cerium doped ZrO2 with fluorite structure: Impact of chromium on conductivity

Xiaomei Zhang; Elena Yu Konysheva

doi:10.1016/j.ssi.2018.02.007

Porous ceramics based on yttrium and scandium-cerium doped ZrO₂ with fluorite structure: Impact of chromium on conductivity

Xiaomei Zhang, Elena Yu Konysheva^*

^*Corresponding author for this work

Department of Chemistry and Materials Science

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The total conductivity of the compositions containing Zr_0.89Sс_0.1Ce_0.01О₂ or Zr_0.92Y_0.08О₂ powders and Cr₂O₃ was studied to evaluate a potential impact of the chromium deposition on the surface of electrolyte grains in the porous composite cathode. The compositions were fabricated in the corresponding ratios: (100-х) mol% Zr_0.89Sс_0.1Ce_0.01О₂ - х mol% CrO_1.5 (10Sc1CeSZ-Cr) and (100-х) mol% Zr_0.92Y_0.08О₂ - х mol% CrO_1.5 (8YSZ-Cr) with х = 0.25, 0.5, 1, and 2. Porous ceramic Zr_0.89Sс_0.1Ce_0.01О₂ with 49% relative density exhibits higher conductivity than Zr_0.92Y_0.08О₂. In general, a small addition of chromium decreases the conductivity of Zr_0.89Sс_0.1Ce_0.01О₂ and Zr_0.92Y_0.08О₂, although the values of the conductivity change in a non-linear way, reaching minimum for 10Sc1CeSZ-Cr1 and 8YSZ-Cr0.25 compositions. This is accompanied by the decrease in the activation energy of the conductivity from 1.35 eV to 1.19 eV in the 10Sc1CeSZ-Cr series and from 1.28 eV to 1.19 eV in the 8YSZ-Cr series with the rise in the chromium content. Evolution of the conductivity values is associated with the interstitial incorporation of chromium into the fluorite structure as well as with its segregation on the surface of grains and grain boundaries. Chromium coexists in the multivalent states (Cr³⁺ and Cr⁶⁺) on the surface of grains. Considering a long-term operation of the SOFC system, one could suggest that Zr_0.89Sс_0.1Ce_0.01О₂ will show more promising transport characteristics in the presence of the chromium containing interconnects.

Original language	English
Pages (from-to)	271-277
Number of pages	7
Journal	Solid State Ionics
Volume	319
DOIs	https://doi.org/10.1016/j.ssi.2018.02.007
Publication status	Published - Jun 2018

Keywords

Chromium containing compositions
Conductivity
Porous ceramic
Solid electrolytes

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10.1016/j.ssi.2018.02.007

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@article{acc51701e898448ebf4c4273f02f534b,

title = "Porous ceramics based on yttrium and scandium-cerium doped ZrO2 with fluorite structure: Impact of chromium on conductivity",

abstract = "The total conductivity of the compositions containing Zr0.89Sс0.1Ce0.01О2 or Zr0.92Y0.08О2 powders and Cr2O3 was studied to evaluate a potential impact of the chromium deposition on the surface of electrolyte grains in the porous composite cathode. The compositions were fabricated in the corresponding ratios: (100-х) mol% Zr0.89Sс0.1Ce0.01О2 - х mol% CrO1.5 (10Sc1CeSZ-Cr) and (100-х) mol% Zr0.92Y0.08О2 - х mol% CrO1.5 (8YSZ-Cr) with х = 0.25, 0.5, 1, and 2. Porous ceramic Zr0.89Sс0.1Ce0.01О2 with 49% relative density exhibits higher conductivity than Zr0.92Y0.08О2. In general, a small addition of chromium decreases the conductivity of Zr0.89Sс0.1Ce0.01О2 and Zr0.92Y0.08О2, although the values of the conductivity change in a non-linear way, reaching minimum for 10Sc1CeSZ-Cr1 and 8YSZ-Cr0.25 compositions. This is accompanied by the decrease in the activation energy of the conductivity from 1.35 eV to 1.19 eV in the 10Sc1CeSZ-Cr series and from 1.28 eV to 1.19 eV in the 8YSZ-Cr series with the rise in the chromium content. Evolution of the conductivity values is associated with the interstitial incorporation of chromium into the fluorite structure as well as with its segregation on the surface of grains and grain boundaries. Chromium coexists in the multivalent states (Cr3+ and Cr6+) on the surface of grains. Considering a long-term operation of the SOFC system, one could suggest that Zr0.89Sс0.1Ce0.01О2 will show more promising transport characteristics in the presence of the chromium containing interconnects.",

keywords = "Chromium containing compositions, Conductivity, Porous ceramic, Solid electrolytes",

author = "Xiaomei Zhang and Konysheva, {Elena Yu}",

note = "Funding Information: Authors gratefully acknowledge Mr. Lan Jian Zhuge and Miss Gaimei Wu as well as financial support from the SIP Jinji Lake Double-Hundred Talents Program ( 01414892X/2012-00460 ), Jiangsu Science and Technology Program ( BK20151243 ) and Research Development fund at XJTLU ( RDF-15-23 ). Funding Information: Authors gratefully acknowledge Mr. Lan Jian Zhuge and Miss Gaimei Wu as well as financial support from the SIP Jinji Lake Double-Hundred Talents Program (01414892X/2012-00460), Jiangsu Science and Technology Program (BK20151243) and Research Development fund at XJTLU (RDF-15-23). Publisher Copyright: {\textcopyright} 2018 Elsevier B.V.",

year = "2018",

month = jun,

doi = "10.1016/j.ssi.2018.02.007",

language = "English",

volume = "319",

pages = "271--277",

journal = "Solid State Ionics",

issn = "0167-2738",

}

TY - JOUR

T1 - Porous ceramics based on yttrium and scandium-cerium doped ZrO2 with fluorite structure

