Effect of CaO concentration on enhancement of grain-boundary conduction in gadolinia-doped ceria

Pyeong Seok Cho; Sung Bo Lee; Yoon Ho Cho; Doh Yeon Kim; Hyun Min Park; Jong Heun Lee

doi:10.1016/j.jpowsour.2008.05.041

Effect of CaO concentration on enhancement of grain-boundary conduction in gadolinia-doped ceria

Pyeong Seok Cho, Sung Bo Lee, Yoon Ho Cho, Doh Yeon Kim, Hyun Min Park, Jong Heun Lee

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Abstract

This study examines the effect of calcium oxide (CaO) addition to Ce _0.9Gd_0.1O_1.95 (gadolinia-doped ceria, GDC) containing 500 ppm SiO₂ on grain-interior and grain-boundary conduction. The GDC can be used as a solid electrolyte for intermediate and low-temperature solid oxide fuel cells. Doping with ≥2 mol% CaO results in a decrease in apparent grain-boundary resistivity at 300 °C from 746.7 kΩ cm to 2.8-3.5 kΩ cm. The total resistivity exhibits a minimum at 2 mol% CaO. Further increase in CaO concentration to 10 mol% results in an increase in grain-interior resistivity from 3.1 to 40 kΩ cm. Although most of the CaO is incorporated into the GDC lattice, a small amount of CaO scavenges the intergranular siliceous phase, which leads to a significant increase in grain-boundary conduction. The increase in grain-interior resistivity at high CaO concentration is attributed to defect association between V_o and Ca_ce".

Original language	English
Pages (from-to)	518-523
Number of pages	6
Journal	Journal of Power Sources
Volume	183
Issue number	2
DOIs	https://doi.org/10.1016/j.jpowsour.2008.05.041
Publication status	Published - 2008 Sept 1

Keywords

Calcium oxide
Gadolinia-doped ceria (GDC)
Grain-boundary conduction
Scavenging effect
Solid oxide fuel cell

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jpowsour.2008.05.041

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title = "Effect of CaO concentration on enhancement of grain-boundary conduction in gadolinia-doped ceria",

abstract = "This study examines the effect of calcium oxide (CaO) addition to Ce 0.9Gd0.1O1.95 (gadolinia-doped ceria, GDC) containing 500 ppm SiO2 on grain-interior and grain-boundary conduction. The GDC can be used as a solid electrolyte for intermediate and low-temperature solid oxide fuel cells. Doping with ≥2 mol% CaO results in a decrease in apparent grain-boundary resistivity at 300 °C from 746.7 kΩ cm to 2.8-3.5 kΩ cm. The total resistivity exhibits a minimum at 2 mol% CaO. Further increase in CaO concentration to 10 mol% results in an increase in grain-interior resistivity from 3.1 to 40 kΩ cm. Although most of the CaO is incorporated into the GDC lattice, a small amount of CaO scavenges the intergranular siliceous phase, which leads to a significant increase in grain-boundary conduction. The increase in grain-interior resistivity at high CaO concentration is attributed to defect association between Vo and Cace{"}.",

keywords = "Calcium oxide, Gadolinia-doped ceria (GDC), Grain-boundary conduction, Scavenging effect, Solid oxide fuel cell",

author = "Cho, {Pyeong Seok} and Lee, {Sung Bo} and Cho, {Yoon Ho} and Kim, {Doh Yeon} and Park, {Hyun Min} and Lee, {Jong Heun}",

year = "2008",

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doi = "10.1016/j.jpowsour.2008.05.041",

language = "English",

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journal = "Journal of Power Sources",

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TY - JOUR

T1 - Effect of CaO concentration on enhancement of grain-boundary conduction in gadolinia-doped ceria

AU - Cho, Pyeong Seok

AU - Lee, Sung Bo

AU - Cho, Yoon Ho

AU - Kim, Doh Yeon

AU - Park, Hyun Min

AU - Lee, Jong Heun

PY - 2008/9/1

Y1 - 2008/9/1

N2 - This study examines the effect of calcium oxide (CaO) addition to Ce 0.9Gd0.1O1.95 (gadolinia-doped ceria, GDC) containing 500 ppm SiO2 on grain-interior and grain-boundary conduction. The GDC can be used as a solid electrolyte for intermediate and low-temperature solid oxide fuel cells. Doping with ≥2 mol% CaO results in a decrease in apparent grain-boundary resistivity at 300 °C from 746.7 kΩ cm to 2.8-3.5 kΩ cm. The total resistivity exhibits a minimum at 2 mol% CaO. Further increase in CaO concentration to 10 mol% results in an increase in grain-interior resistivity from 3.1 to 40 kΩ cm. Although most of the CaO is incorporated into the GDC lattice, a small amount of CaO scavenges the intergranular siliceous phase, which leads to a significant increase in grain-boundary conduction. The increase in grain-interior resistivity at high CaO concentration is attributed to defect association between Vo and Cace".

AB - This study examines the effect of calcium oxide (CaO) addition to Ce 0.9Gd0.1O1.95 (gadolinia-doped ceria, GDC) containing 500 ppm SiO2 on grain-interior and grain-boundary conduction. The GDC can be used as a solid electrolyte for intermediate and low-temperature solid oxide fuel cells. Doping with ≥2 mol% CaO results in a decrease in apparent grain-boundary resistivity at 300 °C from 746.7 kΩ cm to 2.8-3.5 kΩ cm. The total resistivity exhibits a minimum at 2 mol% CaO. Further increase in CaO concentration to 10 mol% results in an increase in grain-interior resistivity from 3.1 to 40 kΩ cm. Although most of the CaO is incorporated into the GDC lattice, a small amount of CaO scavenges the intergranular siliceous phase, which leads to a significant increase in grain-boundary conduction. The increase in grain-interior resistivity at high CaO concentration is attributed to defect association between Vo and Cace".

KW - Calcium oxide

KW - Gadolinia-doped ceria (GDC)

KW - Grain-boundary conduction

KW - Scavenging effect

KW - Solid oxide fuel cell

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Effect of CaO concentration on enhancement of grain-boundary conduction in gadolinia-doped ceria

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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