Preparation of La0.75Sr0.25Cr0.5Mn0.5O3-δ fine powders by carbonate coprecipitation for solid oxide fuel cells

Sang Bu Ha; Pyeong Seok Cho; Yoon Ho Cho; Dokyol Lee; Jong Heun Lee

doi:10.1016/j.jpowsour.2009.06.078

Preparation of La_0.75Sr_0.25Cr_0.5Mn_0.5O_3-δ fine powders by carbonate coprecipitation for solid oxide fuel cells

Sang Bu Ha, Pyeong Seok Cho, Yoon Ho Cho, Dokyol Lee, Jong Heun Lee

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

18 Citations (Scopus)

Abstract

A range of La_0.75Sr_0.25Cr_0.5Mn_0.5O_3-δ (LSCM) powders is prepared by the carbonate coprecipitation method for use as anodes in solid oxide fuel cells. The supersaturation ratio (R = [(NH₄)₂CO₃]/([La³⁺] + [Sr²⁺] + [Cr³⁺] + [Mn²⁺])) during the coprecipitation determines the relative compositions of La, Sr, Cr, and Mn. The composition of the precursor approaches the stoichiometric one at the supersaturation range of 4 ≤ R ≤ 12.5, whereas Sr and Mn components are deficient at R < 4 and excessive at R = 25. The fine and phase-pure LSCM powders are prepared by heat treatment at very low temperature (1000 °C) at R = 7.5 and 12.5. By contrast, the solid-state reaction requires a higher heat-treatment temperature (1400 °C). The catalytic activity of the LSCM electrodes is enhanced by using carbonate-derived powders to manipulate the electrode microstructures.

Original language	English
Pages (from-to)	124-129
Number of pages	6
Journal	Journal of Power Sources
Volume	195
Issue number	1
DOIs	https://doi.org/10.1016/j.jpowsour.2009.06.078
Publication status	Published - 2010 Jan 1

Bibliographical note

Funding Information:
This work was supported by the Korea Science and Engineering Foundation (KOSEF) NRL program funded by the Korean government (MEST) (No. R0A-2008-000-20032-0) and by the Seoul R&BD Program (CS070157).

Keywords

Carbonate coprecipitation
Lanthanum strontium chromium manganite electrode
Solid oxide fuel cell
Strontium- and magnesium-doped lanthanum gallate

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.2009.06.078

Cite this

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title = "Preparation of La0.75Sr0.25Cr0.5Mn0.5O3-δ fine powders by carbonate coprecipitation for solid oxide fuel cells",

abstract = "A range of La0.75Sr0.25Cr0.5Mn0.5O3-δ (LSCM) powders is prepared by the carbonate coprecipitation method for use as anodes in solid oxide fuel cells. The supersaturation ratio (R = [(NH4)2CO3]/([La3+] + [Sr2+] + [Cr3+] + [Mn2+])) during the coprecipitation determines the relative compositions of La, Sr, Cr, and Mn. The composition of the precursor approaches the stoichiometric one at the supersaturation range of 4 ≤ R ≤ 12.5, whereas Sr and Mn components are deficient at R < 4 and excessive at R = 25. The fine and phase-pure LSCM powders are prepared by heat treatment at very low temperature (1000 °C) at R = 7.5 and 12.5. By contrast, the solid-state reaction requires a higher heat-treatment temperature (1400 °C). The catalytic activity of the LSCM electrodes is enhanced by using carbonate-derived powders to manipulate the electrode microstructures.",

keywords = "Carbonate coprecipitation, Lanthanum strontium chromium manganite electrode, Solid oxide fuel cell, Strontium- and magnesium-doped lanthanum gallate",

author = "Ha, {Sang Bu} and Cho, {Pyeong Seok} and Cho, {Yoon Ho} and Dokyol Lee and Lee, {Jong Heun}",

note = "Funding Information: This work was supported by the Korea Science and Engineering Foundation (KOSEF) NRL program funded by the Korean government (MEST) (No. R0A-2008-000-20032-0) and by the Seoul R&BD Program (CS070157).",

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AU - Ha, Sang Bu

AU - Cho, Pyeong Seok

AU - Cho, Yoon Ho

AU - Lee, Dokyol

AU - Lee, Jong Heun

N1 - Funding Information: This work was supported by the Korea Science and Engineering Foundation (KOSEF) NRL program funded by the Korean government (MEST) (No. R0A-2008-000-20032-0) and by the Seoul R&BD Program (CS070157).

PY - 2010/1/1

Y1 - 2010/1/1

N2 - A range of La0.75Sr0.25Cr0.5Mn0.5O3-δ (LSCM) powders is prepared by the carbonate coprecipitation method for use as anodes in solid oxide fuel cells. The supersaturation ratio (R = [(NH4)2CO3]/([La3+] + [Sr2+] + [Cr3+] + [Mn2+])) during the coprecipitation determines the relative compositions of La, Sr, Cr, and Mn. The composition of the precursor approaches the stoichiometric one at the supersaturation range of 4 ≤ R ≤ 12.5, whereas Sr and Mn components are deficient at R < 4 and excessive at R = 25. The fine and phase-pure LSCM powders are prepared by heat treatment at very low temperature (1000 °C) at R = 7.5 and 12.5. By contrast, the solid-state reaction requires a higher heat-treatment temperature (1400 °C). The catalytic activity of the LSCM electrodes is enhanced by using carbonate-derived powders to manipulate the electrode microstructures.

AB - A range of La0.75Sr0.25Cr0.5Mn0.5O3-δ (LSCM) powders is prepared by the carbonate coprecipitation method for use as anodes in solid oxide fuel cells. The supersaturation ratio (R = [(NH4)2CO3]/([La3+] + [Sr2+] + [Cr3+] + [Mn2+])) during the coprecipitation determines the relative compositions of La, Sr, Cr, and Mn. The composition of the precursor approaches the stoichiometric one at the supersaturation range of 4 ≤ R ≤ 12.5, whereas Sr and Mn components are deficient at R < 4 and excessive at R = 25. The fine and phase-pure LSCM powders are prepared by heat treatment at very low temperature (1000 °C) at R = 7.5 and 12.5. By contrast, the solid-state reaction requires a higher heat-treatment temperature (1400 °C). The catalytic activity of the LSCM electrodes is enhanced by using carbonate-derived powders to manipulate the electrode microstructures.

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KW - Strontium- and magnesium-doped lanthanum gallate

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