T2 - Impact of chromium on conductivity

AU - Zhang, Xiaomei

AU - Konysheva, Elena Yu

N1 - Funding Information: Authors gratefully acknowledge Mr. Lan Jian Zhuge and Miss Gaimei Wu as well as financial support from the SIP Jinji Lake Double-Hundred Talents Program ( 01414892X/2012-00460 ), Jiangsu Science and Technology Program ( BK20151243 ) and Research Development fund at XJTLU ( RDF-15-23 ). Funding Information: Authors gratefully acknowledge Mr. Lan Jian Zhuge and Miss Gaimei Wu as well as financial support from the SIP Jinji Lake Double-Hundred Talents Program (01414892X/2012-00460), Jiangsu Science and Technology Program (BK20151243) and Research Development fund at XJTLU (RDF-15-23). Publisher Copyright: © 2018 Elsevier B.V.

PY - 2018/6

Y1 - 2018/6

N2 - The total conductivity of the compositions containing Zr0.89Sс0.1Ce0.01О2 or Zr0.92Y0.08О2 powders and Cr2O3 was studied to evaluate a potential impact of the chromium deposition on the surface of electrolyte grains in the porous composite cathode. The compositions were fabricated in the corresponding ratios: (100-х) mol% Zr0.89Sс0.1Ce0.01О2 - х mol% CrO1.5 (10Sc1CeSZ-Cr) and (100-х) mol% Zr0.92Y0.08О2 - х mol% CrO1.5 (8YSZ-Cr) with х = 0.25, 0.5, 1, and 2. Porous ceramic Zr0.89Sс0.1Ce0.01О2 with 49% relative density exhibits higher conductivity than Zr0.92Y0.08О2. In general, a small addition of chromium decreases the conductivity of Zr0.89Sс0.1Ce0.01О2 and Zr0.92Y0.08О2, although the values of the conductivity change in a non-linear way, reaching minimum for 10Sc1CeSZ-Cr1 and 8YSZ-Cr0.25 compositions. This is accompanied by the decrease in the activation energy of the conductivity from 1.35 eV to 1.19 eV in the 10Sc1CeSZ-Cr series and from 1.28 eV to 1.19 eV in the 8YSZ-Cr series with the rise in the chromium content. Evolution of the conductivity values is associated with the interstitial incorporation of chromium into the fluorite structure as well as with its segregation on the surface of grains and grain boundaries. Chromium coexists in the multivalent states (Cr3+ and Cr6+) on the surface of grains. Considering a long-term operation of the SOFC system, one could suggest that Zr0.89Sс0.1Ce0.01О2 will show more promising transport characteristics in the presence of the chromium containing interconnects.

AB - The total conductivity of the compositions containing Zr0.89Sс0.1Ce0.01О2 or Zr0.92Y0.08О2 powders and Cr2O3 was studied to evaluate a potential impact of the chromium deposition on the surface of electrolyte grains in the porous composite cathode. The compositions were fabricated in the corresponding ratios: (100-х) mol% Zr0.89Sс0.1Ce0.01О2 - х mol% CrO1.5 (10Sc1CeSZ-Cr) and (100-х) mol% Zr0.92Y0.08О2 - х mol% CrO1.5 (8YSZ-Cr) with х = 0.25, 0.5, 1, and 2. Porous ceramic Zr0.89Sс0.1Ce0.01О2 with 49% relative density exhibits higher conductivity than Zr0.92Y0.08О2. In general, a small addition of chromium decreases the conductivity of Zr0.89Sс0.1Ce0.01О2 and Zr0.92Y0.08О2, although the values of the conductivity change in a non-linear way, reaching minimum for 10Sc1CeSZ-Cr1 and 8YSZ-Cr0.25 compositions. This is accompanied by the decrease in the activation energy of the conductivity from 1.35 eV to 1.19 eV in the 10Sc1CeSZ-Cr series and from 1.28 eV to 1.19 eV in the 8YSZ-Cr series with the rise in the chromium content. Evolution of the conductivity values is associated with the interstitial incorporation of chromium into the fluorite structure as well as with its segregation on the surface of grains and grain boundaries. Chromium coexists in the multivalent states (Cr3+ and Cr6+) on the surface of grains. Considering a long-term operation of the SOFC system, one could suggest that Zr0.89Sс0.1Ce0.01О2 will show more promising transport characteristics in the presence of the chromium containing interconnects.

KW - Chromium containing compositions

KW - Conductivity

KW - Porous ceramic

KW - Solid electrolytes

UR - http://www.scopus.com/inward/record.url?scp=85042322097&partnerID=8YFLogxK

U2 - 10.1016/j.ssi.2018.02.007

DO - 10.1016/j.ssi.2018.02.007

M3 - Article

AN - SCOPUS:85042322097

SN - 0167-2738

VL - 319

SP - 271

EP - 277

JO - Solid State Ionics

JF - Solid State Ionics

ER -

Porous ceramics based on yttrium and scandium-cerium doped ZrO₂ with fluorite structure: Impact of chromium on conductivity

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